Linking marine and freshwater growth in western Alaska Chinook salmon Oncorhynchus tshawytscha
G.T. Ruggerone, J.L. Nielsen, B.A. Agler
2009, Journal of Fish Biology (75) 1287-1301
The hypothesis that growth in Pacific salmon Oncorhynchus spp. is dependent on previous growth was tested using annual scale growth measurements of wild Chinook salmon Oncorhynchus tshawytscha returning to the Yukon and Kuskokwim Rivers, Alaska, from 1964 to 2004. First-year marine growth in individual O. tshawytscha was significantly correlated with...
Mangrove forest recovery in the Everglades following Hurricane Wilma
Daniel Sarmiento, Jordan Barr, Vic Engel, Jose D. Fuentes, Thomas J. Smith III, Jay C. Zieman
2009, LTER Network News (22)
On October 24th, 2005, Hurricane Wilma made landfall on the south western shore of the Florida peninsula. This major disturbance destroyed approximately 30 percent of the mangrove forests in the area. However, the damage to the ecosystem following the hurricane provided researchers at the Florida Coastal Everglades (FCE) LTER site...
Improving stream studies with a small-footprint green lidar
Jim McKean, Dan Isaak, Wayne Wright
2009, Eos, Transactions, American Geophysical Union (90) 341-342
Technology is changing how scientists and natural resource managers describe and study streams and rivers. A new generation of airborne aquatic-terrestrial lidars is being developed that can penetrate water and map the submerged topography inside a stream as well as the adjacent subaerial terrain and vegetation in one integrated mission....
Effects of experimental protocol on global vegetation model accuracy: a comparison of simulated and observed vegetation patterns for Asia
Guoping Tang, Sarah L. Shafer, Patrick J. Barlein, Justin O. Holman
2009, Ecological Modelling (220) 1481-1491
Prognostic vegetation models have been widely used to study the interactions between environmental change and biological systems. This study examines the sensitivity of vegetation model simulations to: (i) the selection of input climatologies representing different time periods and their associated atmospheric CO2 concentrations, (ii) the choice of observed vegetation data...
Improved constraints on the estimated size and volatile content of the Mount St. Helens magma system from the 2004–2008 history of dome growth and deformation
Larry G. Mastin, Mike Lisowski, Evelyn Roeloffs, Nick Beeler
2009, Geophysical Research Letters (36) 1-4
The history of dome growth and geodetic deflation during the 2004–2008 Mount St. Helens eruption can be fit to theoretical curves with parameters such as reservoir volume, bubble content, initial overpressure, and magma rheology, here assumed to be Newtonian viscous, with or without a solid plug in the conduit center....
Flood effects on an Alaskan stream restoration project: the value of long-term monitoring
Roseann V. Densmore, Kenneth F. Karle
2009, Journal of the American Water Resources Association (45) 1424-1433
On a nationwide basis, few stream restoration projects have long-term programs in place to monitor the effects of floods on channel and floodplain configuration and floodplain vegetation, but long-term and event-based monitoring is required to measure the effects of these stochastic events and to use the knowledge for adaptive management...
Ecology and the ratchet of events: climate variability, niche dimensions, and species distributions
Stephen T. Jackson, Julio L. Betancourt, Robert K. Booth, Stephen T. Gray
2009, Proceedings of the National Academy of Sciences (106) 19685-19692
Climate change in the coming centuries will be characterized by interannual, decadal, and multidecadal fluctuations superimposed on anthropogenic trends. Predicting ecological and biogeographic responses to these changes constitutes an immense challenge for ecologists. Perspectives from climatic and ecological history indicate that responses will be laden with contingencies, resulting from episodic...
Fluorescence-based proxies for lignin in freshwater dissolved organic matter
Peter J. Hernes, Brian A. Bergamaschi, Robert S. Eckard, Robert G.M. Spencer
2009, Journal of Geophysical Research G: Biogeosciences (114) 1-10
Lignin phenols have proven to be powerful biomarkers in environmental studies; however, the complexity of lignin analysis limits the number of samples and thus spatial and temporal resolution in any given study. In contrast, spectrophotometric characterization of dissolved organic matter (DOM) is rapid, noninvasive, relatively inexpensive, requires small sample volumes,...
First record of Blackpoll Warbler Dendroica striata from western Peru
R.T. Chesser, D. Susanibar
2009, Cotinga (31) 137-138
Factors related to the artificial incubation of wild bird eggs
Jon D. Klimstra, Katherine R. Stebbins, Gary H. Heinz, David J. Hoffman, Shannon R. Kondrad
2009, Avian Biology Research (2) 121-131
Attempts to artificially incubate the eggs of wild birds have failed in many respects in duplicating the success of natural incubation. As part of a larger study we had the opportunity to artificially incubate the eggs of 22 species of birds (three domestic and 19 wild species). We report the...
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...
High-resolution seismic-reflection images across the ICDP-USGS Eyreville deep drilling site, Chesapeake Bay impact structure
David S. Powars, Rufus D. Catchings, Mark R. Goldman, Gregory S. Gohn, J. Wright Horton Jr., Lucy E. Edwards, Michael J. Rymer, Gini Gandhok
2009, Special Paper of the Geological Society of America (458) 209-233
The U.S. Geological Survey (USGS) acquired two 1.4-km-long, high-resolution (~5 m vertical resolution) seismic-reflection lines in 2006 that cross near the International Continental Scientific Drilling Program (ICDP)-USGS Eyreville deep drilling site located above the late Eocene Chesapeake Bay impact structure in Virginia, USA. Five-meter spacing of seismic sources and geophones...
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...
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...
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,...
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...
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...
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...
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...
