A5038539563- Marine animal studies overview
- Marine and fisheries research
- Cephalopods and Marine Biology
- Isotope Analysis in Ecology
- Arctic and Antarctic ice dynamics
- Meat and Animal Product Quality
- Fish Ecology and Management Studies
- Cryospheric studies and observations
- Reproductive biology and impacts on aquatic species
- Marine and coastal ecosystems
- Coral and Marine Ecosystems Studies
- Toxic Organic Pollutants Impact
- Marine and coastal plant biology
- Ichthyology and Marine Biology
- Marine Toxins and Detection Methods
- Wildlife Ecology and Conservation
- Mercury impact and mitigation studies
- Marine Bivalve and Aquaculture Studies
- Bat Biology and Ecology Studies
- Animal Behavior and Welfare Studies
National Oceanic and Atmospheric Administration
2025
NOAA National Marine Fisheries Service Northwest Fisheries Science Center
2025
Florida Aquarium
2025
Baylor University
2018-2023
Alaska Department of Fish and Game
2020-2022
University of Alaska Fairbanks
2018-2020
Abstract Chemical analysis of calcified structures continues to flourish, as analytical and technological advances enable researchers tap into trace elements isotopes taken up in otoliths other archival tissues at ever greater resolution. Increasingly, these tracers are applied refine age estimation interpretation, chronicle responses environmental stressors, linking ecological, physiological, life-history processes. Here, we review emerging approaches innovative research directions otolith...
Clams are efficient vectors of potent algal neurotoxins, a suite saxitoxin (STX) congeners collectively called paralytic shellfish toxins (PSTs), to higher trophic levels. The Alaskan Arctic is region facing an expanding threat from PSTs due ocean warming, yet little known about in clams this region. Quantifying total toxicity bivalves requires analytical techniques, such as high-performance liquid chromatography (HPLC). Enzyme-linked immunosorbent assays (ELISAs) but only semi-quantitative...
ABSTRACT In August 2024, a northern fur seal mortality event was observed on St. Paul Island, AK in the southeast (SE) Bering Sea. Ten seals good body condition were found dead along with large accumulations of fish Benson Beach located Island. Full necropsies five available adult seals, one pup, and several did not reveal any overt causes death. Testing tissues for algal neurotoxins domoic acid (DA) saxitoxin (STX) confirmed presence STX multiple physiological exposure all NFS two testing....
A liquid chromatography/tandem mass spectrometry (LC/MS/MS) method was validated and utilized to measure analyze four steroid hormones related stress reproduction in individual samples from a novel tissue, Pacific walrus (Odobenus rosmarus divergens, herein walrus) bone. This determines hormone concentrations the remote population over millennia archaeological (>200 bp), historical (200-20 modern (2014-2016) time periods.Lipids were extracted bone collected these periods using methanol...
Abstract Keratinized tissues, including whiskers, are ideal for acquiring a record of physiological parameters. Most tissues provide snapshot status; however, whiskers may support longitudinal sampling reproductive and stress-related hormones, if hormones incorporated as grow concentrations change with state. Whiskers from female Steller sea lions (Eumetopias jubatus) northern fur seals (Callorhinus ursinus) were serially sectioned pulverized steroid extracted. Standard methods used to...
Assessing the physiological impact of stressors in pinnipeds is logistically challenging, and many hormones are altered by capture handling, limiting utility metabolically active tissues. Hair increasingly being used to investigate stress-related reproductive wildlife populations due less-invasive collection methods, inert once grown containing multiple biomarkers ecological interest. We validated enzyme immunoassays for measuring aldosterone, cortisol, corticosterone, testosterone lanugo...
Fisheries management relies on accurate population models for estimating biomass and setting harvest goals; however, physiological data reproductive parameters in are difficult to acquire. Here, lifetime (progesterone estradiol) stress-related (cortisol) hormones were measured annually deposited growth increments female yelloweye rockfish ( Sebastes ruberrimus) opercula N = 22 females, sampled ages 1–90 years). Analyses of these profiles (∼1-year resolution) provided estimates (complete...
The Pacific walrus (Odobenus rosmarus divergens) is an iconic Arctic marine mammal and important resource to many Alaska Natives. A decrease in sea ice habitat unknown population numbers has led concern of the long-term future health population. There currently no clear understanding how physiology might be affected by a changing ecosystem. In this study, steroid hormone concentrations (progesterone, testosterone, cortisol estradiol) were analysed bones collected during archaeological...
Abstract The use of keratinized tissues (e.g., hair, claws) to investigate physiological effects environmental and anthropogenic stressors in free‐ranging wildlife populations has increased because these retain steroid hormones during growth are relatively easy collect store the field. We measured reproductive stress‐related wolves ( Canis lupus ligoni ; n = 31) captured on Prince Wales Island, Alaska, USA, 1993–1994 2012–2014, representing periods time when both wolf harvest densities...
1. Apex predators are typically considered dietary generalists; often masking individual variability. However, specialization—consistent differences in diet and foraging strategies among individuals— is common apex predators. In some species, only a few specialized individuals can significantly impact prey populations. 2. Leopard seals (Hydrurga leptonyx) important to the structure function of Southern Ocean ecosystem. broadly described as generalists, but little known about their trophic...
Abstract Climate change threatens fisheries health through changing ecosystem dynamics; however, the impacts on physiology and ecology of commercial fish populations are unclear. Here, annually deposited growth increments female yelloweye rockfish (Sebastes ruberrimus) opercula collected in Gulf Alaska were used to successfully reconstruct lifetime (∼1-year resolution) steroid hormone, stable isotope, spawning, stress data. We assessed how hormone profiles, spawning distress frequencies...