Nineteen variables, including precipitation, soils and geology, land use, and basin morphologic characteristics, were evaluated to develop Iowa regression models to predict total streamflow (Q), base flow (Qb), storm flow (Qs) and base flow percentage (%Qb) in gauged and ungauged watersheds in the state. Discharge records from a set of 33 watersheds across the state for the 1980 to 2000 period were separated into Qb and Qs. Multiple linear regression found that 75.5 percent of long term average Q was explained by rainfall, sand content, and row crop percentage variables, whereas 88.5 percent of Qb was explained by these three variables plus permeability and floodplain area variables. Qs was explained by average rainfall and %Qb was a function of row crop percentage, permeability, and basin slope variables. Regional regression models developed for long term average Q and Qb were adapted to annual rainfall and showed good correlation between measured and predicted values. Combining the regression model for Q with an estimate of mean annual nitrate concentration, a map of potential nitrate loads in the state was produced. Results from this study have important implications for understanding geomorphic and land use controls on streamflow and base flow in Iowa watersheds and similar agriculture dominated watersheds in the glaciated Midwest.
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\"}}]}","volume":"41","issue":"6","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0bb0e4b0c8380cd5281e","contributors":{"authors":[{"text":"Schilling, Keith E.","contributorId":106429,"corporation":false,"usgs":false,"family":"Schilling","given":"Keith","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":413212,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wolter, Calvin F.","contributorId":198897,"corporation":false,"usgs":false,"family":"Wolter","given":"Calvin","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":413211,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70029642,"text":"70029642 - 2005 - Estimation of regional material yield from coastal landslides based on historical digital terrain modelling","interactions":[],"lastModifiedDate":"2012-03-12T17:21:10","indexId":"70029642","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1425,"text":"Earth Surface Processes and Landforms","active":true,"publicationSubtype":{"id":10}},"title":"Estimation of regional material yield from coastal landslides based on historical digital terrain modelling","docAbstract":"High-resolution historical (1942) and recent (1994) digital terrain models were derived from aerial photographs along the Big Sur coastline in central California to measure the long-term volume of material that enters the nearshore environment. During the 52-year measurement time period, an average of 21 000 ?? 3100 m3 km-1 a-1 of material was eroded from nine study sections distributed along the coast, with a low yield of 1000 ?? 240 m3 km-1 a-1 and a high of 46 700 ?? 7300 m3 km-1 a-1. The results compare well with known volumes from several deep-seated landslides in the area and suggest that the processes by which material is delivered to the coast are episodic in nature. In addition, a number of parameters are investigated to determine what influences the substantial variation in yield along the coast. It is found that the magnitude of regional coastal landslide sediment yield is primarily related to the physical strength of the slope-forming material. Coastal Highway 1 runs along the lower portion of the slope along this stretch of coastline, and winter storms frequently damage the highway. The California Department of Transportation is responsible for maintaining this scenic highway while minimizing the impacts to the coastal ecosystems that are part of the Monterey Bay National Marine Sanctuary. This study provides environmental managers with critical background data on the volumes of material that historically enter the nearshore from landslides, as well as demonstrating the application of deriving historical digital terrain data to model landscape evolution. Published in 2005 by John Wiley & Sons, Ltd.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Earth Surface Processes and Landforms","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1002/esp.1168","issn":"01979337","usgsCitation":"Hapke, C., 2005, Estimation of regional material yield from coastal landslides based on historical digital terrain modelling: Earth Surface Processes and Landforms, v. 30, no. 6, p. 679-697, https://doi.org/10.1002/esp.1168.","startPage":"679","endPage":"697","numberOfPages":"19","costCenters":[],"links":[{"id":240541,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":212969,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1002/esp.1168"}],"volume":"30","issue":"6","noUsgsAuthors":false,"publicationDate":"2005-04-29","publicationStatus":"PW","scienceBaseUri":"505a0ba4e4b0c8380cd527f6","contributors":{"authors":[{"text":"Hapke, C.J.","contributorId":108233,"corporation":false,"usgs":true,"family":"Hapke","given":"C.J.","email":"","affiliations":[],"preferred":false,"id":423599,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70029640,"text":"70029640 - 2005 - Acute and chronic toxicity of lead in water and diet to the amphipod Hyalella azteca","interactions":[],"lastModifiedDate":"2020-11-16T15:48:36.205977","indexId":"70029640","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1571,"text":"Environmental Toxicology and Chemistry","active":true,"publicationSubtype":{"id":10}},"title":"Acute and chronic toxicity of lead in water and diet to the amphipod Hyalella azteca","docAbstract":"We evaluated the influence of waterborne and dietary lead (Pb) exposure on the acute and chronic toxicity of Pb to the amphipod Hyalella azteca. Test solutions were generated by a modified diluter with an extended (24‐h) equilibration period. Acute (96‐h) toxicity of Pb varied with water hardness in the range of 71 to 275 mg/L as CaCO3, despite similar dissolved Pb concentrations. Acute toxicity was greatest in soft test water, with less than 50% survival at the lowest dissolved Pb concentration (151 μg/L). Survival also was significantly reduced in medium‐hardness water but not in hard test water. In chronic (42‐d) studies, amphipods were exposed to waterborne Pb and fed either a control diet or a diet equilibrated with waterborne Pb levels. For animals fed the control diet, the median lethal concentration (LC50) for Pb was 24 μg/L (as dissolved Pb), and significant reductions in survival occurred at 16 μg/L. Exposure to Pb‐treated diets significantly increased toxicity across a wide range of dissolved Pb concentrations, with a LC50 of 16 μg/L and significant reductions in growth and reproduction at 3.5 μg/L. Significant effects on growth and reproduction occurred at dissolved Pb concentrations close to the current U.S. chronic water‐quality criterion. Our results suggest that both aqueous‐ and dietary‐exposure pathways contribute significantly to chronic Pb exposure and toxic effects in aquatic biota.
A new mathematical model clarifies how diverse styles and rates of landslide motion can result from regulation of Coulomb friction by dilation or contraction of water‐saturated basal shear zones. Normalization of the model equations shows that feedback due to coupling between landslide motion, shear zone volume change, and pore pressure change depends on a single dimensionless parameter α, which, in turn, depends on the dilatancy angle ψ and the intrinsic timescales for pore pressure generation and dissipation. If shear zone soil contracts during slope failure, then α < 0, and positive pore pressure feedback and runaway acceleration are inevitable. If the shear zone dilates, then α > 0, and negative feedback permits slow, steady landslide motion to occur while positive pore pressure is supplied by rain infiltration. Steady state slip velocities v0 obey v0 = −(K/ψ) p*e, where K is the hydraulic conductivity and p*e is the normalized (dimensionless) negative pore pressure generated by dilation. If rain infiltration and attendant pore pressure growth continue unabated, however, their influence ultimately overwhelms the stabilizing influence of negative p*e. Then, unbounded landslide acceleration occurs, accentuated by an instability that develops if ψ diminishes as landslide motion proceeds. Nonetheless, numerical solutions of the model equations show that slow, nearly steady motion of a clay‐rich landslide may persist for many months as a result of negative pore pressure feedback that regulates basal Coulomb friction. Similarly stabilized motion is less likely to occur in sand‐rich landslides that are characterized by weaker negative feedback.
","language":"English","publisher":"AGU","doi":"10.1029/2004JF000268","issn":"01480227","usgsCitation":"Iverson, R., 2005, Regulation of landslide motion by dilatancy and pore pressure feedback: Journal of Geophysical Research F: Earth Surface, v. 110, no. 2, 16 p., https://doi.org/10.1029/2004JF000268.","productDescription":"16 p.","costCenters":[{"id":615,"text":"Volcano Hazards Program","active":true,"usgs":true}],"links":[{"id":477700,"rank":10000,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2004jf000268","text":"Publisher Index Page"},{"id":235602,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":209302,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1029/2004JF000268"}],"volume":"110","issue":"2","noUsgsAuthors":false,"publicationDate":"2005-06-25","publicationStatus":"PW","scienceBaseUri":"50e4a5f7e4b0e8fec6cdc039","contributors":{"authors":[{"text":"Iverson, R.M. 0000-0002-7369-3819","orcid":"https://orcid.org/0000-0002-7369-3819","contributorId":16435,"corporation":false,"usgs":true,"family":"Iverson","given":"R.M.","affiliations":[],"preferred":false,"id":413094,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70029626,"text":"70029626 - 2005 - Heat as a tracer to estimate dissolved organic carbon flux from a restored wetland","interactions":[],"lastModifiedDate":"2018-10-31T10:25:20","indexId":"70029626","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1861,"text":"Ground Water","active":true,"publicationSubtype":{"id":10}},"title":"Heat as a tracer to estimate dissolved organic carbon flux from a restored wetland","docAbstract":"Heat was used as a natural tracer to characterize shallow ground water flow beneath a complex wetland system. Hydrogeologic data were combined with measured vertical temperature profiles to constrain a series of two‐dimensional, transient simulations of ground water flow and heat transport using the model code SUTRA (Voss 1990). The measured seasonal temperature signal reached depths of 2.7 m beneath the pond. Hydraulic conductivity was varied in each of the layers in the model in a systematic manual calibration of the two‐dimensional model to obtain the best fit to the measured temperature and hydraulic head. Results of a series of representative best‐fit simulations represent a range in hydraulic conductivity values that had the best agreement between simulated and observed temperatures and that resulted in simulated pond seepage values within 1 order of magnitude of pond seepage estimated from the water budget. Resulting estimates of ground water discharge to an adjacent agricultural drainage ditch were used to estimate potential dissolved organic carbon (DOC) loads resulting from the restored wetland. Estimated DOC loads ranged from 45 to 1340 g C/(m2 year), which is higher than estimated DOC loads from surface water. In spite of the complexity in characterizing ground water flow in peat soils, using heat as a tracer provided a constrained estimate of subsurface flow from the pond to the agricultural drainage ditch.
This study examines the development of a conceptual model of sediment processes in the upper Yuba River watershed; and we hypothesize how components of the conceptual model may be spatially distributed using a geographical information system (GIS). The conceptual model illustrates key processes controlling sediment dynamics in the upper Yuba River watershed and was tested and revised using field measurements, aerial photography, and low elevation videography. Field reconnaissance included mass wasting and channel storage inventories, assessment of annual channel change in upland tributaries, and evaluation of the relative importance of sediment sources and transport processes. Hillslope erosion rates throughout the study area are relatively low when compared to more rapidly eroding landscapes such as the Pacific Northwest and notable hillslope sediment sources include highly erodible andesitic mudflows, serpentinized ultramafics, and unvegetated hydraulic mine pits. Mass wasting dominates surface erosion on the hillslopes; however, erosion of stored channel sediment is the primary contributor to annual sediment yield. We used GIS to spatially distribute the components of the conceptual model and created hillslope erosion potential and channel storage models. The GIS models exemplify the conceptual model in that landscapes with low potential evapotranspiration, sparse vegetation, steep slopes, erodible geology and soils, and high road densities display the greatest hillslope erosion potential and channel storage increases with increasing stream order. In-channel storage in upland tributaries impacted by hydraulic mining is an exception. Reworking of stored hydraulic mining sediment in low-order tributaries continues to elevate upper Yuba River sediment yields. Finally, we propose that spatially distributing the components of a conceptual model in a GIS framework provides a guide for developing more detailed sediment budgets or numerical models making it an inexpensive way to develop a roadmap for understanding sediment dynamics at a watershed scale.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.geomorph.2004.11.019","issn":"0169555X","usgsCitation":"Curtis, J.A., Flint, L.E., Alpers, C.N., and Yarnell, S., 2005, Conceptual model of sediment processes in the upper Yuba River watershed, Sierra Nevada, CA: Geomorphology, v. 68, no. 3-4, p. 149-166, https://doi.org/10.1016/j.geomorph.2004.11.019.","productDescription":"18 p.","startPage":"149","endPage":"166","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"links":[{"id":237860,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":210826,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.geomorph.2004.11.019"}],"volume":"68","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f9aae4b0c8380cd4d6fc","contributors":{"authors":[{"text":"Curtis, Jennifer A. 0000-0001-7766-994X jacurtis@usgs.gov","orcid":"https://orcid.org/0000-0001-7766-994X","contributorId":927,"corporation":false,"usgs":true,"family":"Curtis","given":"Jennifer","email":"jacurtis@usgs.gov","middleInitial":"A.","affiliations":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"preferred":true,"id":423461,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Flint, Lorraine E. 0000-0002-7868-441X lflint@usgs.gov","orcid":"https://orcid.org/0000-0002-7868-441X","contributorId":1184,"corporation":false,"usgs":true,"family":"Flint","given":"Lorraine","email":"lflint@usgs.gov","middleInitial":"E.","affiliations":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"preferred":true,"id":423460,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Alpers, Charles N. 0000-0001-6945-7365 cnalpers@usgs.gov","orcid":"https://orcid.org/0000-0001-6945-7365","contributorId":411,"corporation":false,"usgs":true,"family":"Alpers","given":"Charles","email":"cnalpers@usgs.gov","middleInitial":"N.","affiliations":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"preferred":true,"id":423462,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Yarnell, S.M.","contributorId":25753,"corporation":false,"usgs":true,"family":"Yarnell","given":"S.M.","email":"","affiliations":[],"preferred":false,"id":423459,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70029613,"text":"70029613 - 2005 - Simulating the evolution of coastal morphology and stratigraphy with a new morphological-behaviour model (GEOMBEST)","interactions":[],"lastModifiedDate":"2018-04-09T12:31:37","indexId":"70029613","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2667,"text":"Marine Geology","active":true,"publicationSubtype":{"id":10}},"title":"Simulating the evolution of coastal morphology and stratigraphy with a new morphological-behaviour model (GEOMBEST)","docAbstract":"A new morphological-behaviour model is used to simulate evolution of coastal morphology associated with cross-shore translations of the shoreface, barrier, and estuary. The model encapsulates qualitative principles drawn from established geological concepts that are parameterized to provide quantitative predictions of morphological change on geological time scales (order 10 3 years), as well as shorter time scales applicable for long-term coastal management (order 101 to 102 years). Changes in sea level, and sediment volume within the shoreface, barrier, and estuary, drive the model behaviour. Further parameters, defining substrate erodibility, sediment composition, and time-dependent shoreface response, constrain the evolution of the shoreface towards an equilibrium profile. Results from numerical experiments are presented for the low-gradient autochthonous setting of North Carolina and the steep allochthonous setting of the Washington shelf. Simulations in the Currituck region of North Carolina examined the influence of sediment supply, substrate composition, and substrate erodibility on barrier transgression. Results demonstrate that the presence of a lithified substrate reduces the rate of barrier transgression compared to scenarios where an erodible, sand-rich substrate exists. Simulations of the Washington coast, 20 km north of the Columbia River, confirmed that the model can reproduce complex stratigraphy involving regressive and transgressive phases of coastal evolution. Results suggest that the first major addition of sediment to the shelf occurred around 12 900 years ago and resulted from the rapid addition of sediment volume from the Columbia River attributed to the Missoula floods. This was followed by a period where little or no sediment was added (12 400-9100 BP) and a third period when most sediment was added to the shelf (9100 BP to present) from the Columbia River. Comparing results from each setting demonstrates an indirect control that substrate slope has on shoreface transgression rates. Shoreface transgression is shown to be sensitive to the rate of estuarine sedimentation, with the sensitivity increasing as substrate slope decreases.
","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Marine Geology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.margeo.2005.02.019","issn":"00253227","usgsCitation":"Stolper, D., List, J.H., and Thieler, E., 2005, Simulating the evolution of coastal morphology and stratigraphy with a new morphological-behaviour model (GEOMBEST): Marine Geology, v. 218, no. 1-4, p. 17-36, https://doi.org/10.1016/j.margeo.2005.02.019.","productDescription":"20 p.","startPage":"17","endPage":"36","costCenters":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":237826,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"North Carolina","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -76.3275146484375,\n 35.72421761691415\n ],\n [\n -75.377197265625,\n 35.72421761691415\n ],\n [\n -75.377197265625,\n 37.020098201368114\n ],\n [\n -76.3275146484375,\n 37.020098201368114\n ],\n [\n -76.3275146484375,\n 35.72421761691415\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"218","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b8fd7e4b08c986b31918a","contributors":{"authors":[{"text":"Stolper, D.","contributorId":56846,"corporation":false,"usgs":true,"family":"Stolper","given":"D.","email":"","affiliations":[],"preferred":false,"id":423453,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"List, J. H.","contributorId":70406,"corporation":false,"usgs":true,"family":"List","given":"J.","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":423454,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Thieler, E.R. 0000-0003-4311-9717","orcid":"https://orcid.org/0000-0003-4311-9717","contributorId":93082,"corporation":false,"usgs":true,"family":"Thieler","given":"E.R.","affiliations":[],"preferred":false,"id":423455,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70029612,"text":"70029612 - 2005 - Source mechanism of Vulcanian degassing at Popocatépetl Volcano, Mexico, determined from waveform inversions of very long period signals","interactions":[],"lastModifiedDate":"2019-05-01T10:37:26","indexId":"70029612","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2314,"text":"Journal of Geophysical Research B: Solid Earth","active":true,"publicationSubtype":{"id":10}},"title":"Source mechanism of Vulcanian degassing at Popocatépetl Volcano, Mexico, determined from waveform inversions of very long period signals","docAbstract":"The source mechanism of very long period (VLP) signals accompanying volcanic degassing bursts at Popocatépetl is analyzed in the 15–70 s band by minimizing the residual error between data and synthetics calculated for a point source embedded in a homogeneous medium. The waveforms of two eruptions (23 April and 23 May 2000) representative of mild Vulcanian activity are well reproduced by our inversion, which takes into account volcano topography. The source centroid is positioned 1500 m below the western perimeter of the summit crater, and the modeled source is composed of a shallow dipping crack (sill with easterly dip of 10°) intersecting a steeply dipping crack (northeast striking dike dipping 83° northwest), whose surface extension bisects the vent. Both cracks undergo a similar sequence of inflation, deflation, and reinflation, reflecting a cycle of pressurization, depressurization, and repressurization within a time interval of 3–5 min. The largest moment release occurs in the sill, showing a maximum volume change of 500–1000 m3, pressure drop of 3–5 MPa, and amplitude of recovered pressure equal to 1.2 times the amplitude of the pressure drop. In contrast, the maximum volume change in the dike is less (200–300 m3), with a corresponding pressure drop of 1–2 MPa and pressure recovery equal to the pressure drop. Accompanying these volumetric sources are single-force components with magnitudes of 108 N, consistent with melt advection in response to pressure transients. The source time histories of the volumetric components of the source indicate that significant mass movement starts within the sill and triggers a mass movement response in the dike within a few seconds. Such source behavior is consistent with the opening of a pathway for escape of pent-up gases from slow pressurization of the sill driven by magma crystallization. The opening of this pathway and associated rapid evacuation of volcanic gases induces the pressure drop. Pressure recovery in the magma filling the sill is driven by diffusion of gases from the resulting supersaturated melt into bubbles. Assuming a penny-shaped crack at ambient pressure of 40 MPa, the observed pressure and volume variations can be modeled with the following attributes: crack radius (100 m), crack aperture (5 m), bubble number density (1010–1012 m−3), initial bubble radius (10−6 m), final bubble radius (∼10−5 m), and net decrease of gas concentration in the melt (0.01 wt %).
","language":"English","publisher":"AGU Publications","doi":"10.1029/2004JB003524","issn":"01480227","usgsCitation":"Chouet, B.A., Dawson, P.B., and Arciniega-Ceballos, A., 2005, Source mechanism of Vulcanian degassing at Popocatépetl Volcano, Mexico, determined from waveform inversions of very long period signals: Journal of Geophysical Research B: Solid Earth, v. 110, no. 7, p. 1-20, https://doi.org/10.1029/2004JB003524.","productDescription":"20 p.","startPage":"1","endPage":"20","numberOfPages":"20","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":615,"text":"Volcano Hazards Program","active":true,"usgs":true}],"links":[{"id":477787,"rank":10000,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2004jb003524","text":"Publisher Index Page"},{"id":210799,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1029/2004JB003524"},{"id":237825,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"Mexico","otherGeospatial":" Popocatépetl Volcano","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -98.8494873046875,\n 18.841313810317\n ],\n [\n -98.41278076171875,\n 18.841313810317\n ],\n [\n -98.41278076171875,\n 19.29299799768025\n ],\n [\n -98.8494873046875,\n 19.29299799768025\n ],\n [\n -98.8494873046875,\n 18.841313810317\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"110","issue":"7","noUsgsAuthors":false,"publicationDate":"2005-07-06","publicationStatus":"PW","scienceBaseUri":"505b932de4b08c986b31a33f","contributors":{"authors":[{"text":"Chouet, Bernard A. 0000-0001-5527-0532 chouet@usgs.gov","orcid":"https://orcid.org/0000-0001-5527-0532","contributorId":3304,"corporation":false,"usgs":true,"family":"Chouet","given":"Bernard","email":"chouet@usgs.gov","middleInitial":"A.","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":true,"id":423452,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Dawson, Phillip B. dawson@usgs.gov","contributorId":2751,"corporation":false,"usgs":true,"family":"Dawson","given":"Phillip","email":"dawson@usgs.gov","middleInitial":"B.","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":true,"id":423451,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Arciniega-Ceballos, Alejandra","contributorId":57740,"corporation":false,"usgs":true,"family":"Arciniega-Ceballos","given":"Alejandra","affiliations":[],"preferred":false,"id":423450,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70029605,"text":"70029605 - 2005 - Sources, bioavailability, and photoreactivity of dissolved organic carbon in the Sacramento-San Joaquin River Delta","interactions":[],"lastModifiedDate":"2012-03-12T17:20:52","indexId":"70029605","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1007,"text":"Biogeochemistry","active":true,"publicationSubtype":{"id":10}},"title":"Sources, bioavailability, and photoreactivity of dissolved organic carbon in the Sacramento-San Joaquin River Delta","docAbstract":"We analyzed bioavailability, photoreactivity, fluorescence, and isotopic composition of dissolved organic carbon (DOC) collected at 13 stations in the Sacramento-San Joaquin River Delta during various seasons to estimate the persistence of DOC from diverse shallow water habitat sources. Prospective large-scale wetland restorations in the Delta may change the amount of DOC available to the food web as well as change the quality of Delta water exported for municipal use. Our study indicates that DOC contributed by Delta sources is relatively refractory and likely mostly the dissolved remnants of vascular plant material from degrading soils and tidal marshes rather than phytoplankton production. Therefore, the prospective conversion of agricultural land into submerged, phytoplankton-dominated habitats may reduce the undesired export of DOC from the Delta to municipal users. A median of 10% of Delta DOC was rapidly utilizable by bacterioplankton. A moderate dose of simulated solar radiation (286 W m-2 for 4 h) decreased the DOC bioavailability by an average of 40%, with a larger relative decrease in samples with higher initial DOC bioavailability. Potentially, a DOC-based microbial food web could support ???0.6 ?? 109 g C of protist production in the Delta annually, compared to ???17 ?? 109 g C phytoplankton primary production. Thus, DOC utilization via the microbial food web is unlikely to play an important role in the nutrition of Delta zooplankton and fish, and the possible decrease in DOC concentration due to wetland restoration is unlikely to have a direct effect on Delta fish productivity. ?? Springer 2005.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Biogeochemistry","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1007/s10533-004-3361-2","issn":"01682563","usgsCitation":"Stepanauskas, R., Moran, M., Bergamaschi, B., and Hollibaugh, J., 2005, Sources, bioavailability, and photoreactivity of dissolved organic carbon in the Sacramento-San Joaquin River Delta: Biogeochemistry, v. 74, no. 2, p. 131-149, https://doi.org/10.1007/s10533-004-3361-2.","startPage":"131","endPage":"149","numberOfPages":"19","costCenters":[],"links":[{"id":237716,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":210709,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s10533-004-3361-2"}],"volume":"74","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b93a6e4b08c986b31a5f2","contributors":{"authors":[{"text":"Stepanauskas, R.","contributorId":61937,"corporation":false,"usgs":true,"family":"Stepanauskas","given":"R.","affiliations":[],"preferred":false,"id":423428,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Moran, M.A.","contributorId":62385,"corporation":false,"usgs":true,"family":"Moran","given":"M.A.","email":"","affiliations":[],"preferred":false,"id":423429,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Bergamaschi, B.A. 0000-0002-9610-5581","orcid":"https://orcid.org/0000-0002-9610-5581","contributorId":22401,"corporation":false,"usgs":true,"family":"Bergamaschi","given":"B.A.","affiliations":[],"preferred":false,"id":423426,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Hollibaugh, J.T.","contributorId":22886,"corporation":false,"usgs":true,"family":"Hollibaugh","given":"J.T.","email":"","affiliations":[],"preferred":false,"id":423427,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70029603,"text":"70029603 - 2005 - Spatial and temporal use of a spawning site in the middle green river by wild and hatchery-reared razorback suckers","interactions":[],"lastModifiedDate":"2012-03-12T17:20:53","indexId":"70029603","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3624,"text":"Transactions of the American Fisheries Society","active":true,"publicationSubtype":{"id":10}},"title":"Spatial and temporal use of a spawning site in the middle green river by wild and hatchery-reared razorback suckers","docAbstract":"The population of endangered razorback suckers Xyrauchen texanus in the middle Green River (upper Colorado River basin) has declined during the last 40 years. The apparent cause for this decline is a lack of successful recruitment. This study used radiotelemetry to evaluate the ability of hatchery-reared razorback suckers to locate spawning areas where wild fish congregate during the ascending hydrographic limb of the snowmelt runoff. Hatchery-reared razorback suckers appeared to show similar reproductive behavior to wild fish. Both wild and hatchery-reared fish were found near the middle Green River spawning area between 1 and 25 May 2000. Hatchery fish occupied the same areas on the spawning site as wild fish, and remained on the spawning site during both nocturnal and diurnal hours. Males were more abundant on the spawning area than females, but the few females captured tended to stage away from the primary spawning area. The results from this study suggest hatchery-reared fish are capable of responding to natural cues that prompt spawning aggregations and are successful in locating existing spawning aggregations of wild fish. Given attention to stocking criteria, including genetic diversity and the size and time of stocking, the challenges of recovering razorback suckers will center on those factors that led to the population declines, particularly the survival of early life stages in off-channel habitats. ?? American Fisheries Society 2005.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Transactions of the American Fisheries Society","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1577/T04-097.1","issn":"00028487","usgsCitation":"Modde, T., Bowen, Z., and Kitcheyan, D., 2005, Spatial and temporal use of a spawning site in the middle green river by wild and hatchery-reared razorback suckers: Transactions of the American Fisheries Society, v. 134, no. 4, p. 937-944, https://doi.org/10.1577/T04-097.1.","startPage":"937","endPage":"944","numberOfPages":"8","costCenters":[],"links":[{"id":210686,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1577/T04-097.1"},{"id":237681,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"134","issue":"4","noUsgsAuthors":false,"publicationDate":"2011-01-09","publicationStatus":"PW","scienceBaseUri":"505b944ce4b08c986b31a9b7","contributors":{"authors":[{"text":"Modde, T.","contributorId":98243,"corporation":false,"usgs":true,"family":"Modde","given":"T.","affiliations":[],"preferred":false,"id":423423,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bowen, Z.H.","contributorId":81045,"corporation":false,"usgs":true,"family":"Bowen","given":"Z.H.","email":"","affiliations":[],"preferred":false,"id":423421,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Kitcheyan, D.C.","contributorId":85390,"corporation":false,"usgs":true,"family":"Kitcheyan","given":"D.C.","email":"","affiliations":[],"preferred":false,"id":423422,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ]}