Publications
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Using occupancy models to accommodate uncertainty in the interpretation of aerial photograph data: status of beaver in Central Oregon, USA Using occupancy models to accommodate uncertainty in the interpretation of aerial photograph data: status of beaver in Central Oregon, USA
Beavers (Castor canadensis) influence habitat for many species and pose challenges in developed landscapes. They are increasingly viewed as a cost-efficient means of riparian habitat restoration and water storage. Still, information on their status is rare, particularly in western North America. We used aerial photography to evaluate changes in beaver occupancy between 1942–1968 and 2009...
Authors
Christopher A. Pearl, M. J. Adams, Patricia K. Haggerty, Leslie Urban
Linking carbon and water limitations to drought-induced mortality of Pinus flexilis seedlings Linking carbon and water limitations to drought-induced mortality of Pinus flexilis seedlings
Survival of tree seedlings at high elevations has been shown to be limited by thermal constraints on carbon balance, but it is unknown if carbon relations also limit seedling survival at lower elevations, where water relations may be more important. We measured and modeled carbon fluxes and water relations in first-year Pinus flexilis seedlings in garden plots just beyond the warm edge...
Authors
Keith Reinhardt, Matthew J. Germino, Lara M. Kueppers, Jean-Christophe Domec, Jeffry Mitton
Estimating exposure of piscivorous birds and sport fish to mercury in California lakes using prey fish monitoring: a predictive tool for managers Estimating exposure of piscivorous birds and sport fish to mercury in California lakes using prey fish monitoring: a predictive tool for managers
Numerous water bodies in California are listed under the Clean Water Act as being impaired due to mercury (Hg) contamination. The Surface Water Ambient Monitoring Program (SWAMP), via the Bioaccumulation Oversight Group (BOG), has recently completed statewide surveys of contaminants in sport fish tissue from more than 250 lakes and rivers in California and throughout coastal waters. This...
Authors
Joshua T. Ackerman, C. Alex Hartman, Collin A. Eagles-Smith, Mark P. Herzog, Jay Davison, Gary Ichikawa, Autumn Bonnema
Behavior of the Hawaiian Hawaiian Hoary Bat (Lasiurus cinereus semotus) at wind turbines and its distribution across the North Ko'olau Mountains, O'ahu Behavior of the Hawaiian Hawaiian Hoary Bat (Lasiurus cinereus semotus) at wind turbines and its distribution across the North Ko'olau Mountains, O'ahu
We studied the landscape distribution of endemic Hawaiian hoary bats (Lasiurus cinereus semotus) on the north Ko‘olau Mountains of O‘ahu, Hawai‘i, from May 2013 to May 2014, while simultaneously studying their behavior at wind turbines within the broader landscape. This research aimed to assess the risk that wind turbines pose to bats on the island and integrated a variety of methods...
Authors
P. M. Gorresen, Paul M. Cryan, Manuela M.P. Huso, Cris D. Hein, Michael Schirmacher, Jessica H. Johnson, Kristina Montoya-Aiona, Kevin W. Brinck, Frank Bonaccorso
Effects and empirical critical loads of Nitrogen for ecoregions of the United States Effects and empirical critical loads of Nitrogen for ecoregions of the United States
Human activity in the last century has increased nitrogen (N) deposition to a level that has caused or is likely to cause alterations to the structure and function of many ecosystems across the United States. We synthesized current research relating atmospheric N deposition to effects on terrestrial and freshwater ecosystems in the United States, and estimated associated empirical...
Authors
Linda H. Pardo, Molly J. Robin-Abbott, Mark E. Fenn, Christine L. Goodale, Linda H. Geiser, Charles T. Driscoll, Edith B. Allen, Jill Baron, Roland Bobbink, William D. Bowman, C M Clark, B. Emmett, Frank S Gilliam, Tara L. Greaver, Sharon J Hall, Erik A. Lilleskov, Lingli Liu, Jason A. Lynch, Knute J Nadelhoffer, Steven S. Perakis, John L Stoddard, Kathleen C. Weathers, Robin L. Dennis
Home in the heat: Dramatic seasonal variation in home range of desert golden eagles informs management for renewable energy development Home in the heat: Dramatic seasonal variation in home range of desert golden eagles informs management for renewable energy development
Renewable energy is expanding quickly with sometimes dramatic impacts to species and ecosystems. To understand the degree to which sensitive species may be impacted by renewable energy projects, it is informative to know how much space individuals use and how that space may overlap with planned development. We used global positioning system–global system for mobile communications (GPS...
Authors
Melissa A. Braham, Tricia A. Miller, Adam E. Duerr, Michael J. Lanzone, Amy Fesnock-Parker, Larry LaPre, Daniel Driscoll, Todd E. Katzner
Managing habitat to slow or reverse population declines of the Columbia spotted frog in the Northern Great Basin Managing habitat to slow or reverse population declines of the Columbia spotted frog in the Northern Great Basin
Evaluating the effectiveness of habitat management actions is critical to adaptive management strategies for conservation of imperiled species. We quantified the response of a Great Basin population of the Columbia spotted frog (Rana luteiventris) to multiple habitat improvement actions aimed to reduce threats and reverse population declines. We used mark-recapture data for 1,394 adult...
Authors
David S. Pilliod, Richard D. Scherer
Sampling animal sign in heterogeneous environments: how much is enough? Sampling animal sign in heterogeneous environments: how much is enough?
Animal ecologists often use animal sign as a surrogate for direct observation of organisms, especially when species are secretive or difficult to observe. Spatial heterogeneity in arid environments makes it challenging to consistently detect and precisely characterize animal sign, which can bias estimates of animal abundance or habitat use. Piute ground squirrels (Urocitellus mollis) and...
Authors
Joseph D. Holbrook, Robert S. Arkle, Janet L. Rachlow, Kerri T. Vierling, David S. Pilliod
Estimation of occupancy, breeding success, and predicted abundance of golden eagles (Aquila chrysaetos) in the Diablo Range, California, 2014 Estimation of occupancy, breeding success, and predicted abundance of golden eagles (Aquila chrysaetos) in the Diablo Range, California, 2014
We used a multistate occupancy sampling design to estimate occupancy, breeding success, and abundance of territorial pairs of golden eagles (Aquila chrysaetos) in the Diablo Range, California, in 2014. This method uses the spatial pattern of detections and non-detections over repeated visits to survey sites to estimate probabilities of occupancy and successful reproduction while...
Authors
J. David Wiens, Patrick S. Kolar, Mark R. Fuller, W. Grainger Hunt, Teresa Hunt
Higher-order statistical moments and a procedure that detects potentially anomalous years as two alternative methods describing alterations in continuous environmental data Higher-order statistical moments and a procedure that detects potentially anomalous years as two alternative methods describing alterations in continuous environmental data
Statistics of central tendency and dispersion may not capture relevant or desired characteristics of the distribution of continuous phenomena and, thus, they may not adequately describe temporal patterns of change. Here, we present two methodological approaches that can help to identify temporal changes in environmental regimes. First, we use higher-order statistical moments (skewness...
Authors
Ivan Arismendi, Sherri L. Johnson, Jason B. Dunham
Mitigation effectiveness for improving nesting success of greater sage-grouse influenced by energy development Mitigation effectiveness for improving nesting success of greater sage-grouse influenced by energy development
Sagebrush Artemisia spp. habitats being developed for oil and gas reserves are inhabited by sagebrush obligate species — including the greater sage-grouse Centrocercus urophasianus (sage-grouse) that is currently being considered for protection under the U.S. Endangered Species Act. Numerous studies suggest increasing oil and gas development may exacerbate species extinction risks...
Authors
Christopher P. Kirol, Andrew L. Sutphin, Laura S. Bond, Mark R. Fuller, Thomas L. Maechtle
Convergence of soil nitrogen isotopes across global climate gradients Convergence of soil nitrogen isotopes across global climate gradients
Quantifying global patterns of terrestrial nitrogen (N) cycling is central to predicting future patterns of primary productivity, carbon sequestration, nutrient fluxes to aquatic systems, and climate forcing. With limited direct measures of soil N cycling at the global scale, syntheses of the 15 N: 14 N ratio of soil organic matter across climate gradients provide key insights into...
Authors
Joseph M. Craine, Andrew J. Elmore, Lixin Wang, Laurent Augusto, W. Troy Baisden, E. N. J. Brookshire, Michael D. Cramer, Niles J. Hasselquist, Erik A. Hobbie, Ansgar Kahmen, Keisuke Koba, J. Marty Kranabetter, Michelle C. Mack, Erika Marin-Spiotta, Jordan R. Mayor, Kendra K. McLauchlan, Anders Michelsen, Gabriela B. Nardoto, Rafael S. Oliveira, Steven S. Perakis, Pablo L. Peri, Carlos A. Quesada, Andreas Richter, Louis A. Schipper, Bryan A. Stevenson, Benjamin L. Turner, Ricardo A. G. Viani, Wolfgang Wanek, Bernd Zeller