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Documents disponibles écrits par cet auteur (13)
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Article
Roy T. Churchwell, Auteur ; Steve Kendall, Auteur ; Stephen C. Brown, Auteur ; Abby N. Powell, AuteurHatch-year Semipalmated Sandpipers Calidris pusilla use river deltas along the Beaufort Sea coast of Alaska as their first stops during fall migration. However, these sites are subject to extreme changes in water levels that affect available for[...]
Article
Roy T. Churchwell, Auteur ; Steve Kendall, Auteur ; Stephen C. Brown, Auteur ; Abby N. Powell, AuteurHatch-year Semipalmated Sandpipers Calidris pusilla use river deltas along the Beaufort Sea coast of Alaska as their first stops during fall migration. However, these sites are subject to extreme changes in water levels that affect available for[...]
Article
Brian H. Robinson, Auteur ; Heather A. Coletti, Auteur ; Laura M. Phillips, Auteur ; Abby N. Powell, AuteurThe quantification of prey remains is a common method for estimating the diet of a variety of birds. However, these estimates may be subject to biases based on prey body type, nesting habitat, and collection date. To better understand biases and[...]
Article
Brian H. Robinson, Auteur ; Heather A. Coletti, Auteur ; Laura M. Phillips, Auteur ; Abby N. Powell, AuteurThe quantification of prey remains is a common method for estimating the diet of a variety of birds. However, these estimates may be subject to biases based on prey body type, nesting habitat, and collection date. To better understand biases and[...]
Article
Rebecca L. Bentzen, Auteur ; Abby N. Powell, AuteurPost-fledging dispersal and site fidelity are poorly understood, particularly for sea ducks that spend the majority of their annual cycle at sea. This is the first description of movements and their timing for first-year (juvenile) and second-ye[...]
Article
Rebecca L. Bentzen, Auteur ; Abby N. Powell, AuteurPost-fledging dispersal and site fidelity are poorly understood, particularly for sea ducks that spend the majority of their annual cycle at sea. This is the first description of movements and their timing for first-year (juvenile) and second-ye[...]
Article
Rebecca L. Bentzen, Auteur ; Abby N. Powell, AuteurPost-fledging dispersal and site fidelity are poorly understood, particularly for sea ducks that spend the majority of their annual cycle at sea. This is the first description of movements and their timing for first-year (juvenile) and second-ye[...]
Article
Steffen Oppel, Auteur ; Abby N. Powell, AuteurArrival time on breeding or non-breeding areas is of interest in many ecological studies exploring fitness consequences of migratory schedules. However, in most field studies, it is difficult to precisely assess arrival time of individuals. Here[...]
Article
Rebecca L. Bentzen, Auteur ; Abby N. Powell, Auteur ; Tony D. Williams, Auteur ; Alexander S. Kitaysky, AuteurWe measured plasma concentrations of variables associated with lipid metabolism (free fatty acids, glycerol, triglyceride, and beta-hydroxybutyrate), protein metabolism (uric acid), and baseline corticosterone to characterize the nutritional sta[...]
Article
H. River Gates, Auteur ; Stephen Yezerinac, Auteur ; Abby N. Powell, Auteur ; Pavel S. Tomkovich, Auteur ; Olga P. Valchuk, Auteur ; Richard B. Lanctot, AuteurFive subspecies of Dunlins (Calidris alpina) that breed in Beringia are potentially sympatric during the non-breeding season. Studying their ecology during this period requires techniques to distinguish individuals by subspecies. Our objectives [...]
Article
Emily L. Weiser, Auteur ; Abby N. Powell, AuteurSamples such as regurgitated pellets and food remains have traditionally been used in studies of bird diets, but these can produce biased estimates depending on the digestibility of different foods. Stable isotope analysis has been developed as [...]
Article
Christopher M. Harwood, Auteur ; Robert E. Gill, Auteur ; Abby N. Powell, AuteurBreeding ecology studies of boreal waders have been relatively scarce in North America. This paucity is due in part to boreal habitats being difficult to access, and boreal waders being widely dispersed and thus difficult to monitor. Between 200[...]
Article
Using eggshell membranes as a non-invasive tool to investigate the source of nutrients in avian eggs
Steffen Oppel, Auteur ; Abby N. Powell, Auteur ; Diane M. O'Brien, AuteurDevelopment of minimally invasive techniques to collect nutritional information from free-living birds is desirable for both ethical and conservation reasons. Here, we explore the utility of waterfowl eggshell membranes to determine the nutrient[...]
