High-resolution sclerochronological analysis of the bivalve mollusk Saxidomus gigantea from Alaska and British Columbia: techniques for revealing environmental archives and archaeological seasonality
Nadine Hallman, Meghan Burchell, Bernd R. Schone, Gail V. Irvine, David Maxwell
2009, Journal of Archaeological Science (36) 2353-2364
The butter clam, Saxidomus gigantea, is one of the most commonly recovered bivalves from archaeological shell middens on the Pacific Coast of North America. This study presents the results of the sclerochronology of modern specimens of S. gigantea, collected monthly from Pender Island (British Columbia), and additional modern specimens from...
Dynamic multistate site occupancy models to evaluate hypotheses relevant to conservation of Golden Eagles in Denali National Park, Alaska
Julien Martin, Carol L. McIntyre, James E. Hines, James D. Nichols, Joel A. Schmutz, Margaret C. MacCluskie
2009, Biological Conservation (142) 2726-2731
The recent development of multistate site occupancy models offers great opportunities to frame and solve decision problems for conservation that can be viewed in terms of site occupancy. These models have several characteristics (e.g., they account for detectability) that make them particularly well suited for addressing management and conservation problems....
Observations of periglacial landforms in Utopia Planitia with the High Resolution Imaging Science Experiment (HiRISE)
A. Lefort, P.S. Russell, N. Thomas, A. S. McEwen, C. M. Dundas, Randolph L. Kirk
2009, Journal of Geophysical Research (114)
The region of western Utopia Planitia (80-105 degreesE, 40-55 degrees N) displays several types of landforms similar to Earth periglacial features, including scallop-shaped depressions and networks of polygonal terrains. The scalloped depressions have been proposed to originate from thermokarstic processes such as sublimation and/or melting of near-surface ground ice. Using...
Does influenza A affect body condition of wild mallard ducks, or vice versa?
Paul L. Flint, J. Christian Franson
2009, Proceedings of the Royal Society B: Biological Sciences (276) 2345-2346
Low pathogenic avian influenza (LPAI) viruses are well documented to circulate within wild waterfowl populations (Olsen et. al. 2006). It has been assumed that these infections are benign with no subsequent effects on life-history parameters. The study by Latorre-Margalef et al. (2009; hereafter L.-M. et al.) represents an important step,...
Anacostia River fringe wetlands restoration project: final report for the five-year monitoring program (2003 through 2007)
Cairn C. Krafft, Richard S. Hammerschlag, Glenn R. Guntenspergen
2009, Report
The 6-hectare (ha) freshwater tidal Anacostia River Fringe Wetlands (Fringe Wetlands) were reconstructed along the mainstem of the Anacostia River in Washington, DC (Photograph 1, Figure 1) during the summer of 2003. The Fringe Wetlands consist of two separate planting cells. Fringe A, located adjacent to Lower Kingman Island, on...
Avian influenza at both ends of a migratory flyway: characterizing viral genomic diversity to optimize surveillance plans for North America
John M. Pearce, Andrew M. Ramey, Paul L. Flint, Anson V. Koehler, Joseph P. Fleskes, J. Christian Franson, Jeffrey S. Hall, Dirk V. Derksen, S. Ip
2009, Evolutionary Applications (2) 457-468
Although continental populations of avian influenza viruses are genetically distinct, transcontinental reassortment in low pathogenic avian influenza (LPAI) viruses has been detected in migratory birds. Thus, genomic analyses of LPAI viruses could serve as an approach to prioritize species and regions targeted by North American surveillance activities for foreign origin...
Geographic extent and chronology of the invasion of non-native lionfish (Pterois volitans [Linnaeus 1758] and P. miles [Bennett 1828]) in the Western North Atlantic and Caribbean Sea
Pamela J. Schofield
2009, Aquatic Invasions (4) 473-479
The Indo-Pacific lionfishes (Pterois volitans [Linnaeus 1758] and P. miles [Bennett 1828]: Family Scorpaenidae) are the first non-native marine fishes to establish in the Western North Atlantic. The chronology of the invasion is reported here using records from the US Geological Survey's Nonindigenous Aquatic Species database. Currently, lionfish are established...
Geographic variation in Bar-headed geese Anser indicus: connectivity of wintering and breeding grounds across a broad front
John Y. Takekawa, Shane R. Heath, David C. Douglas, William M. Perry, Sàlim Javed, Scott H. Newman, Rajendra N. Suwal, Asad R. Rahman, Binod C. Choudhury, Diann J. Prosser, Baoping Yan, Yuansheng Hou, Nyambayar Batbayar, Tseveenmayadag Natsagdorj, Charles M. Bishop, Patrick J. Butler, Peter B. Frappell, William K. Milsom, Graham R. Scott, Lucy A. Hawkes, Martin Wikelski
2009, Wildfowl (59) 100-123
The connectivity and frequency of exchange between sub-populations of migratory birds is integral to understanding population dynamics over the entire species' range. True geese are highly philopatric and acquire lifetime mates during the winter, suggesting that the number of distinct sub-populations may be related to the number of distinct wintering...
Differential escape from parasites by two competing introduced crabs
April M. Blakeslee, Carolyn L. Keogh, James E. Byers, Armand M. Kuris, Kevin D. Lafferty, Mark E. Torchin
2009, Marine Ecology Progress Series (393) 83-96
Although introduced species often interact with one another in their novel communities, the role of parasites in these interactions remains less clear. We examined parasite richness and prevalence in 2 shorecrab species with different invasion histories and residency times in an introduced region where their distributions overlap broadly. On the...
Determining Titan surface topography from Cassini SAR data
Bryan W. Stiles, Scott Hensley, Yonggyu Gim, David M. Bates, Randolph L. Kirk, Alex Hayes, Jani Radebaugh, Ralph D. Lorenz, Karl L. Mitchell, Philip S. Callahan, Howard Zebker, William T.K. Johnson, Stephen D. Wall, Jonathan I. Lunine, Charles A. Wood, Michael Janssen, Frederic Pelletier, Richard D. West, Chandini Veeramacheneni
2009, Icarus (202) 584-598
A technique, referred to as SARTopo, has been developed for obtaining surface height estimates with 10 km horizontal resolution and 75 m vertical resolution of the surface of Titan along each Cassini Synthetic Aperture Radar (SAR) swath. We describe the technique and present maps of the co-located data sets. A...
An improved procedure for detection and enumeration of walrus signatures in airborne thermal imagery
Douglas M. Burn, Mark S. Udevitz, Suzann G. Speckman, R. Bradley Benter
2009, International Journal of Applied Earth Observation and Geoinformation (11) 324-333
In recent years, application of remote sensing to marine mammal surveys has been a promising area of investigation for wildlife managers and researchers. In April 2006, the United States and Russia conducted an aerial survey of Pacific walrus (Odobenus rosmarus divergens) using thermal infrared sensors to detect groups of animals...
Depletion of rice as food of waterfowl wintering in the Mississippi Alluvial Valley
Danielle M. Greer, Bruce D. Dugger, Kenneth J. Reinecke, Mark J. Petrie
2009, Journal of Wildlife Management (73) 1125-1133
Waterfowl habitat conservation strategies in the Mississippi Alluvial Valley (MAV) and several other wintering areas assume carrying capacity is limited by available food, and increasing food resources is an effective conservation goal. Because existing research on winter food abundance and depletion is insufficient to test this hypothesis, we used harvested...
Consumer-resource theory predicts dynamic transitions between outcomes of interspecific interactions
J. Nathaniel Holland, Donald L. DeAngelis
2009, Ecology Letters (12) 1357-1366
Interactions between two populations are often defined by their interaction outcomes; that is, the positive, neutral, or negative effects of species on one another. Yet, signs of outcomes are not absolute, but vary with the biotic and abiotic contexts of interactions. Here, we develop a general theory for transitions between...
Impacts of forest fragmentation on species richness: A hierarchical approach to community modelling
Elise F. Zipkin, Amielle DeWan, J. Andrew Royle
2009, Journal of Applied Ecology (46) 815-822
1. Species richness is often used as a tool for prioritizing conservation action. One method for predicting richness and other summaries of community structure is to develop species-specific models of occurrence probability based on habitat or landscape characteristics. However, this approach can be challenging for rare or elusive species for...
A simplified method for correcting contaminant concentrations in eggs for moisture loss.
Gary H. Heinz, Katherine R. Stebbins, Jon D. Klimstra, David J. Hoffman
2009, Environmental Toxicology and Chemistry (28) 1425-1428
We developed a simplified and highly accurate method for correcting contaminant concentrations in eggs for the moisture that is lost from an egg during incubation. To make the correction, one injects water into the air cell of the egg until overflowing. The amount of water injected corrects almost perfectly for...
A new species of Platyrrhinus (Chiroptera: Phyllostomidae) from western Colombia and Ecuador, with emended diagnoses of P. aquilus, P. dorsalis, and P. umbratus
Paul M. Velazco, Alfred L. Gardner
2009, Proceedings of the Biological Society of Washington (122) 249-281
The Neotropical bat genus Platyrrhinus (Chiroptera: Phyllostomidae: Stenodermatinae) currently comprises 15 species. Our morphological and morphometric analysis of large and medium-sized Platyrrhinus revealed a distinctive Undescribed species from western South America. We also recognize P. aquilus (Handley & Ferris 1972) and P. umbratus (Lyon 1902) as valid species. We describe...
Test of a method to calculate near-bank velocity and boundary shear stress
Jason W. Kean, Roger A. Kuhnle, J. Dungan Smith, Carlos V. Alonso, Eddy J. Langendoen
2009, Journal of Hydraulic Engineering (135) 588-601
Bayesian inference in camera trapping studies for a class of spatial capture-recapture models
J. Andrew Royle, K. Ullas Karanth, Arjun M. Gopalaswamy, N. Samba Kumar
2009, Ecology (90) 3233-3244
We develop a class of models for inference about abundance or density using spatial capture-recapture data from studies based on camera trapping and related methods. The model is a hierarchical model composed of two components: a point process model describing the distribution of individuals in space (or their home range...
A cautionary note on substituting spatial subunits for repeated temporal sampling in studies of site occupancy
William L. Kendall, Gary C. White
2009, Journal of Applied Ecology (46) 1182-1188
1. Assessing the probability that a given site is occupied by a species of interest is important to resource managers, as well as metapopulation or landscape ecologists. Managers require accurate estimates of the state of the system, in order to make informed decisions. Models that yield estimates of occupancy, while...
A new species of Reithrodontomys, subgenus Aporodon (Cricetidae: Neotominae), from the highlands of Costa Rica, with comments on Costa Rican and Panamanian Reithrodontomys
Alfred L. Gardner, Michael D. Carleton
2009, Bulletin of the American Museum of Natural History (331) 157-182
A new species of the rodent genus Reithrodontomys (Cricetidae: Neotominae) is described from Cerro Asuncion in the western Cordillera de Talamanca, Costa Rica. The long tail, elongate rostrum, bulbous braincase, and complex molars of the new species associate it with members of the subgenus Aporodon, tenuirostris species group. In its...
Critical steps for the continuing advancement of hydrogeophysics
Ty P A Ferre, Laurence Bentley, Andrew Binley, Niklas Linde, Andreas Kemna, Kamini Singha, K. Holliger, J. A. Huisman, Burke J. Minsley
2009, Eos Science News (90) 200-202
Special hydrogeophysics issues published by hydrology and geophysics journals, special sessions and workshops at conferences, and an increasing number of short courses demonstrate the growing interest in the use of geophysics for hydrologic investigations. The formation of the hydrogeophysics technical subcommittee of AGU's Hydrology section adds further evidence of the...
Identifying baldcypress-water tupelo regeneration classes in forested wetlands of the Atchafalaya Basin, Louisiana
Stephen P. Faulkner, Prajwol Bhattarai, Yvonne C. Allen, John A. Barras, Glenn C. Constant
2009, Wetlands (29) 809-817
Baldcypress-water tupelo (cypress-tupelo) swamps are critically important coastal forested wetlands found throughout the southeastern U.S. The long-term survival and sustainability of these swamp forests is unknown due to large-scale changes in hydrologic regimes that prevent natural regeneration following logging or mortality. We used NWI wetland maps and remotely sensed hydrologic...
Measuring CO2 emissions from coal fires in the U.S.
Allan Kolker, Mark A. Engle, J.C. Hower, J.M.K. O’Keefe, L.F. Radke, E.L. Heffern, A. ter-Schure, G.B. Stracher, A. Prakash, Yomayra A. Roman-Colon, Ricardo A. Olea
2009, Conference Paper
No abstract available....
Determining groundwater vulnerability to nitrate contamination from agricultural sources
Bernard T. Nolan
Eriberto Eulisse, Melike Hemmami, Esther M.J. Koopmanschap, editor(s)
2009, Conference Paper, Sustainable use of water in agriculture: Indicators and trends for water resources conservation
Paleomagnetism of Miocene volcanic rocks in the Newberry Mountains, California: Vertical-axis rotation and a polarity transition
John W. Hillhouse, R.E. Wells, B. F. Cox
2009, Book chapter, Overboard in the Mojave, 20 million years of lakes and wetlands
No abstract available....
