A5057483766- Avian ecology and behavior
- Marine animal studies overview
- Isotope Analysis in Ecology
- Animal Behavior and Reproduction
- Marine and fisheries research
- Arctic and Antarctic ice dynamics
- Mercury impact and mitigation studies
- Climate variability and models
- Bird parasitology and diseases
- Bat Biology and Ecology Studies
- Wildlife Ecology and Conservation
- Genetic and phenotypic traits in livestock
- Folate and B Vitamins Research
- Amphibian and Reptile Biology
- Effects and risks of endocrine disrupting chemicals
- Polar Research and Ecology
- Evolution and Paleontology Studies
- Remote Sensing and LiDAR Applications
- Archaeology and ancient environmental studies
- Microplastics and Plastic Pollution
- Physiological and biochemical adaptations
- Toxic Organic Pollutants Impact
- Heavy Metal Exposure and Toxicity
- Remote Sensing in Agriculture
- Arctic and Russian Policy Studies
University of Alaska Fairbanks
2014-2024
World Wildlife Fund
2023-2024
National Institute of Polar Research
2019-2022
Royal Manchester Children's Hospital
2002
Plastic pollution, and its associated impacts on marine fauna due to chemical contamination, is an area of growing global concern. We analyzed 145 preen gland oil samples from 32 seabird species belonging 8 families with different foraging habits life history strategies around the world for plastic additives legacy persistent organic pollutants. The included two brominated flame retardants (decabromodiphenyl ether, BDE209; decabromo diphenyl ethane, DBDPE) six benzotriazole UV stabilizers...
In nest-bound avian offspring, food shortages typically trigger a release of the stress hormone corticosterone (CORT). Recent studies indicate that CORT is passively deposited in tissue growing feathers and thus may provide an integrated measure incurred during development nest. The current hypothesis predicts that, assuming constant rate feather growth, elevated circulating blood corresponds to higher levels tissue, but experimental evidence for nutritionally stressed chicks lacking. Here,...
Abstract Partitioning of resources by competing species seabirds may increase during periods food shortages and elevated energy demands. Here, we examined whether resource partitioning (differential use foraging habitat or the consumption different prey species) between common murres ( COMU , Uria aalge ) thick‐billed TBMU U. lomvia breeding on same colony in Bering Sea increases with a predictable demands incubation chick‐rearing stages reproduction. We assessed seasonal dynamics...
Abstract Changes in climate and anthropogenic pressures might affect the composition abundance of forage fish world's oceans. The junk‐food hypothesis posits that dietary shifts quality (e.g., energy content) food available to marine predators may impact their physiological state consequently fitness. Previously, we experimentally validated deposition adrenocortical hormone, corticosterone, feathers is a sensitive measure nutritional stress seabirds. Here, use this method examine how changes...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 593:195-208 (2018) - DOI: https://doi.org/10.3354/meps12365 Inter-annual climate variability affects foraging behavior and nutritional state of thick-billed murres breeding in southeastern Bering Sea N. Kokubun1,2, A. Takahashi1,2,*, R. Paredes3, C. Young4,5, Sato2, T. Yamamoto1,6,7, D. M. Kikuchi2, E. V....
Abstract. Subarctic environmental changes are expected to affect the foraging ecology of marine top predators, but response such may vary among species if they use food resources differently. We examined characteristics behavior two sympatric congeneric diving seabird: common (Uria aalge: hereafter COMUs) and thick-billed (U. lomvia: TBMUs) murres breeding on St. George Island, located in seasonal sea-ice region Bering Sea. investigated their trip flight durations, diel patterns dive depth,...
We tested the hypothesis that segregation in wintering areas is associated with population differentiation a sentinel North Pacific seabird, rhinoceros auklet ( Cerorhinca monocerata ). collected tissue samples for genetic analyses on five breeding colonies western Ocean (Japan) and 13 eastern (California to Alaska), deployed light-level geolocator tags 12 delineate areas. Geolocator were previously one colony Japan. There was strong between populations vs. Ocean, likely due two factors....
Abstract Measuring corticosterone in feathers has become an informative tool avian ecology, enabling researchers to investigate carry‐over effects and responses environmental variability. Few studies have, however, explored whether is the only hormone expressed most indicative of stress. Essential questions remain as how compare concentrations across different types preening adds steroids, applied after feather growth. We used liquid chromatography coupled tandem mass spectrometry quantify a...
Marine methylmercury concentrations vary geographically and with depth, exposing organisms to different mercury levels in habitats. Red-legged kittiwakes (Rissa brevirostris), a specialist predator, forage on fish invertebrates from the mesopelagic zone, part of ocean elevated concentrations. We used as bioindicators MeHg remote systems by examining how wintering distribution habitat affected kittiwakes' exposure. In 2011-2017, we sampled winter-grown feathers St. George Island, Alaska,...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 533:261-276 (2015) - DOI: https://doi.org/10.3354/meps11388 Foraging ecology during nesting influences body size in a pursuit-diving seabird Rosana Paredes1,*, Rachael A. Orben2, Daniel D. Roby3, David B. Irons4, Rebecca Young5, Heather Renner6, Yann Tremblay7, Alexis Will5, Ann M. Harding8, Alexander S....
Multi-colony studies of breeding seabirds may provide insights into the mechanistic links between large-scale climate variability and local changes in prey availability. In North Pacific, Pacific Decadal Oscillation (PDO) is a dominant index characterized by contrasting patterns sea surface temperature western eastern Pacific. To examine how inter-annual PDO affects rhinoceros auklets Cerorhinca monocerata across we measured nutritional stress (as reflected plasma levels corticosterone)...
Abstract. Seasonal sea-ice cover has been decreasing in the southeastern Bering Sea shelf, which might affect ecosystem dynamics and availability of food resources to marine top predators breeding region. In this study, we investigated foraging responses two seabird species, surface-foraging red-legged kittiwakes Rissa brevirostris (hereafter, RLKI) pursuit-diving thick-billed murres Uria lomvia (TBMU) different environmental conditions over 2 years. At-sea distributions RLKI TBMU on St....
Determinants of individual variation in reallocation limited resources towards self-maintenance versus reproduction are not well known. We tested the hypothesis that heterogeneity long-term ‘somatic state’ (i) explains endocrine and behavioural responses to environmental challenges, (ii) is associated with strategies for allocating reproduction. used relative telomere length as an indicator somatic state experimentally generated abrupt short-term reduction food availability (withdrawal...
Abstract. Sub-arctic environmental changes are expected to affect the ecology of marine top predators. We examined characteristics foraging behavior two sympatric congeneric diving seabirds, common (Uria aalge: hereafter COMU) and thick-billed (U. lomvia: TBMU) murres breeding on St. George Island located in seasonal sea-ice region Bering Sea. investigated their flight duration, diel patterns dive depth, underwater wing strokes, along with morphology blood stable isotopes....
Abstract. Seasonal sea-ice cover has been decreasing in the southeastern Bering Sea shelf, which might affect ecosystem dynamics and availability of food resources to marine top predators breeding region. In this study, we investigated foraging responses two seabird species, surface-foraging red-legged kittiwakes Rissa brevirostris (hereafter, RLKI) pursuit-diving thick-billed murres Uria lomvia (TBMU) inter-annual change environmental conditions. Between study years, winter ice retreated...
In birds, patterns of development the adrenocortical response to stressors vary among individuals, types stressors, and species. Since there are benefits costs exposure elevated glucocorticoids, this variation is presumably a product selection such that animals modulate glucocorticoid secretion in contexts where doing so increases their fitness. study, we evaluated hypothalamic-pituitary-adrenal (HPA) activity first-hatched free-living seabird nestlings (black-legged kittiwakes, Rissa...
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...