Daily energy expenditure in free-ranging Gopher Tortoises (Gopherus polyphemus)
P.G.R. Jodice, D.M. Epperson, G. Henk Visser
2006, Copeia 129-136
Studies of ecological energetics in chelonians are rare. Here, we report the first measurements of daily energy expenditure (DEE) and water influx rates (WIRs) in free-ranging adult Gopher Tortoises (Gopherus polyphemus). We used the doubly labeled water (DLW) method to measure DEE in six adult tortoises during the non-breeding season...
Cross-shore velocity shear, eddies and heterogeneity in water column properties over fringing coral reefs: West Maui, Hawaii
C. D. Storlazzi, M.A. McManus, J.B. Logan, B.E. McLaughlin
2006, Continental Shelf Research (26) 401-421
A multi-day hydrographic survey cruise was conducted to acquire spatially extensive, but temporally limited, high-resolution, three-dimensional measurements of currents, temperature, salinity and turbidity off West Maui in the summer of 2003 to better understand coastal dynamics along a complex island shoreline with coral reefs. These data complement long-term, high-resolution tide,...
Phylogeography, phylogeny and hybridization in trichechid sirenians: Implications for manatee conservation
J. A. Vianna, Robert K. Bonde, S. Caballero, J. P. Giraldo, R. P. Lima, A. Clark, M. Marmontel, B. Morales-Vela, M. J. De Souza, L. Parr, M. A. Rodriguez-Lopez, A. A. Mignucci-Giannoni, J. A. Powell, F. R. Santos
2006, Molecular Ecology (15) 433-447
The three living species of manatees, West Indian (Trichechus manatus), Amazonian (Trichechus inunguis) and West African (Trichechus senegalensis), are distributed across the shallow tropical and subtropical waters of America and the western coast of Africa. We have sequenced the mitochondrial DNA control region in 330 Trichechus to compare their phylogeographic patterns. In T. manatus we...
Territoriality, site fidelity, and survivorship of willow flycatchers wintering in Costa Rica
T. J. Koronkiewicz, M. K. Sogge, Charles van Riper III, E. H. Paxton
2006, The Condor (108) 558-570
We studied wintering Willow Flycatchers (Empidonax traillii) in two seasonal freshwater wetland habitats in northwestern Costa Rica during five boreal winters, to determine habitat occupancy, overwinter and between-year site and territory fidelity, and the degree to which the sexes maintain and defend winter territories. Both males and females used agonistic...
Polychlorinated biphenyls, mercury, and potential endocrine disruption in fish from the Hudson River, New York, USA
Barry P. Baldigo, R.J. Sloan, S.B. Smith, N. D. Denslow, V. S. Blazer, T. S. Gross
2006, Aquatic Sciences (68) 206-228
Tissue residues of total mercury (Hg), total polychlorinated biphenyls (PCBs), and lipid-based PCBs; plasma concentrations of endocrine biomarkers; and reproductive and histologic biomarkers were assessed in 460 carp (Cyprinus carpio), bass (Micropterus salmoides and Micropterus dolomieui), and bullhead (Ameiurus nebulosus) collected from eight sites across the Hudson River Basin in...
Structure of the San Andreas fault zone at SAFOD from a seismic refraction survey
J.A. Hole, T. Ryberg, G. S. Fuis, F. Bleibinhaus, A.K. Sharma
2006, Geophysical Research Letters (33)
Refraction traveltimes from a 46-km long seismic survey across the San Andreas Fault were inverted to obtain two-dimensional velocity structure of the upper crust near the SAFOD drilling project. The model contains strong vertical and lateral velocity variations from <2 km/s to ???6 km/s. The Salinian terrane west of the...
Changes in the timing of winter-spring streamflows in eastern North America, 1913-2002
G.A. Hodgkins, R. W. Dudley
2006, Geophysical Research Letters (33)
Changes in the timing and magnitude of winter-spring streamflows were analyzed for gaging stations in eastern North America north of 41?? north latitude during various periods through 2002. Approximately 32 percent of stations north of 44?? have significantly earlier flows over the 50, 60, 70, and 90 year periods; 64...
Predator functional response and prey survival: Direct and indirect interactions affecting a marked prey population
David A. Miller, J.B. Grand, T.F. Fondell, M. Anthony
2006, Journal of Animal Ecology (75) 101-110
1. Predation plays an integral role in many community interactions, with the number of predators and the rate at which they consume prey (i.e. their functional response) determining interaction strengths. Owing to the difficulty of directly observing predation events, attempts to determine the functional response of predators in natural systems...
Estimating the size of fish consumed by double-crested cormorants: Considerations for better understanding cormorant-fish interactions
James H. Johnson, Robert M. Ross, James E. McKenna, Graham E. Lewis
2006, Journal of Great Lakes Research (32) 91-101
We measured 926 smallmouth bass (Micropterus dolomieu), 6,935 yellow perch (Perca flavescens), 6,416 rock bass (Ambloplites rupestris), and 4,852 pumpkinseed (Lepomis gibbosus) otoliths recovered from double-crested cormorant (Phalacrocorax auritus) pellets to determine the sizes (total lengths) of these fish consumed by cormorants. Otoliths were recovered from cormorant pellets collected from...
High-resolution stratigraphy of a Mississippi subdelta-lobe progradation in the Barataria Bight, north-central Gulf of Mexico
J. G. Flocks, N.F. Ferina, C. Dreher, J. L. Kindinger, D. M. FitzGerald, M.A. Kulp
2006, Journal of Sedimentary Research (76) 429-443
The coastal zone of southeastern Louisiana is the product of numerous cycles of progradation, abandonment, and marine transgression of the Mississippi River delta. Currently, the shoreline in the Barataria Bight is undergoing significant erosion and retreat, and understanding its evolution is crucial in stabilization efforts. This study uses an extensive...
Estimates of in situ gas hydrate concentration from resistivity monitoring of gas hydrate bearing sediments during temperature equilibration
M. Riedel, P.E. Long, T. S. Collett
2006, Marine Geology (227) 215-225
As part of Ocean Drilling Program Leg 204 at southern Hydrate Ridge off Oregon we have monitored changes in sediment electrical resistivity during controlled gas hydrate dissociation experiments. Two cores were used, each filled with gas hydrate bearing sediments (predominantly mud/silty mud). One core was from Site 1249 (1249F-9H3), 42.1...
Tracermodel1- Excel workbook for calculation and presentation of environmental tracer data for simple groundwater mixtures: Use of chlorofluorocarbons in hydrology - a guidebook; Section III.10.3
J.K. Bohlke
2006, Report
Atmospheric environmental tracers commonly used to date groundwater on timescales of years to decades include CFC-11, CFC-12, CFC-113, SF6, 85Kr, 3 H and 3 H/3 H0 , where 3 H0 refers to initial tritium (3 H + tritiogenic 3 He) (Cook and Herczeg, 2000). Interpretation of age from environmental tracer...
Population structure, persistence, and seasonality of autochthonous Escherichia coli in temperate, coastal forest soil from a Great Lakes watershed
M.N. Byappanahalli, R.L. Whitman, D.A. Shively, M.J. Sadowsky, S. Ishii
2006, Environmental Microbiology (8) 504-513
The common occurrence of Escherichia coli in temperate soils has previously been reported, however, there are few studies to date to characterize its source, distribution, persistent capability and genetic diversity. In this study, undisturbed, forest soils within six randomly selected 0.5 m2 exclosure plots (covered by netting of 2.3 mm2...
Geochemical constraints on the genesis of the Scheelite dome intrusion-related gold deposit, Tombstone gold belt, Yukon, Canada
J.L. Mair, R.J. Goldfarb, C. A. Johnson, C.J.R. Hart, E.E. Marsh
2006, Economic Geology (101) 523-553
The Scheelite dome intrusion-related gold deposit, western Selwyn basin, Yukon, is hosted in hornfelsed metasedimentary strata that lie adjacent to the exposed apices of a monzogranite to quartz monzonite plutonic complex of the mid-Cretaceous Tombstone-Tungsten magmatic belt, Tintina gold province, Alaska and Yukon. A variety of mineralization styles occur throughout...
Continuous resistivity profiling to delineate submarine groundwater discharge - Examples and limitations
F. D. Day-Lewis, E.A. White, C. D. Johnson, J. W. Lane, M. Belaval
2006, Leading Edge (Tulsa, OK) (25) 724-728
Aquifer-ocean interaction, saline intrusion, and submarine groundwater discharge (SGD) are emerging topics in hydrology and oceanography with important implications for water-resource management and estuarine ecology. Although the threat of saltwater intrusion has long been recognized in coastal areas, SGD has, until recently, received much less attention. It is clear that...
Inverse modeling for seawater intrusion in coastal aquifers: Insights about parameter sensitivities, variances, correlations and estimation procedures derived from the Henry problem
E. Sanz, C.I. Voss
2006, Advances in Water Resources (29) 439-457
Inverse modeling studies employing data collected from the classic Henry seawater intrusion problem give insight into several important aspects of inverse modeling of seawater intrusion problems and effective measurement strategies for estimation of parameters for seawater intrusion. Despite the simplicity of the Henry problem, it embodies the behavior of a...
Oink if you love coal
E. R. Landa
2006, Geotimes (51) 60
No abstract available....
Acoustic stratigraphy of Bear Lake, Utah-Idaho: late Quaternary sedimentation patterns in a simple half-graben
Steven M. Colman
2006, Sedimentary Geology (185) 113-125
A 277-km network of high-resolution seismic-reflection profiles, supplemented with a sidescan-sonar mosaic of the lake floor, was collected in Bear Lake, Utah–Idaho, in order to explore the sedimentary framework of the lake's paleoclimate record. The acoustic stratigraphy is tied to a 120 m deep, continuously cored drill hole in the...
Beyond the obvious limits of ore deposits: The use of mineralogical, geochemical, and biological features for the remote detection of mineralization
D. L. Kelley, K.D. Kelley, W.B. Coker, B. Caughlin, M.E. Doherty
2006, Economic Geology (101) 729-752
Far field features of ore deposits include mineralogical, geochemical, or biological attributes that can be recognized beyond the obvious limits of the deposits. They can be primary, if formed in association with mineralization or alteration processes, or secondary, if formed from the interaction of ore deposits with the hydrosphere and...
A plastic flow model for the Acquara - Vadoncello landslide in Senerchia, Southern Italy
W. Savage, J. Wasowski
2006, Engineering Geology (83) 4-21
A previously developed model for stress and velocity fields in two-dimensional Coulomb plastic materials under self-weight and pore pressure predicts that long, shallow landslides develop slip surfaces that manifest themselves as normal faults and normal fault scarps at the surface in areas of extending flow and as thrust faults and...
Nitrogen
D.A. Kramer
2006, Mining Engineering (58) 45-46
In 2005, ammonia was produced by 15 companies at 26 plants in 16 states in the United States. Of the total ammonia production capacity, 55% was centered in Louisiana, Oklahoma and Texas because of their large reserves of natural gas. US producers operated at 66% of their rated capacity. In...
Perchlorate in pleistocene and holocene groundwater in North-Central New Mexico
Niel Plummer, J.K. Böhlke, M. W. Doughten
2006, Environmental Science & Technology (40) 1757-1763
Groundwater from remote parts of the Middle Rio Grande Basin in north-central New Mexico has perchlorate (ClO4-) concentrations of 0.12−1.8 μg/L. Because the water samples are mostly preanthropogenic in age (0−28 000 years) and there are no industrial sources in the study area, a natural source of the...
The influence of fall-spawning coho salmon (Oncorhynchus kisutch) on growth and production of juvenile coho salmon rearing in beaver ponds on the Copper River Delta, Alaska
D.W. Lang, G.H. Reeves, J.D. Hall, M.S. Wipfli
2006, Canadian Journal of Fisheries and Aquatic Sciences (63) 917-930
This study examined the influence of fall-spawning coho salmon (Oncorhynchus kisutch) on the density, growth rate, body condition, and survival to outmigration of juvenile coho salmon on the Copper River Delta, Alaska, USA. During the fall of 1999 and 2000, fish rearing in beaver ponds that received spawning salmon were...
A Bayesian random effects discrete-choice model for resource selection: Population-level selection inference
D.L. Thomas, D. Johnson, B. Griffith
2006, Journal of Wildlife Management (70) 404-412
Modeling the probability of use of land units characterized by discrete and continuous measures, we present a Bayesian random-effects model to assess resource selection. This model provides simultaneous estimation of both individual- and population-level selection. Deviance information criterion (DIC), a Bayesian alternative to AIC that is sample-size specific, is used...
Early Cretaceous terrestrial ecosystems in East Asia based on food-web and energy-flow models
M. Matsukawa, K. Saiki, M. Ito, I. Obata, D. J. Nichols, M.G. Lockley, R. Kukihara, K. Shibata
2006, Cretaceous Research (27) 285-307
In recent years, there has been global interest in the environments and ecosystems around the world. It is helpful to reconstruct past environments and ecosystems to help understand them in the present and the future. The present environments and ecosystems are an evolving continuum with those of the past and...
