Variation in northern bobwhite demography along two temporal scales
T.H. Folk, Randall R. Holmes, J. Barry Grand
2007, Population Ecology (49) 211-219
Quantification and understanding of demographic variation across intra- and inter-annual temporal scales can benefit from the development of theoretical models of evolution and applied conservation of species. We used long-term survey data for northern bobwhites (Colinus virginianus) collected at the northern and southern extent of its geographic range to develop...
Estimating fishing mortality, natural mortality, and selectivity using recoveries from tagging young fish
H. Jiang, C. Brownie, J.E. Hightower, K. H. Pollock
2007, North American Journal of Fisheries Management (27) 773-781
Current methods for estimation of age- and year-specific instantaneous mortality rates based on multiyear, multiple-age tagging studies assume that it is feasible to tag fish in a wide range of ages. For some species, however, only the youngest one or two age-classes are readily available for tagging. Given the practical...
Physical and hormonal examination of Missouri River shovelnose sturgeon reproductive stage: A reference guide
M. L. Wildhaber, D. M. Papoulias, A. J. DeLonay, D. E. Tillitt, J.L. Bryan, M.L. Annis
2007, Journal of Applied Ichthyology (23) 382-401
From May 2001 to June 2002 Wildhaber et al. (2005) conducted monthly sampling of Lower Missouri River shovelnose sturgeon (Scaphirhynchus platorynchus) to develop methods for determination of sex and the reproductive stage of sturgeons in the field. Shovelnose sturgeon were collected from the Missouri River and ultrasonic and endoscopic imagery and...
Dissolution of biogenic ooze over basement edifices in the equatorial Pacific with implications for hydrothermal ventilation of the oceanic crust
B.A. Bekins, A.J. Spivack, E.E. Davis, L. A. Mayer
2007, Geology (35) 679-682
Recent observations indicate that curious closed depressions in carbonate sediments overlying basement edifices are widespread in the equatorial Pacific. A possible mechanism for their creation is dissolution by fluids exiting basement vents from off-axis hydrothermal flow. Quantitative analysis based on the retrograde solubility...
Rainfall limit of the N cycle on Earth
Stephanie A. Ewing, Greg Michalski, Mark Thiemens, R.C. Quinn, J. L. Macalady, S. Kohl, Scott D. Wankel, Carol Kendall, Christopher P McKay, Ronald Amundson
2007, Global Biogeochemical Cycles (21)
In most climates on Earth, biological processes control soil N. In the Atacama Desert of Chile, aridity severely limits biology, and soils accumulate atmospheric NO3−. We examined this apparent transformation of the soil N cycle using a series of ancient Atacama Desert soils (>2 My) that vary in rainfall (21...
Consequences of land-cover misclassification in models of impervious surface
Gerard McMahon
2007, Photogrammetric Engineering and Remote Sensing (73) 1343-1353
Model estimates of impervious area as a function of landcover area may be biased and imprecise because of errors in the land-cover classification. This investigation of the effects of land-cover misclassification on impervious surface models that use National Land Cover Data (NLCD) evaluates the consequences of adjusting land-cover within a...
MT+, integrating magnetotellurics to determine earth structure, physical state, and processes
P. A. Bedrosian
2007, Conference Paper, Surveys in Geophysics
As one of the few deep-earth imaging techniques, magnetotellurics provides information on both the structure and physical state of the crust and upper mantle. Magnetotellurics is sensitive to electrical conductivity, which varies within the earth by many orders of magnitude and is modified by a range of earth processes. As...
USGS assessment of undiscovered oil and gas resources in Paleogene strata of the U.S. Gulf of Mexico coastal plain and state waters
Peter D. Warwick, James L. Coleman, Paul C. Hackley, Daniel O. Hayba, Alexander W. Karlsen, Elisabeth L. Rowan, Sharon M. Swanson
Lorcan Kennan, James Pindell, Norman C. Rosen, editor(s)
2007, Conference Paper, The Paleogene of the Gulf of Mexico and Caribbean basins: Processes, events, and petroleum systems
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...
Visible and near-infrared multispectral analysis of rocks at Meridiani Planum, Mars, by the Mars Exploration Rover Opportunity
W. H. Farrand, J.F. Bell III, J. R. Johnson, B.L. Jolliff, A.H. Knoll, S. M. McLennan, S. W. Squyres, W. M. Calvin, J.P. Grotzinger, R.V. Morris, J. Soderblom, S.D. Thompson, W.A. Watters, A. S. Yen
2007, Journal of Geophysical Research E: Planets (112)
Multispectral measurements in the visible and near infrared of rocks at Meridiani Planum by the Mars Exploration Rover Opportunity's Pancam are described. The Pancam multispectral data show that the outcrops of the Burns formation consist of two main spectral units which in stretched 673, 535, 432 nm color composites appear...
Impact of hurricanes storm surges on the groundwater resources
T. P. Van Biersel, D.A. Carlson, L.R. Milner
2007, Environmental Geology (53) 813-826
Ocean surges onto coastal lowlands caused by tropical and extra tropical storms, tsunamis, and sea level rise affect all coastal lowlands and present a threat to drinking water resources of many coastal residents. In 2005, two such storms, Hurricanes Katrina and Rita struck the Gulf Coast of the US. Since...
A model for estimating passive integrated transponder (PIT) tag antenna efficiencies for interval-specific emigration rates
G.E. Horton, T.L. Dubreuil, B. H. Letcher
2007, Transactions of the American Fisheries Society (136) 1165-1176
Our goal was to understand movement and its interaction with survival for populations of stream salmonids at long-term study sites in the northeastern United States by employing passive integrated transponder (PIT) tags and associated technology. Although our PIT tag antenna arrays spanned the stream channel (at most flows) and were...
Structure of the California Coast Ranges and San Andreas Fault at SAFOD from seismic waveform inversion and reflection imaging
F. Bleibinhaus, J.A. Hole, T. Ryberg, G. S. Fuis
2007, Journal of Geophysical Research B: Solid Earth (112)
[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...
Suspended sediment transport in an ephemeral stream following wildfire
D.V. Malmon, Steven L. Reneau, D. Katzman, A. Lavine, J. Lyman
2007, Journal of Geophysical Research F: Earth Surface (112)
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...
Environmental and ecological conditions surrounding the production of large year classes of walleye (Sander vitreus) in Saginaw Bay, Lake Huron
D.G. Fielder, J.S. Schaeffer, M.V. Thomas
2007, Journal of Great Lakes Research (33) 118-132
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...
Eogenetic karst hydrology: Insights from the 2004 hurricanes, peninsular Florida
L.J. Florea, H. Leonard Vacher
2007, Ground Water (45) 439-446
Eogenetic karst lies geographically and temporally close to the depositional environment of limestone in warm marine water at low latitude, in areas marked by midafternoon thunderstorms during a summer rainy season. Spring hydrographs from such an environment in north-central Florida are characterized by smooth, months-long, seasonal maxima. The passage of...
Rapid plant diversity assessment using a pixel nested plot design: A case study in Beaver Meadows, Rocky Mountain National Park, Colorado, USA
M. A. Kalkhan, E.J. Stafford, T.J. Stohlgren
2007, Diversity and Distributions (13) 379-388
Geospatial statistical modelling and thematic maps have recently emerged as effective tools for the management of natural areas at the landscape scale. Traditional methods for the collection of field data pertaining to questions of landscape were developed without consideration for the parameters of these applications. We introduce an alternative field...
Species richness and soil properties in Pinus ponderosa forests: A structural equation modeling analysis
D.C. Laughlin, S.R. Abella, W.W. Covington, J.B. Grace
2007, Journal of Vegetation Science (18) 231-242
Question: How are the effects of mineral soil properties on understory plant species richness propagated through a network of processes involving the forest overstory, soil organic matter, soil nitrogen, and understory plant abundance? Location: North-central Arizona, USA. Methods: We sampled 75 0.05-ha plots across a broad soil gradient in a...
Population-specific demographic estimates provide insights into declines of Lark Buntings (Calamospiza melanocorys)
A. A. Yackel Adams, S. K. Skagen, J. A. Savidge
2007, The Auk (124) 578-593
Many North American prairie bird populations have recently declined, and the causes of these declines remain largely unknown. To determine whether population limitation occurs during breeding, we evaluated the stability of a population of prairie birds using population-specific values for fecundity and postfledging survival. During 2001-2003, we radiomarked 67 female...
Lead (Pb) in old Antarctic ice: Some from dust, some from other sources
T. Hinkley
2007, Geophysical Research Letters (34)
Recently published data on amounts and isotopic compositions of lead (Pb) and on amounts of mineral dust in pre-industrial Antarctic ice can be further interpreted by means of simple calculations. These show that two distinct types of Pb were provided by the atmosphere to the continent in varying proportions during...
On the formation and structure of rare-earth element complexes in aqueous solutions under hydrothermal conditions with new data on gadolinium aqua and chloro complexes
Robert A. Mayanovic, Alan J. Anderson, William A. Bassett, I.-M. Chou
2007, Chemical Geology (239) 266-283
Synchrotron X-ray spectroscopy experiments were made on the Gd(III) aqua and chloro complexes in low pH aqueous solutions at temperatures ranging from 25 to 500????C and at pressures up to 480??MPa using a hydrothermal diamond anvil cell. Analysis of fluorescence Gd L3-edge X-ray absorption fine structure (XAFS) spectra measured from...
Improved wetland remote sensing in Yellowstone National Park using classification trees to combine TM imagery and ancillary environmental data
C. Wright, Alisa L. Gallant
2007, Remote Sensing of Environment (107) 582-605
The U.S. Fish and Wildlife Service uses the term palustrine wetland to describe vegetated wetlands traditionally identified as marsh, bog, fen, swamp, or wet meadow. Landsat TM imagery was combined with image texture and ancillary environmental data to model probabilities of palustrine wetland occurrence in Yellowstone National Park using classification...
Mangrove removal in the belize cays: effects on mangrove-associated fish assemblages in the intertidal and subtidal
D.S. Taylor, E.A. Reyier, W.P. Davis, C.C. McIvor
2007, Bulletin of Marine Science (80) 879-890
We investigated the effects of mangrove cutting on fish assemblages in Twin Cays, Belize, in two habitat types. We conducted visual censuses at two sites in adjoining undisturbed/disturbed (30%–70% of shoreline fringe removed) sub-tidal fringing Rhizophora mangle Linnaeus, 1753. Observers recorded significantly more species and individuals in undisturbed sites, especially...
Temperature-mediated differences in bacterial kidney disease expression and survival in Renibacterium salmoninarum-challenged bull trout and other salmonids
D.T. Jones, C.M. Moffitt, K.K. Peters
2007, North American Journal of Fisheries Management (27) 695-706
Resource managers considering restoration and reconnection of watersheds to protect and enhance threatened populations of bull trout Salvelinus confluentus have little information about the consequences of bacterial kidney disease (BKD) caused by Renibacterium salmoninarum. To better understand the response of bull trout to R. salmoninarum challenge, we conducted several laboratory...
Effects of management and climate on elk brucellosis in the Greater Yellowstone Ecosystem
P.C. Cross, W.H. Edwards, B.M. Scurlock, E.J. Maichak, J.D. Rogerson
2007, Ecological Applications (17) 957-964
Every winter, government agencies feed ∼6000 metric tons (6 × 106 kg) of hay to elk in the southern Greater Yellowstone Ecosystem (GYE) to limit transmission of Brucella abortus, the causative agent of brucellosis, from elk to cattle. Supplemental feeding, however, is likely to increase the transmission of brucellosis in...
Land cover variation and West Nile virus prevalence: Patterns, processes, and implications for disease control
V.O. Ezenwa, L.E. Milheim, M.F. Coffey, M.S. Godsey, R.J. King, S.C. Guptill
2007, Vector-Borne and Zoonotic Diseases (7) 173-180
Identifying links between environmental variables and infectious disease risk is essential to understanding how human-induced environmental changes will effect the dynamics of human and wildlife diseases. Although land cover change has often been tied to spatial variation in disease occurrence, the underlying factors driving the correlations are often unknown, limiting...
