The Saginaw Bay walleye population (Sander vitreus) has not fully recovered from a collapse that began in the 1940s and has been dependent on stocking with only limited natural reproduction. Beginning in 2003, and through at least 2005, reproductive success of walleye surged to unprecedented levels. The increase was concurrent with ecological changes in Lake Huron and we sought to quantitatively model which factors most influenced this new dynamic. We developed Ricker stock-recruitment models for both wild and stock fish and evaluated them with second-order Akaike's information criterion to find the best model. Independent variables included adult alewife (Alosa pseudoharengus) abundance, spring water temperatures, chlorophyll a levels and total phosphorus levels. In all, 14 models were evaluated for production of wild age-0 walleyes and eight models for stocked age-0 walleyes. For wild walleyes, adult alewife abundance was the dominant factor, accounting for 58% of the variability in age-0 abundance. Production of wild age-0 fish increased when adult alewives were scarce. The only other plausible factor was spring water temperature. Predictably, alewife abundance was not important to stocked fish; instead temperature and adult walleye abundance were more significant variables. The surge in reproductive success for walleyes during 2003–2005 was most likely due to large declines in adult alewives in Lake Huron. While relatively strong year classes (age-1 and up) have been produced as a result of increased age-0 production during 2003–2005, the overall magnitude has not been as great as the initial age-0 abundance originally suggested. It appears that over-winter mortality is higher than in the past and may stem from higher predation or slower growth (lower condition for enduring winter thermal stress). From this it appears that low alewife abundance does not assure strong walleye year classes in Saginaw Bay but may be a prerequisite for them.
","language":"English","publisher":"International Association for Great Lakes Research","doi":"10.3394/0380-1330(2007)33[118:EAECST]2.0.CO;2","issn":"03801330","usgsCitation":"Fielder, D., Schaeffer, J., and Thomas, M., 2007, Environmental and ecological conditions surrounding the production of large year classes of walleye (Sander vitreus) in Saginaw Bay, Lake Huron: Journal of Great Lakes Research, v. 33, no. Supplement 1, p. 118-132, https://doi.org/10.3394/0380-1330(2007)33[118:EAECST]2.0.CO;2.","productDescription":"15 p.","startPage":"118","endPage":"132","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"links":[{"id":240404,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":212850,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.3394/0380-1330(2007)33[118:EAECST]2.0.CO;2"}],"volume":"33","issue":"Supplement 1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a099be4b0c8380cd51fb4","contributors":{"authors":[{"text":"Fielder, D.G.","contributorId":22152,"corporation":false,"usgs":true,"family":"Fielder","given":"D.G.","email":"","affiliations":[],"preferred":false,"id":425740,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Schaeffer, J.S.","contributorId":42688,"corporation":false,"usgs":true,"family":"Schaeffer","given":"J.S.","email":"","affiliations":[],"preferred":false,"id":425741,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Thomas, M.V.","contributorId":66908,"corporation":false,"usgs":true,"family":"Thomas","given":"M.V.","email":"","affiliations":[],"preferred":false,"id":425742,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70030110,"text":"70030110 - 2007 - Suspended sediment transport in an ephemeral stream following wildfire","interactions":[],"lastModifiedDate":"2023-08-03T11:40:18.33254","indexId":"70030110","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2318,"text":"Journal of Geophysical Research F: Earth Surface","active":true,"publicationSubtype":{"id":10}},"title":"Suspended sediment transport in an ephemeral stream following wildfire","docAbstract":"We examine the impacts of a stand-clearing wildfire on the characteristics and magnitude of suspended sediment transport in ephemeral streams draining the burn area. We report the results of a monitoring program that includes 2 years of data prior to the Cerro Grande fire in New Mexico, and 3 years of postfire data. Suspended sediment concentration (SSC) increased by about 2 orders of magnitude following the fire, and the proportion of silt and clay increased from 50% to 80%. For a given flow event, SSC is highest at the flood bore and decreases monotonically with time, a pattern evident in every flood sampled both before and after the fire. We propose that the accumulation of flow and wash load at the flow front is an inherent characteristic of ephemeral stream flows, due to amplified momentum losses at the flood bore. We present a new model for computing suspended sediment transport in ephemeral streams (in the presence or absence of wildfire) by relating SSC to the time following the arrival of the flood bore, rather than to instantaneous discharge. Using this model and a rainfall history, we estimate that in the 3 years following the fire, floods transported in suspension a mass equivalent to about 3 mm of landscape lowering across the burn area, 20% of this following a single rainstorm. We test the model by computing fine sediment delivery to a small reservoir in an adjacent watershed, where we have a detailed record of postfire sedimentation based on repeat surveys. Systematic discrepancies between modeled and measured sedimentation rates in the reservoir suggest rapid reductions in suspended sediment delivery in the first several years after the fire.
[1] A seismic reflection and refraction survey across the San Andreas Fault (SAF) near Parkfield provides a detailed characterization of crustal structure across the location of the San Andreas Fault Observatory at Depth (SAFOD). Steep-dip prestack migration and frequency domain acoustic waveform tomography were applied to obtain highly resolved images of the upper 5 km of the crust for 15 km on either side of the SAF. The resulting velocity model constrains the top of the Salinian granite with great detail. Steep-dip reflection seismic images show several strong-amplitude vertical reflectors in the uppermost crust near SAFOD that define an ∼2-km-wide zone comprising the main SAF and two or more local faults. Another prominent subvertical reflector at 2–4 km depth ∼9 km to the northeast of the SAF marks the boundary between the Franciscan terrane and the Great Valley Sequence. A deep seismic section of low resolution shows several reflectors in the Salinian crust west of the SAF. Two horizontal reflectors around 10 km depth correlate with strains of seismicity observed along-strike of the SAF. They represent midcrustal shear zones partially decoupling the ductile lower crust from the brittle upper crust. The deepest reflections from ∼25 km depth are interpreted as crust-mantle boundary.
[1] Using a digital video-based Argus Beach Monitoring System (ABMS) on the north shore of Kachemak Bay in south central Alaska, we document the timing and magnitude of alongshore migration of intertidal sand bed forms over a cobble substrate during a 22-month observation period. Two separate sediment packages (sand bodies) of 1–2 m amplitude and ∼200 m wavelength, consisting of well-sorted sand, were observed to travel along shore at annually averaged rates of 278 m/yr (0.76 m/d) and 250 m/yr (0.68 m/d), respectively. Strong seasonality in migration rates was shown by the contrast of rapid winter and slow summer transport. Though set in a megatidal environment, data indicate that sand body migration is driven by eastward propagating wind waves as opposed to net westward directed tidal currents. Greatest weekly averaged rates of movement, exceeding 6 m/d, coincided with wave heights exceeding 2 m suggesting a correlation of wave height and sand body migration. Because Kachemak Bay is partially enclosed, waves responsible for sediment entrainment and transport are locally generated by winds that blow across lower Cook Inlet from the southwest, the direction of greatest fetch. Our estimates of sand body migration translate to a littoral transport rate between 4,400–6,300 m3/yr. Assuming an enclosed littoral cell, minimal riverine sediment contributions, and a sea cliff sedimentary fraction of 0.05, we estimate long-term local sea cliff retreat rates of 9–14 cm/yr. Applying a numerical model of wave energy dissipation to the temporally variable beach morphology suggests that sand bodies are responsible for enhancing wave energy dissipation by ∼13% offering protection from sea cliff retreat.
A new approach has been developed for solving solute transport problems in randomly heterogeneous media using the Karhunen‐Loève‐based moment equation (KLME) technique proposed by Zhang and Lu (2004). The KLME approach combines the Karhunen‐Loève decomposition of the underlying random conductivity field and the perturbative and polynomial expansions of dependent variables including the hydraulic head, flow velocity, dispersion coefficient, and solute concentration. The equations obtained in this approach are sequential, and their structure is formulated in the same form as the original governing equations such that any existing simulator, such as Modular Three‐Dimensional Multispecies Transport Model for Simulation of Advection, Dispersion, and Chemical Reactions of Contaminants in Groundwater Systems (MT3DMS), can be directly applied as the solver. Through a series of two‐dimensional examples, the validity of the KLME approach is evaluated against the classical Monte Carlo simulations. Results indicate that under the flow and transport conditions examined in this work, the KLME approach provides an accurate representation of the mean concentration. For the concentration variance, the accuracy of the KLME approach is good when the conductivity variance is 0.5. As the conductivity variance increases up to 1.0, the mismatch on the concentration variance becomes large, although the mean concentration can still be accurately reproduced by the KLME approach. Our results also indicate that when the conductivity variance is relatively large, neglecting the effects of the cross terms between velocity fluctuations and local dispersivities, as done in some previous studies, can produce noticeable errors, and a rigorous treatment of the dispersion terms becomes more appropriate.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/2006WR005193","usgsCitation":"Liu, G., Lu, Z., and Zhang, D., 2007, Stochastic uncertainty analysis for solute transport in randomly heterogeneous media using a Karhunen‐Loève‐based moment equation approach: Water Resources Research, v. 43, no. 7, Article W07427; 15 p., https://doi.org/10.1029/2006WR005193.","productDescription":"Article W07427; 15 p.","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":477023,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2006wr005193","text":"Publisher Index Page"},{"id":240630,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"43","issue":"7","noUsgsAuthors":false,"publicationDate":"2007-07-18","publicationStatus":"PW","scienceBaseUri":"505b9853e4b08c986b31bf99","contributors":{"authors":[{"text":"Liu, Gaisheng","contributorId":15158,"corporation":false,"usgs":true,"family":"Liu","given":"Gaisheng","email":"","affiliations":[],"preferred":false,"id":425666,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Lu, Zhiming","contributorId":174148,"corporation":false,"usgs":false,"family":"Lu","given":"Zhiming","email":"","affiliations":[],"preferred":false,"id":425668,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Zhang, Dongxiao","contributorId":26409,"corporation":false,"usgs":true,"family":"Zhang","given":"Dongxiao","email":"","affiliations":[],"preferred":false,"id":425667,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70194942,"text":"70194942 - 2007 - Integrated ground-water monitoring strategy for NRC-licensed facilities and sites: Case study applications","interactions":[],"lastModifiedDate":"2020-01-26T10:58:50","indexId":"70194942","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":1,"text":"Federal Government Series"},"seriesNumber":"NUREG/CR-6948, Vol. 2","title":"Integrated ground-water monitoring strategy for NRC-licensed facilities and sites: Case study applications","docAbstract":"This document discusses results of applying the Integrated Ground-Water Monitoring Strategy (the Strategy) to actual waste sites using existing field characterization and monitoring data. The Strategy is a systematic approach to dealing with complex sites. Application of such a systematic approach will reduce uncertainty associated with site analysis, and therefore uncertainty associated with management decisions about a site. The Strategy can be used to guide the development of a ground-water monitoring program or to review an existing one. The sites selected for study fall within a wide range of geologic and climatic settings, waste compositions, and site design characteristics and represent realistic cases that might be encountered by the NRC. No one case study illustrates a comprehensive application of the Strategy using all available site data. Rather, within each case study we focus on certain aspects of the Strategy, to illustrate concepts that can be applied generically to all sites. The test sites selected include:
A Data Analysis section provides examples of detailed data analysis of monitoring data.
Aquatic insects often dominate lotic ecosystems, yet these organisms are under-represented in trace metal toxicity databases. Furthermore, toxicity data for aquatic insects do not appear to reflect their actual sensitivities to metals in nature, because the concentrations required to elicit toxicity in the laboratory are considerably higher than those found to impact insect communities in the field. New approaches are therefore needed to better understand how and why insects are differentially susceptible to metal exposures. Biodynamic modeling is a powerful tool for understanding interspecific differences in trace metal bioaccumulation. Because bioaccumulation alone does not necessarily correlate with toxicity, we combined biokinetic parameters associated with dissolved cadmium exposures with studies of the subcellular compartmentalization of accumulated Cd. This combination of physiological traits allowed us to make predictions of susceptibility differences to dissolved Cd in three aquatic insect taxa: Ephemerella excrucians, Rhithrogena morrisoni, and Rhyacophila sp. We compared these predictions with long-term field monitoring data and toxicity tests with closely related taxa: Ephemerella infrequens, Rhithrogena hageni, and Rhyacophila brunea. Kinetic parameters allowed us to estimate steady-state concentrations, the time required to reach steady state, and the concentrations of Cd projected to be in potentially toxic compartments for different species. Species-specific physiological traits identified using biodynamic models provided a means for better understanding why toxicity assays with insects have failed to provide meaningful estimates for metal concentrations that would be expected to be protective in nature.
This report presents a review of the U.S. Geological Survey (USGS) 2007 assessment of the undiscovered oil and gas resources in Paleogene strata underlying the U.S. Gulf of Mexico Coastal Plain and state waters. Geochemical, geologic, geophysical, thermal maturation, burial history, and paleontologic studies have been combined with regional cross sections and data from previous USGS petroleum assessments have helped to define the major petroleum systems and assessment units. Accumulations of both conventional oil and gas and continuous coal-bed gas within these petroleum systems have been digitally mapped and evaluated, and undiscovered resources have been assessed following USGS methodology.
The primary source intervals for oil and gas in Paleogene (and Cenozoic) reservoirs are coal and shale rich in organic matter within the Wilcox Group (Paleocene-Eocene) and Sparta Formation of the Claiborne Group (Eocene); in addition, Cretaceous and Jurassic source rocks probably have contributed substantial petroleum to Paleogene (and Cenozoic) reservoirs.
For the purposes of the assessment, Paleogene strata have divided into the following four stratigraphic study intervals: (1) Wilcox Group (including the Midway Group and the basal Carrizo Sand of the Claiborne Group; Paleocene-Eocene); (2) Claiborne Group (Eocene); (3) Jackson and Vicksburg Groups (Eocene-Oligocene); and (4) the Frio-Anahuac Formations (Oligocene). Recent discoveries of coal-bed gas in Paleocene strata confirm a new petroleum system that was not recognized in previous USGS assessments. In total, 26 conventional Paleogene assessment units are defined. In addition, four Cretaceous-Paleogene continuous (coal-bed gas) assessment units are included in this report. Initial results of the assessment will be released as USGS Fact Sheets (not available at the time of this writing).
Comprehensive reports for each assessment unit are planned to be released via the internet and distributed on CD-ROMs within the next year.
","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"The Paleogene of the Gulf of Mexico and Caribbean basins: Processes, events, and petroleum systems","largerWorkSubtype":{"id":12,"text":"Conference publication"},"conferenceTitle":"27th Annual Gulf Coast Section SEPM Foundation Bob F. Perkins Research Conference","conferenceDate":"December 2-5, 2007","conferenceLocation":"Houston, TX","language":"English","publisher":"SEPM Society for Sedimentary Geology","doi":"10.5724/gcs.07.27.0002","isbn":"978-0-9836096-3-6","usgsCitation":"Warwick, P.D., Coleman, J.L., Hackley, P.C., Hayba, D.O., Karlsen, A.W., Rowan, E.L., and Swanson, S.M., 2007, USGS assessment of undiscovered oil and gas resources in Paleogene strata of the U.S. Gulf of Mexico coastal plain and state waters, in The Paleogene of the Gulf of Mexico and Caribbean basins: Processes, events, and petroleum systems, v. 27, Houston, TX, December 2-5, 2007, p. 2-44, https://doi.org/10.5724/gcs.07.27.0002.","productDescription":"43 p.","startPage":"2","endPage":"44","ipdsId":"IP-006895","costCenters":[{"id":241,"text":"Eastern Energy Resources Science Center","active":true,"usgs":true},{"id":245,"text":"Eastern Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"links":[{"id":351049,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"U.S. Gulf Coast","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -99.052734375,\n 24.327076540018634\n ],\n [\n -79.541015625,\n 24.327076540018634\n ],\n [\n -79.541015625,\n 33.797408767572485\n ],\n [\n -99.052734375,\n 33.797408767572485\n ],\n [\n -99.052734375,\n 24.327076540018634\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"27","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5a7acd20e4b00f54eb20c594","contributors":{"editors":[{"text":"Kennan, Lorcan","contributorId":102036,"corporation":false,"usgs":false,"family":"Kennan","given":"Lorcan","email":"","affiliations":[],"preferred":false,"id":726761,"contributorType":{"id":2,"text":"Editors"},"rank":1},{"text":"Pindell, James","contributorId":86137,"corporation":false,"usgs":false,"family":"Pindell","given":"James","email":"","affiliations":[],"preferred":false,"id":726762,"contributorType":{"id":2,"text":"Editors"},"rank":2},{"text":"Rosen, Norman C.","contributorId":40565,"corporation":false,"usgs":false,"family":"Rosen","given":"Norman","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":726770,"contributorType":{"id":2,"text":"Editors"},"rank":3}],"authors":[{"text":"Warwick, Peter D. 0000-0002-3152-7783 pwarwick@usgs.gov","orcid":"https://orcid.org/0000-0002-3152-7783","contributorId":762,"corporation":false,"usgs":true,"family":"Warwick","given":"Peter","email":"pwarwick@usgs.gov","middleInitial":"D.","affiliations":[{"id":241,"text":"Eastern Energy Resources Science Center","active":true,"usgs":true}],"preferred":false,"id":726763,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Coleman, James L. jlcoleman@usgs.gov","contributorId":141060,"corporation":false,"usgs":true,"family":"Coleman","given":"James","email":"jlcoleman@usgs.gov","middleInitial":"L.","affiliations":[{"id":241,"text":"Eastern Energy Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":726764,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hackley, Paul C. 0000-0002-5957-2551 phackley@usgs.gov","orcid":"https://orcid.org/0000-0002-5957-2551","contributorId":592,"corporation":false,"usgs":true,"family":"Hackley","given":"Paul","email":"phackley@usgs.gov","middleInitial":"C.","affiliations":[{"id":241,"text":"Eastern Energy Resources Science Center","active":true,"usgs":true},{"id":255,"text":"Energy Resources Program","active":true,"usgs":true}],"preferred":true,"id":726765,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Hayba, Daniel O. 0000-0003-4092-1894 dhayba@usgs.gov","orcid":"https://orcid.org/0000-0003-4092-1894","contributorId":396,"corporation":false,"usgs":true,"family":"Hayba","given":"Daniel","email":"dhayba@usgs.gov","middleInitial":"O.","affiliations":[],"preferred":true,"id":726766,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Karlsen, Alexander W.","contributorId":105382,"corporation":false,"usgs":true,"family":"Karlsen","given":"Alexander","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":726767,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Rowan, Elisabeth L. 0000-0001-5753-6189 erowan@usgs.gov","orcid":"https://orcid.org/0000-0001-5753-6189","contributorId":2075,"corporation":false,"usgs":true,"family":"Rowan","given":"Elisabeth","email":"erowan@usgs.gov","middleInitial":"L.","affiliations":[{"id":241,"text":"Eastern Energy Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":726768,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Swanson, Sharon M. 0000-0002-4235-1736 smswanson@usgs.gov","orcid":"https://orcid.org/0000-0002-4235-1736","contributorId":590,"corporation":false,"usgs":true,"family":"Swanson","given":"Sharon","email":"smswanson@usgs.gov","middleInitial":"M.","affiliations":[{"id":241,"text":"Eastern Energy Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":726769,"contributorType":{"id":1,"text":"Authors"},"rank":7}]}} ,{"id":70029928,"text":"70029928 - 2007 - Anthropogenic contaminants as tracers in an urbanizing karst aquifer","interactions":[],"lastModifiedDate":"2012-03-12T17:21:35","indexId":"70029928","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2233,"text":"Journal of Contaminant Hydrology","active":true,"publicationSubtype":{"id":10}},"title":"Anthropogenic contaminants as tracers in an urbanizing karst aquifer","docAbstract":"Karst aquifers are uniquely vulnerable to contamination. In the Barton Springs segment of the karstic Edwards aquifer (Texas, U.S.A.), urban contaminants such as pesticides and volatile organic compounds frequently are detected in spring base flow. To determine whether contaminant concentrations change in response to storms, and if they therefore might act as tracers of focused recharge, samples were collected from Barton Springs at closely spaced intervals following three storms. Two herbicides (atrazine and simazine), two insecticides (carbaryl and diazinon), and a solvent (tetrachloroethene) described breakthrough curves over a 1-week period following one or more storms. The breakthrough curves were decomposed into two to five log-normal subcurves, which were interpreted as representing pulses of contaminants moving through the aquifer. Each subcurve could be used in the same way as an artificial tracer to determine travel time to and recovery at the spring. The contaminants have several advantages over artificial tracers: they represent the actual compounds of interest, they are injected essentially simultaneously at several points, and they are injected under those conditions when transport is of the most interest, i.e., following storms. The response of storm discharge, specific conductance, and contaminant loading at the spring depended on initial aquifer flow conditions, which varied from very low (spring discharge of 0.48??m3/s) to high (spring discharge of 2.7??m3/s): concentrations and recovery were the highest when initial aquifer flow conditions were low. This behavior provides information about aquifer structure and the influence of aquifer flow condition on transport properties. ?? 2006 Elsevier B.V. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Contaminant Hydrology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.jconhyd.2006.08.010","issn":"01697722","usgsCitation":"Mahler, B., and Massei, N., 2007, Anthropogenic contaminants as tracers in an urbanizing karst aquifer: Journal of Contaminant Hydrology, v. 91, no. 1-2, p. 81-106, https://doi.org/10.1016/j.jconhyd.2006.08.010.","startPage":"81","endPage":"106","numberOfPages":"26","costCenters":[],"links":[{"id":213095,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.jconhyd.2006.08.010"},{"id":240684,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"91","issue":"1-2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059ec58e4b0c8380cd491ed","contributors":{"authors":[{"text":"Mahler, B.","contributorId":32737,"corporation":false,"usgs":true,"family":"Mahler","given":"B.","email":"","affiliations":[],"preferred":false,"id":424941,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Massei, N.","contributorId":48347,"corporation":false,"usgs":true,"family":"Massei","given":"N.","email":"","affiliations":[],"preferred":false,"id":424942,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70029953,"text":"70029953 - 2007 - Source parameters of a M4.8 and its accompanying repeating earthquakes off Kamaishi, NE Japan: Implications for the hierarchical structure of asperities and earthquake cycle","interactions":[],"lastModifiedDate":"2012-03-12T17:21:07","indexId":"70029953","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1807,"text":"Geophysical Research Letters","active":true,"publicationSubtype":{"id":10}},"title":"Source parameters of a M4.8 and its accompanying repeating earthquakes off Kamaishi, NE Japan: Implications for the hierarchical structure of asperities and earthquake cycle","docAbstract":"We determine the source parameters of a M4.9 ?? 0.1 'characteristic earthquake' sequence and its accompanying microearthquakes at ???50 km depth on the subduction plate boundary offshore of Kamaishi, NE Japan. The microearthquakes tend to occur more frequently in the latter half of the recurrence intervals of the M4.9 ?? 0.1 events. Our results show that the microearthquakes are repeating events and they are located not only around but also within the slip area for the 2001 M4.8 event. From the hierarchical structure of slip areas and smaller stress drops for the microearthquakes compared to the M4.8 event, we infer the small repeating earthquakes rupture relatively weak patches in and around the slip area for the M4.8 event and their activity reflects a stress concentration process and/or change in frictional property (healing) at the area. We also infer the patches for the M4.9 ?? 0.1 and other repeating earthquakes undergo aseismic slip during their interseismic period. Copyright 2007 by the American Geophysical Union.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Geophysical Research Letters","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1029/2007GL031263","issn":"00948276","usgsCitation":"Uchida, N., Matsuzawa, T., Ellsworth, W., Imanishi, K., Okada, T., and Hasegawa, A., 2007, Source parameters of a M4.8 and its accompanying repeating earthquakes off Kamaishi, NE Japan: Implications for the hierarchical structure of asperities and earthquake cycle: Geophysical Research Letters, v. 34, no. 20, https://doi.org/10.1029/2007GL031263.","costCenters":[],"links":[{"id":477217,"rank":10000,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2007gl031263","text":"Publisher Index Page"},{"id":213008,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1029/2007GL031263"},{"id":240588,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"34","issue":"20","noUsgsAuthors":false,"publicationDate":"2007-10-31","publicationStatus":"PW","scienceBaseUri":"505b9338e4b08c986b31a38f","contributors":{"authors":[{"text":"Uchida, N.","contributorId":101088,"corporation":false,"usgs":true,"family":"Uchida","given":"N.","email":"","affiliations":[],"preferred":false,"id":425049,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Matsuzawa, T.","contributorId":11804,"corporation":false,"usgs":true,"family":"Matsuzawa","given":"T.","affiliations":[],"preferred":false,"id":425046,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Ellsworth, W.L.","contributorId":48541,"corporation":false,"usgs":true,"family":"Ellsworth","given":"W.L.","email":"","affiliations":[],"preferred":false,"id":425047,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Imanishi, K.","contributorId":51956,"corporation":false,"usgs":true,"family":"Imanishi","given":"K.","affiliations":[],"preferred":false,"id":425048,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Okada, T.","contributorId":10626,"corporation":false,"usgs":true,"family":"Okada","given":"T.","email":"","affiliations":[],"preferred":false,"id":425045,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Hasegawa, A.","contributorId":6264,"corporation":false,"usgs":true,"family":"Hasegawa","given":"A.","email":"","affiliations":[],"preferred":false,"id":425044,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70029930,"text":"70029930 - 2007 - Quantifying tolerance indicator values for common stream fish species of the United States","interactions":[],"lastModifiedDate":"2012-03-12T17:21:09","indexId":"70029930","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1456,"text":"Ecological Indicators","active":true,"publicationSubtype":{"id":10}},"title":"Quantifying tolerance indicator values for common stream fish species of the United States","docAbstract":"The classification of fish species tolerance to environmental disturbance is often used as a means to assess ecosystem conditions. Its use, however, may be problematic because the approach to tolerance classification is based on subjective judgment. We analyzed fish and physicochemical data from 773 stream sites collected as part of the U.S. Geological Survey's National Water-Quality Assessment Program to calculate tolerance indicator values for 10 physicochemical variables using weighted averaging. Tolerance indicator values (TIVs) for ammonia, chloride, dissolved oxygen, nitrite plus nitrate, pH, phosphorus, specific conductance, sulfate, suspended sediment, and water temperature were calculated for 105 common fish species of the United States. Tolerance indicator values for specific conductance and sulfate were correlated (rho = 0.87), and thus, fish species may be co-tolerant to these water-quality variables. We integrated TIVs for each species into an overall tolerance classification for comparisons with judgment-based tolerance classifications. Principal components analysis indicated that the distinction between tolerant and intolerant classifications was determined largely by tolerance to suspended sediment, specific conductance, chloride, and total phosphorus. Factors such as water temperature, dissolved oxygen, and pH may not be as important in distinguishing between tolerant and intolerant classifications, but may help to segregate species classified as moderate. Empirically derived tolerance classifications were 58.8% in agreement with judgment-derived tolerance classifications. Canonical discriminant analysis revealed that few TIVs, primarily chloride, could discriminate among judgment-derived tolerance classifications of tolerant, moderate, and intolerant. To our knowledge, this is the first empirically based understanding of fish species tolerance for stream fishes in the United States.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Ecological Indicators","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.ecolind.2006.02.004","issn":"1470160X","usgsCitation":"Meador, M.R., and Carlisle, D., 2007, Quantifying tolerance indicator values for common stream fish species of the United States: Ecological Indicators, v. 7, no. 2, p. 329-338, https://doi.org/10.1016/j.ecolind.2006.02.004.","startPage":"329","endPage":"338","numberOfPages":"10","costCenters":[],"links":[{"id":212660,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.ecolind.2006.02.004"},{"id":240182,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"7","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a91efe4b0c8380cd80559","contributors":{"authors":[{"text":"Meador, M. R.","contributorId":74400,"corporation":false,"usgs":true,"family":"Meador","given":"M.","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":424950,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Carlisle, D.M.","contributorId":81059,"corporation":false,"usgs":true,"family":"Carlisle","given":"D.M.","email":"","affiliations":[],"preferred":false,"id":424951,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70029952,"text":"70029952 - 2007 - Wave field features of shallow vertical discontinuity and their application in non-destructive detection","interactions":[],"lastModifiedDate":"2012-03-12T17:21:07","indexId":"70029952","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2165,"text":"Journal of Applied Geophysics","active":true,"publicationSubtype":{"id":10}},"title":"Wave field features of shallow vertical discontinuity and their application in non-destructive detection","docAbstract":"The geotechnical integrity of critical infrastructure can be seriously compromised by the presence of fractures or crevices. Non-destructive techniques to accurately detect fractures in critical infrastructure such as dams and highways could be of significant benefit to the geotechnical industry. This paper investigates the application of shallow seismic and georadar methods to the detection of a vertical discontinuity using numerical simulations. The objective is to address the kinematical analysis of a vertical discontinuity, determine the resulting wave field characteristics, and provide the basis for determining the existence of vertical discontinuities based on the recorded signals. Simulation results demonstrate that: (1) A reflection from a vertical discontinuity produces a hyperbolic feature on a seismic or georadar profile; (2) In order for a reflection from a vertical discontinuity to be produced, a reflecting horizon below the discontinuity must exist, the offset between source and receiver (x0) must be non-zero, on the same side of the vertical discontinuity; (3) The range of distances from the vertical discontinuity where a reflection event is observed is proportional to its length and to x0; (4) Should the vertical crevice (or fracture) pass through a reflecting horizon, dual hyperbolic features can be observed on the records, and this can be used as a determining factor that the vertical crevice passes through the interface; and (5) diffractions from the edges of the discontinuity can be recorded with relatively smaller amplitude than reflections and their ranges are not constrained by the length of discontinuity. If the length of discontinuity is short enough, diffractions are the dominant feature. Real-world examples show that the shallow seismic reflection method and the georadar method are capable of recording the hyperbolic feature, which can be interpreted as vertical discontinuity. Thus, these methods show some promise as effective non-destructive detection methods for locating vertical discontinuities (e.g., fractures or crevices) in infrastructure such as dams and highway pavement. ?? 2007 Elsevier B.V. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Applied Geophysics","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.jappgeo.2006.12.001","issn":"09269851","usgsCitation":"Liu, J., Xia, J., Luo, Y., Chen, C., Li, X., and Huang, Y., 2007, Wave field features of shallow vertical discontinuity and their application in non-destructive detection: Journal of Applied Geophysics, v. 62, no. 3, p. 270-280, https://doi.org/10.1016/j.jappgeo.2006.12.001.","startPage":"270","endPage":"280","numberOfPages":"11","costCenters":[],"links":[{"id":212983,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.jappgeo.2006.12.001"},{"id":240559,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"62","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bcf94e4b08c986b32e99c","contributors":{"authors":[{"text":"Liu, J.","contributorId":23672,"corporation":false,"usgs":false,"family":"Liu","given":"J.","affiliations":[],"preferred":false,"id":425038,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Xia, J.","contributorId":63513,"corporation":false,"usgs":true,"family":"Xia","given":"J.","email":"","affiliations":[],"preferred":false,"id":425041,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Luo, Y.","contributorId":28417,"corporation":false,"usgs":true,"family":"Luo","given":"Y.","email":"","affiliations":[],"preferred":false,"id":425039,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Chen, C.","contributorId":98490,"corporation":false,"usgs":true,"family":"Chen","given":"C.","email":"","affiliations":[],"preferred":false,"id":425043,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Li, X.","contributorId":67635,"corporation":false,"usgs":true,"family":"Li","given":"X.","email":"","affiliations":[],"preferred":false,"id":425042,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Huang, Y.","contributorId":62000,"corporation":false,"usgs":true,"family":"Huang","given":"Y.","email":"","affiliations":[],"preferred":false,"id":425040,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70029927,"text":"70029927 - 2007 - Reproductive biology of the brown tree snake, Boiga irregularis (Reptilia: Colubridae), during colonization of Guam and comparison with that in their native range","interactions":[],"lastModifiedDate":"2012-03-12T17:21:35","indexId":"70029927","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2990,"text":"Pacific Science","active":true,"publicationSubtype":{"id":10}},"title":"Reproductive biology of the brown tree snake, Boiga irregularis (Reptilia: Colubridae), during colonization of Guam and comparison with that in their native range","docAbstract":"Since their introduction to Guam shortly after World War II, brown tree snakes, Boiga irregularis (Merrem), have seriously impacted the biota and human population of the island. Understanding the biology of this exotic species will likely be important to the success of control programs. We compared the reproductive biology of 782 B. irregularis caught on Guam during the 1980s with results from published studies of native-range populations. Average and maximum sizes of mature snakes on Guam were larger than those from Australian populations. The majority of female brown tree snakes matured at snoutvent lengths (SVLs) of 910-1,025 mm, and most males matured at SVLs of 940-1,030 mm. on Guam. Based on growth rates from the early 1990s on Guam, sexual maturity is estimated to occur during a snake's third or fourth year. Only one female (0.3%) in our data set had oviductal eggs. Clutch size was estimated at 4.3 (SD = 2.2), based on large vitellogenic ovarian follicle (???30 mm in length) and oviductal egg counts. Unlike their Australian counterparts, the Guam population reproduced year-round. Our data offer insights into the likely reproductive patterns of brown tree snakes should they infest other islands in the Pacific region. ?? 2007 by University of Hawai'i Press. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Pacific Science","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.2984/1534-6188(2007)61[191:RBOTBT]2.0.CO;2","issn":"00308870","usgsCitation":"Savidge, J.A., Qualls, F., and Rodda, G., 2007, Reproductive biology of the brown tree snake, Boiga irregularis (Reptilia: Colubridae), during colonization of Guam and comparison with that in their native range: Pacific Science, v. 61, no. 2, p. 191-199, https://doi.org/10.2984/1534-6188(2007)61[191:RBOTBT]2.0.CO;2.","startPage":"191","endPage":"199","numberOfPages":"9","costCenters":[],"links":[{"id":240653,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":213068,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.2984/1534-6188(2007)61[191:RBOTBT]2.0.CO;2"}],"volume":"61","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505aa8bce4b0c8380cd85a51","contributors":{"authors":[{"text":"Savidge, J. A.","contributorId":36078,"corporation":false,"usgs":false,"family":"Savidge","given":"J.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":424938,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Qualls, F.J.","contributorId":76551,"corporation":false,"usgs":true,"family":"Qualls","given":"F.J.","email":"","affiliations":[],"preferred":false,"id":424939,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Rodda, G.H.","contributorId":103998,"corporation":false,"usgs":true,"family":"Rodda","given":"G.H.","email":"","affiliations":[],"preferred":false,"id":424940,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70029933,"text":"70029933 - 2007 - Spatial patterns of large natural fires in Sierra Nevada wilderness areas","interactions":[],"lastModifiedDate":"2012-03-12T17:21:09","indexId":"70029933","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2602,"text":"Landscape Ecology","active":true,"publicationSubtype":{"id":10}},"title":"Spatial patterns of large natural fires in Sierra Nevada wilderness areas","docAbstract":"The effects of fire on vegetation vary based on the properties and amount of existing biomass (or fuel) in a forest stand, weather conditions, and topography. Identifying controls over the spatial patterning of fire-induced vegetation change, or fire severity, is critical in understanding fire as a landscape scale process. We use gridded estimates of fire severity, derived from Landsat ETM+ imagery, to identify the biotic and abiotic factors contributing to the observed spatial patterns of fire severity in two large natural fires. Regression tree analysis indicates the importance of weather, topography, and vegetation variables in explaining fire severity patterns between the two fires. Relative humidity explained the highest proportion of total sum of squares throughout the Hoover fire (Yosemite National Park, 2001). The lowest fire severity corresponded with increased relative humidity. For the Williams fire (Sequoia/Kings Canyon National Parks, 2003) dominant vegetation type explains the highest proportion of sum of squares. Dominant vegetation was also important in determining fire severity throughout the Hoover fire. In both fires, forest stands that were dominated by lodgepole pine (Pinus contorta) burned at highest severity, while red fir (Abies magnifica) stands corresponded with the lowest fire severities. There was evidence in both fires that lower wind speed corresponded with higher fire severity, although the highest fire severity in the Williams fire occurred during increased wind speed. Additionally, in the vegetation types that were associated with lower severity, burn severity was lowest when the time since last fire was fewer than 11 and 17 years for the Williams and Hoover fires, respectively. Based on the factors and patterns identified, managers can anticipate the effects of management ignited and naturally ignited fires at the forest stand and the landscape levels. ?? 2007 Springer Science+Business Media, Inc.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Landscape Ecology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1007/s10980-006-9047-5","issn":"09212973","usgsCitation":"Collins, B., Kelly, M., van Wagtendonk, J., and Stephens, S., 2007, Spatial patterns of large natural fires in Sierra Nevada wilderness areas: Landscape Ecology, v. 22, no. 4, p. 545-557, https://doi.org/10.1007/s10980-006-9047-5.","startPage":"545","endPage":"557","numberOfPages":"13","costCenters":[],"links":[{"id":240215,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":212690,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s10980-006-9047-5"}],"volume":"22","issue":"4","noUsgsAuthors":false,"publicationDate":"2006-10-19","publicationStatus":"PW","scienceBaseUri":"505b949de4b08c986b31abad","contributors":{"authors":[{"text":"Collins, B.M.","contributorId":33925,"corporation":false,"usgs":true,"family":"Collins","given":"B.M.","email":"","affiliations":[],"preferred":false,"id":424956,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Kelly, M.","contributorId":39585,"corporation":false,"usgs":true,"family":"Kelly","given":"M.","affiliations":[],"preferred":false,"id":424957,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"van Wagtendonk, J. W.","contributorId":85111,"corporation":false,"usgs":true,"family":"van Wagtendonk","given":"J. W.","affiliations":[],"preferred":false,"id":424958,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Stephens, S.L.","contributorId":85694,"corporation":false,"usgs":true,"family":"Stephens","given":"S.L.","email":"","affiliations":[],"preferred":false,"id":424959,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70029951,"text":"70029951 - 2007 - Three-dimensional structure of fluid conduits sustaining an active deep marine cold seep","interactions":[],"lastModifiedDate":"2017-10-04T17:04:20","indexId":"70029951","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1807,"text":"Geophysical Research Letters","active":true,"publicationSubtype":{"id":10}},"title":"Three-dimensional structure of fluid conduits sustaining an active deep marine cold seep","docAbstract":"Cold seeps in deep marine settings emit fluids to the overlying ocean and are often associated with such seafloor flux indicators as chemosynthetic biota, pockmarks, and authigenic carbonate rocks. Despite evidence for spatiotemporal variability in the rate, locus, and composition of cold seep fluid emissions, the shallow subseafloor plumbing systems have never been clearly imaged in three dimensions. Using a novel, high-resolution approach, we produce the first three-dimensional image of possible fluid conduits beneath a cold seep at a study site within the Blake Ridge gas hydrate province. Complex, dendritic features diverge upward toward the seafloor from feeder conduits at depth and could potentially draw flow laterally by up to 103 m from the known seafloor seep, a pattern similar to that suggested for some hydrothermal vents. The biodiversity, community structure, and succession dynamics of chemosynthetic communities at cold seeps may largely reflect these complexities of subseafloor fluid flow.
","language":"English","publisher":"Wiley","doi":"10.1029/2006GL028859","issn":"00948276","usgsCitation":"Hornbach, M., Ruppel, C., and Van Dover, C., 2007, Three-dimensional structure of fluid conduits sustaining an active deep marine cold seep: Geophysical Research Letters, v. 34, no. 5, L05601; 5 p., https://doi.org/10.1029/2006GL028859.","productDescription":"L05601; 5 p.","costCenters":[{"id":186,"text":"Coastal and Marine Geology Program","active":true,"usgs":true},{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":477216,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2006gl028859","text":"Publisher Index Page"},{"id":240558,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"Blake Ridge ","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -74.5,\n 27.5\n ],\n [\n -82.5,\n 27.5\n ],\n [\n -82.5,\n 34.5\n ],\n [\n -74.5,\n 34.5\n ],\n [\n -74.5,\n 27.5\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"34","issue":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bb349e4b08c986b325cca","contributors":{"authors":[{"text":"Hornbach, M.J.","contributorId":94104,"corporation":false,"usgs":true,"family":"Hornbach","given":"M.J.","email":"","affiliations":[],"preferred":false,"id":425036,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Ruppel, C.","contributorId":82050,"corporation":false,"usgs":true,"family":"Ruppel","given":"C.","email":"","affiliations":[],"preferred":false,"id":425035,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Van Dover, C.L.","contributorId":104507,"corporation":false,"usgs":true,"family":"Van Dover","given":"C.L.","affiliations":[],"preferred":false,"id":425037,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70029950,"text":"70029950 - 2007 - Species-area curves indicate the importance of habitats' contributions to regional biodiversity","interactions":[],"lastModifiedDate":"2019-11-12T06:04:59","indexId":"70029950","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1456,"text":"Ecological Indicators","active":true,"publicationSubtype":{"id":10}},"title":"Species-area curves indicate the importance of habitats' contributions to regional biodiversity","docAbstract":"We examined species-area curves, species composition and similarity (Jaccard's coefficients), and species richness in 17 vegetation types to develop a composite index of a vegetation type's contribution to regional species richness. We collected data from 1 to 1000 m2 scales in 147 nested plots in Rocky Mountain National Park, Colorado, USA to compare three species-area curve models' abilities to estimate the number of species observed in each vegetation type. The log(species)-log(area) curve had the largest adjusted coefficients of determination (r2 values) in 12 of the 17 types, followed by the species-log(area) curve with five of the highest values. When the slopes of the curves were corrected for species overlap among plots with Jaccard's coefficients, the species-log(area) curves estimated values closest to those observed. We combined information from species-area curves and measures of heterogeneity with information on the area covered by each vegetation type and found that the types making the greatest contributions to regional biodiversity covered the smallest areas. This approach may provide an accurate and relatively rapid way to rank hotspots of plant diversity within regions of interest.
","language":"English","publisher":"Elsevier Applied Science","doi":"10.1016/j.ecolind.2006.03.002","issn":"1470160X","usgsCitation":"Chong, G., and Stohlgren, T., 2007, Species-area curves indicate the importance of habitats' contributions to regional biodiversity: Ecological Indicators, v. 7, no. 2, p. 387-395, https://doi.org/10.1016/j.ecolind.2006.03.002.","productDescription":"9 p.","startPage":"387","endPage":"395","numberOfPages":"9","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":481,"text":"Northern Rocky Mountain Science Center","active":true,"usgs":true}],"links":[{"id":240528,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":212957,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.ecolind.2006.03.002"}],"country":"United States","state":"Colorado","otherGeospatial":"Rocky Mountain National 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biochemical analysis of rainbow trout LCK suggests a conserved mechanism for T-cell signaling in gnathostomes","docAbstract":"Two genes were identified in rainbow trout that display high sequence identity to vertebrate Lck. Both of the trout Lck transcripts are associated with lymphoid tissues and were found to be highly expressed in IgM-negative lymphocytes. In vitro analysis of trout lymphocytes indicates that trout Lck mRNA is up-regulated by T-cell mitogens, supporting an evolutionarily conserved function for Lck in the signaling pathways of T-lymphocytes. Here, we describe the generation and characterization of a specific monoclonal antibody raised against the N-terminal domains of recombinant trout Lck that can recognize Lck protein(s) from trout thymocyte lysates that are similar in size (???57 kDa) to mammalian Lck. This antibody also reacted with permeabilized lymphocytes during FACS analysis, indicating its potential usage for cellular analyses of trout lymphocytes, thus representing an important tool for investigations of salmonid T-cell function.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Molecular Immunology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.molimm.2006.11.021","issn":"01615890","usgsCitation":"Laing, K., Dutton, S., and Hansen, J., 2007, Molecular and biochemical analysis of rainbow trout LCK suggests a conserved mechanism for T-cell signaling in gnathostomes: Molecular Immunology, v. 44, no. 10, p. 2737-2748, https://doi.org/10.1016/j.molimm.2006.11.021.","startPage":"2737","endPage":"2748","numberOfPages":"12","costCenters":[],"links":[{"id":212956,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.molimm.2006.11.021"},{"id":240527,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"44","issue":"10","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a5cf3e4b0c8380cd70060","contributors":{"authors":[{"text":"Laing, K.J.","contributorId":17037,"corporation":false,"usgs":true,"family":"Laing","given":"K.J.","email":"","affiliations":[],"preferred":false,"id":425030,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Dutton, S.","contributorId":34328,"corporation":false,"usgs":true,"family":"Dutton","given":"S.","email":"","affiliations":[],"preferred":false,"id":425031,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hansen, J.D.","contributorId":107880,"corporation":false,"usgs":true,"family":"Hansen","given":"J.D.","email":"","affiliations":[],"preferred":false,"id":425032,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70029947,"text":"70029947 - 2007 - Territoriality, prospecting, and dispersal in cooperatively breeding Micronesian Kingfishers (Todiramphus cinnamominus reichenbachii)","interactions":[],"lastModifiedDate":"2017-11-15T10:00:40","indexId":"70029947","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3544,"text":"The Auk","onlineIssn":"1938-4254","printIssn":"0004-8038","active":true,"publicationSubtype":{"id":10}},"title":"Territoriality, prospecting, and dispersal in cooperatively breeding Micronesian Kingfishers (Todiramphus cinnamominus reichenbachii)","docAbstract":"We investigated territoriality, prospecting, and dispersal behavior in cooperatively breeding Pohnpei Micronesian Kingfishers (Todiramphus cinnamominus reichenbachii) throughout the annual cycle using radiotelemetry and color-band resights. Mean home-range size was 6.3 ha and territories were 8.1 ha. Within territories, Micronesian Kingfishers shared 63% of their home-range space with coterritorial occupants, and 3% was shared with extraterritorial conspecifics. Birds on cooperative territories had larger home ranges that overlapped more with coterritory occupants' home ranges than birds in pair-held territories. Despite evidence suggesting that resources necessary for survival and reproduction occurred on each territory, Micronesian Kingfishers of all age and sex classes made extraterritorial prospecting movements. Prospecting was rare; it comprised only 4.3% of our observations. When birds departed on forays, they were gone for ∼1.9 h and returned to home territories before sunset. Prospecting by dominant birds was temporally correlated with courtship and nest initiation, and birds were observed at neighboring nest sites with opposite-sex conspecifics during the period when females were available for fertilization. Juveniles and helpers prospected throughout the year and made repeated homesteading movements to dispersal destinations before dispersing. Mean dispersal distance for radiomarked individuals was 849 m. Results suggest that prospecting in Micronesian Kingfishers is a complex behavior that provides information for dispersal decisions and familiarity with dispersal destinations. Additionally, extraterritorial movements may provide covert opportunities for reproduction, which have potential to profoundly influence the distribution of fitness among helper and dominant Micronesian Kingfishers.
","language":"English","publisher":"American Ornithological Society","doi":"10.1642/0004-8038(2007)124[381:TPADIC]2.0.CO;2","issn":"00048038","usgsCitation":"Kesler, D., and Haig, S.M., 2007, Territoriality, prospecting, and dispersal in cooperatively breeding Micronesian Kingfishers (Todiramphus cinnamominus reichenbachii): The Auk, v. 124, no. 2, p. 381-395, https://doi.org/10.1642/0004-8038(2007)124[381:TPADIC]2.0.CO;2.","productDescription":"15 p.","startPage":"381","endPage":"395","costCenters":[{"id":290,"text":"Forest and Rangeland Ecosystem Science Center","active":false,"usgs":true}],"links":[{"id":476958,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1642/0004-8038(2007)124[381:tpadic]2.0.co;2","text":"Publisher Index Page"},{"id":240494,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"124","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505ba56ae4b08c986b320a2a","contributors":{"authors":[{"text":"Kesler, D.C.","contributorId":96485,"corporation":false,"usgs":true,"family":"Kesler","given":"D.C.","affiliations":[],"preferred":false,"id":425027,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Haig, S. M. 0000-0002-6616-7589","orcid":"https://orcid.org/0000-0002-6616-7589","contributorId":55389,"corporation":false,"usgs":true,"family":"Haig","given":"S.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":425026,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70029946,"text":"70029946 - 2007 - Modeling the influence of river discharge on salt intrusion and residual circulation in Danshuei River estuary, Taiwan","interactions":[],"lastModifiedDate":"2023-08-28T12:07:59.381307","indexId":"70029946","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1333,"text":"Continental Shelf Research","active":true,"publicationSubtype":{"id":10}},"title":"Modeling the influence of river discharge on salt intrusion and residual circulation in Danshuei River estuary, Taiwan","docAbstract":"A 3-D, time-dependent, baroclinic, hydrodynamic and salinity model was implemented and applied to the Danshuei River estuarine system and the adjacent coastal sea in Taiwan. The model forcing functions consist of tidal elevations along the open boundaries and freshwater inflows from the main stream and major tributaries in the Danshuei River estuarine system. The bottom friction coefficient was adjusted to achieve model calibration and verification in model simulations of barotropic and baroclinic flows. The turbulent diffusivities were ascertained through comparison of simulated salinity time series with observations. The model simulation results are in qualitative agreement with the available field data.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.csr.2006.12.005","issn":"02784343","usgsCitation":"Liu, W., Chen, W., Cheng, R.T., Hsu, M., and Kuo, A., 2007, Modeling the influence of river discharge on salt intrusion and residual circulation in Danshuei River estuary, Taiwan: Continental Shelf Research, v. 27, no. 7, p. 900-921, https://doi.org/10.1016/j.csr.2006.12.005.","productDescription":"22 p.","startPage":"900","endPage":"921","numberOfPages":"22","costCenters":[],"links":[{"id":212896,"rank":2,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.csr.2006.12.005"},{"id":240461,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"Taiwan","geographicExtents":"{\"type\":\"FeatureCollection\",\"features\":[{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[121.77782,24.39427],[121.17563,22.79086],[120.74708,21.97057],[120.22008,22.81486],[120.10619,23.55626],[120.69468,24.53845],[121.49504,25.29546],[121.95124,24.9976],[121.77782,24.39427]]]},\"properties\":{\"name\":\"Taiwan\"}}]}","volume":"27","issue":"7","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a5c48e4b0c8380cd6fb74","contributors":{"authors":[{"text":"Liu, W.-C.","contributorId":9468,"corporation":false,"usgs":true,"family":"Liu","given":"W.-C.","email":"","affiliations":[],"preferred":false,"id":425021,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Chen, W.-B.","contributorId":62413,"corporation":false,"usgs":true,"family":"Chen","given":"W.-B.","email":"","affiliations":[],"preferred":false,"id":425025,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Cheng, R. T.","contributorId":23138,"corporation":false,"usgs":false,"family":"Cheng","given":"R.","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":425022,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Hsu, M.-H.","contributorId":28074,"corporation":false,"usgs":true,"family":"Hsu","given":"M.-H.","email":"","affiliations":[],"preferred":false,"id":425023,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Kuo, A.Y.","contributorId":60444,"corporation":false,"usgs":true,"family":"Kuo","given":"A.Y.","email":"","affiliations":[],"preferred":false,"id":425024,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70029945,"text":"70029945 - 2007 - Utility of R0 as a predictor of disease invasion in structured populations","interactions":[],"lastModifiedDate":"2021-02-04T21:52:28.503504","indexId":"70029945","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2567,"text":"Journal of the Royal Society Interface","active":true,"publicationSubtype":{"id":10}},"displayTitle":"Utility of R0 as a predictor of disease invasion in structured populations","title":"Utility of R0 as a predictor of disease invasion in structured populations","docAbstract":"Early theoretical work on disease invasion typically assumed large and well-mixed host populations. Many human and wildlife systems, however, have small groups with limited movement among groups. In these situations, the basic reproductive number, R0, is likely to be a poor predictor of a disease pandemic because it typically does not account for group structure and movement of individuals among groups. We extend recent work by combining the movement of hosts, transmission within groups, recovery from infection and the recruitment of new susceptibles into a stochastic model of disease in a host metapopulation. We focus on how recruitment of susceptibles affects disease invasion and how population structure can affect the frequency of superspreading events (SSEs). We show that the frequency of SSEs may decrease with the reduced movement and the group sizes due to the limited number of susceptible individuals available. Classification tree analysis of the model results illustrates the hierarchical nature of disease invasion in host metapopulations. First, the pathogen must effectively transmit within a group (R0>1), and then the pathogen must persist within a group long enough to allow for movement among the groups. Therefore, the factors affecting disease persistence—such as infectious period, group size and recruitment of new susceptibles—are as important as the local transmission rates in predicting the spread of pathogens across a metapopulation.
","language":"English","publisher":"The Royal Society","doi":"10.1098/rsif.2006.0185","usgsCitation":"Cross, P.C., Johnson, P., Lloyd-Smith, J., and Getz, W.M., 2007, Utility of R0 as a predictor of disease invasion in structured populations: Journal of the Royal Society Interface, v. 4, no. 13, p. 315-324, https://doi.org/10.1098/rsif.2006.0185.","productDescription":"10 p.","startPage":"315","endPage":"324","numberOfPages":"10","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":481,"text":"Northern Rocky Mountain Science Center","active":true,"usgs":true}],"links":[{"id":477194,"rank":1,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"http://doi.org/10.1098/rsif.2006.0185","text":"External Repository"},{"id":240460,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"4","issue":"13","noUsgsAuthors":false,"publicationDate":"2006-11-23","publicationStatus":"PW","scienceBaseUri":"505bc0cde4b08c986b32a317","contributors":{"authors":[{"text":"Cross, Paul C. 0000-0001-8045-5213 pcross@usgs.gov","orcid":"https://orcid.org/0000-0001-8045-5213","contributorId":2709,"corporation":false,"usgs":true,"family":"Cross","given":"Paul","email":"pcross@usgs.gov","middleInitial":"C.","affiliations":[{"id":481,"text":"Northern Rocky Mountain Science Center","active":true,"usgs":true}],"preferred":true,"id":425019,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Johnson, Philip L.","contributorId":31810,"corporation":false,"usgs":true,"family":"Johnson","given":"Philip L.","affiliations":[],"preferred":false,"id":425020,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Lloyd-Smith, James O.","contributorId":31354,"corporation":false,"usgs":true,"family":"Lloyd-Smith","given":"James O.","affiliations":[],"preferred":false,"id":425018,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Getz, Wayne M.","contributorId":201830,"corporation":false,"usgs":false,"family":"Getz","given":"Wayne","email":"","middleInitial":"M.","affiliations":[{"id":36267,"text":"Dept of Environmental Science, University of California, Berkeley","active":true,"usgs":false}],"preferred":false,"id":425017,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ]}