A5001147555- Avian ecology and behavior
- Marine animal studies overview
- Wildlife Ecology and Conservation
- Species Distribution and Climate Change
- Indigenous Studies and Ecology
- Environmental DNA in Biodiversity Studies
- Climate variability and models
- Climate change and permafrost
- Mercury impact and mitigation studies
- Fish Ecology and Management Studies
- Arctic and Antarctic ice dynamics
- Animal Behavior and Reproduction
- Heavy metals in environment
- Animal Vocal Communication and Behavior
- Isotope Analysis in Ecology
- Archaeology and ancient environmental studies
- Neuroendocrine regulation and behavior
- Cryospheric studies and observations
- Counseling Practices and Supervision
- Veterinary Pharmacology and Anesthesia
- Antenna Design and Analysis
- Underwater Acoustics Research
- Bat Biology and Ecology Studies
- Animal Nutrition and Physiology
- X-ray Spectroscopy and Fluorescence Analysis
United States Fish and Wildlife Service
2010-2025
University of Alaska Fairbanks
2010-2020
Health and Human Development (2HD) Research Network
2000
Ecological “big data” Human activities are rapidly altering the natural world. Nowhere is this more evident, perhaps, than in Arctic, yet region remains one of most remote and difficult to study. Researchers have increasingly relied on animal tracking data these regions understand individual species' responses, but if we want larger-scale change, need integrate our understanding across species. Davidson et al. introduce an open-source archive that currently hosts 15 million location points...
The Arctic is experiencing rapidly warming conditions, increasing predator abundance, and diminishing population cycles of keystone species such as lemmings. However, it still not known how many animals will respond to a changing climate with altered trophic interactions. We studied clutch size, incubation duration nest survival 17 taxa Arctic‐breeding shorebirds at 16 field sites over 7 years. predicted that physiological benefits higher temperatures earlier snowmelt would increase...
ABSTRACT For birds breeding in the Arctic, nest success is affected by timing of initiation, which partially determined local conditions such as snow cover. However, during non‐breeding season can carry over to affect breeding. We used tracking and data from 248 individuals 8 species subspecies Arctic‐breeding shorebirds estimate how initiation related like snowmelt phenology versus prior conditions, measured speed migration. Using path analysis, our global model showed that have similar...
Understanding how and where individuals migrate between breeding wintering areas is important for assessing threats, identifying conservation, determining a species’ vulnerability to changing environmental conditions. Between 2017 2020, we tracked post-breeding movements of 72 red phalaropes Phalaropus fulicarius with satellite tags from 7 Arctic-breeding sites in the Alaskan Central Canadian Arctic. All left their Arctic grounds (i.e. were obligate migrants) but then switched more...
Abstract Conservation status and management priorities are often informed by population trends. Trend estimates can be derived from surveys or models, but both methods associated with sources of uncertainty. Many Arctic-breeding shorebirds thought to declining based on migration and/or overwintering surveys, data lacking estimate the trends some shorebird species. In addition, for most species, little is known about stage(s) at which bottlenecks occur, such as breeding vs. nonbreeding...
Implanted transmitters have become an important tool for studying the ecology of sea ducks, but their effects remain largely undocumented. To address this, we assessed how abdominally implanted with percutaneous antennas affect vertical dive speeds, stroke frequencies, bottom time, and duration captive Common Eiders (Somateria mollissima). establish baselines, recorded video six birds diving 4.9 m prior to surgery, them 38- 47-g platform transmitter terminals, then 3.5 months after surgery...
Determining the dynamics of where and when individuals occur is necessary to understand population declines identify critical areas for populations conservation concern. However, there are few examples a spatially temporally explicit model has been used evaluate migratory bird across its entire annual cycle. We geolocator-derived migration tracks 84 Dunlin ( Calidris alpina ) on East Asian-Australasian Flyway (EAAF) construct network describing subspecies-specific patterns in space time....
ABSTRACT Some statistics in “Biochemical and clinical responses of Common Eiders to implanted satellite transmitters” were miscalculated due missing data. We provide corrected values for the affected variables. Corrected data did not affect conclusions paper.
First posted January 23, 2018 For additional information, contact: Director, Alaska Science Center U.S. Geological Survey 4230 University Drive Anchorage, 99508 We summarize recent (2002–17) publicly available information from studies within the 1002 Area of Arctic National Wildlife Refuge as well terrestrial and coastal ecosystems elsewhere on Coastal Plain that are relevant to Area. This report provides an update earlier research summaries caribou (Rangifer tarandus), forage quality...
Understanding and predicting large-scale ecological responses to global environmental change requires comparative studies across geographic scales with coordinated efforts standardized methodologies. We designed, applied, assessed protocols measure tundra herbivory at three spatial scales: plot, site (habitat), study area (landscape). The plot- site-level were tested in the field during summers 2014–2015 11 sites, nine of them consisting warming experimental plots included International...
Cameras are important tools used to determine nest fate, identify predators and evaluate behaviour; however, they may impact the parameters measure, thereby biasing results. We evaluated of cameras ˜ 10 m from on shorebird survival at Canning River Delta, Alaska, 2017–2018 ( n control = 122, camera 109) using a much larger sample size than in previous studies conducted Arctic random assignments discovery. found no effect presence daily (model‐averaged rate (DSR) 85% confidence interval (CI);...
Determining embryo age is important for predicting hatch dates, planning nest visitation schedules, and as a model covariate examining factors affecting survival behavior. Two common methods of estimating are egg candling flotation (floating). Despite the reliance on these methods, there little information regarding repeatability techniques between multiple observers, or whether produce equivalent estimates. To determine how compare if precision each method biased by individual paired...
La depredación de huevos es la causa primaria del fracaso nido para aves que anidan en tundra. El ganso Branta hutchinsii taverneri, se reproduce pendiente Norte Alaska ha quintuplicado su presencia los últimos 25 años y ahora una las especies acuáticas reproducción más observadas nuestro sitio estudio planicie costera Arctic National Wildlife Refuge. Este crecimiento poblacional acelerado puede ofrecer nueva fuente alimentación depredadores huevos, impactando poblaciones depredadores,...
Abstract Addressing urgent conservation issues, like the drastic declines of North American migratory birds, requires creative, evidence-based, efficient, and collaborative approaches. Over 50% monitored shorebird populations have lost over their abundance since 1980. To address these declines, we developed a partnership scientists practitioners called Shorebird Science Conservation Collective (hereinafter “the Collective”). Here, present this successful case study as an example for others...
Migration allows birds to improve fitness by exploiting seasonal resource peaks and avoiding limitations. strategies may differ among individuals within a species, but for all strategies, the benefit of increased should outweigh costs migration. These can include mortality risk, time constraints in annual cycle, metabolic energy loss. We compared migratory chronology routes from broadly distributed species waterfowl, Lesser Scaup (<em>Aythya affinis</em>; hereafter Scaup), marked at northern...
Climate change is having a disproportionate impact on the Arctic. For Arctic breeding birds, basic knowledge of their annual cycle, specifically timing, route, and movement behavior migration, needed to understand when where populations may experience threats. We used combination geolocators stable isotope analysis identify route timing migration in Smith's Longspurs (<em>Calcarius pictus</em>) that breed Alaska's Brooks Range. trapped males grounds from 2011 2014 collected head feathers for...
ABSTRACT Identifying the migration routes and stopover sites used by declining species is critical for developing targeted conservation actions. Long-distance migratory shorebirds are among groups of birds most rapidly, yet we frequently lack detailed knowledge about they use during their hemisphere-spanning migrations. This especially true that migrate through mid-continental regions in Western Hemisphere. We therefore satellite transmitters to track 212 individuals 6 shorebird southward...