Karyn D. Rode
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View article: The importance of method selection when estimating diet composition with quantitative fatty acid signature analysis
The importance of method selection when estimating diet composition with quantitative fatty acid signature analysis Open
Quantitative fatty acid signature analysis (QFASA) is a common method of estimating the composition of prey species in the diets of consumers from polar and temperate ecosystems in which lipids are an important source of energy. A key char…
View article: Hair growth rate estimation in North American ursids
Hair growth rate estimation in North American ursids Open
The feeding ecology of wildlife populations has important implications for individual health, population productivity and distribution patterns. For ursids (bears), food resources and feeding behaviour primarily affect population dynamics …
View article: Increased pathogen exposure of a marine apex predator over three decades
Increased pathogen exposure of a marine apex predator over three decades Open
Environmental changes associated with global warming create new opportunities for pathogen and parasite transmission in Arctic wildlife. As an apex predator ranging over large, remote areas, changes in pathogens and parasites in polar bear…
View article: The post-emergence period for denning Polar Bears: phenology and influence on cub survival
The post-emergence period for denning Polar Bears: phenology and influence on cub survival Open
Among polar bears (Ursus maritimus), only parturient females den for extended periods, emerging from maternal dens in spring after having substantially depleted their energy reserves during a fast that can exceed 8 months. Although den eme…
View article: Ursids evolved dietary diversity without major alterations in metabolic rates
Ursids evolved dietary diversity without major alterations in metabolic rates Open
The diets of the eight species of ursids range from carnivory (e.g., polar bears, Ursus maritimus ) to insectivory (e.g., sloth bears, Melursus ursinus ), omnivory (e.g., brown bears, U. arctos ), and herbivory (e.g., giant pandas, Ailurop…
View article: Polar bear energetic and behavioral strategies on land with implications for surviving the ice-free period
Polar bear energetic and behavioral strategies on land with implications for surviving the ice-free period Open
Declining Arctic sea ice is increasing polar bear land use. Polar bears on land are thought to minimize activity to conserve energy. Here, we measure the daily energy expenditure (DEE), diet, behavior, movement, and body composition change…
View article: Identifying indicators of polar bear population status
Identifying indicators of polar bear population status Open
Monitoring trends in large mammal populations is a fundamental component of wildlife management and conservation. However, direct estimates of population size and vital rates of large mammals can be logistically challenging and expensive. …
View article: Effects of feeding and habitat on resting metabolic rates of the Pacific walrus
Effects of feeding and habitat on resting metabolic rates of the Pacific walrus Open
Arctic marine mammals live in a rapidly changing environment due to the amplified effects of global warming. Pacific walruses ( Odobenus rosmarus divergens ) have responded to declines in Arctic sea‐ice extent by increasingly hauling out o…
View article: Forecasts of polar bear (Ursus maritimus) land use in the southern Beaufort and Chukchi Seas, 2040–65
Forecasts of polar bear (Ursus maritimus) land use in the southern Beaufort and Chukchi Seas, 2040–65 Open
First posted July 14, 2023 For additional information, contact: Director, Alaska Science CenterU.S. Geological Survey4210 University DriveAnchorage, Alaska 99508 This report provides analysis to extend the 2040 forecasts of polar bear (Urs…
View article: Observed and forecasted changes in land use by polar bears in the Beaufort and Chukchi Seas, 1985–2040
Observed and forecasted changes in land use by polar bears in the Beaufort and Chukchi Seas, 1985–2040 Open
Monitoring changes in the distribution of large carnivores is important for managing human safety and supporting conservation. Throughout much of their range, polar bears (Ursus maritimus) are increasingly using terrestrial habitats in res…
View article: Diet energy density estimated from isotopes in predator hair associated with survival, habitat, and population dynamics
Diet energy density estimated from isotopes in predator hair associated with survival, habitat, and population dynamics Open
Sea ice loss is fundamentally altering the Arctic marine environment. Yet there is a paucity of data on the adaptability of food webs to ecosystem change, including predator–prey interactions. Polar bears ( Ursus maritimus ) are an importa…
View article: The Role of Satellite Telemetry Data in 21st Century Conservation of Polar Bears (Ursus maritimus)
The Role of Satellite Telemetry Data in 21st Century Conservation of Polar Bears (Ursus maritimus) Open
Satellite telemetry (ST) has played a critical role in the management and conservation of polar bears ( Ursus maritimus ) over the last 50 years. ST data provide biological information relevant to subpopulation delineation, movements, habi…
View article: Long-term variation in polar bear body condition and maternal investment relative to a changing environment
Long-term variation in polar bear body condition and maternal investment relative to a changing environment Open
In the Arctic, warming air and ocean temperatures have resulted in substantial changes to sea ice, which is primary habitat for polar bears (Ursus maritimus). Reductions in extent, duration, and thickness have altered sea ice dynamics, whi…
View article: Subsurface swimming and stationary diving are metabolically cheap in adult Pacific walruses (<i>Odobenus rosmarus divergens</i>)
Subsurface swimming and stationary diving are metabolically cheap in adult Pacific walruses (<i>Odobenus rosmarus divergens</i>) Open
Walruses rely on sea-ice to efficiently forage and rest between diving bouts while maintaining proximity to prime foraging habitat. Recent declines in summer sea ice have resulted in walruses hauling out on land where they have to travel f…
View article: Iñupiaq Knowledge of Polar Bears (<i>Ursus maritimus</i>) in the Southern Beaufort Sea, Alaska
Iñupiaq Knowledge of Polar Bears (<i>Ursus maritimus</i>) in the Southern Beaufort Sea, Alaska Open
Successful wildlife management depends upon coordination and consultation with local communities. However, much of the research used to inform management is often derived solely from data collected directly from wildlife. Indigenous people…
View article: Demographic risk assessment for a harvested species threatened by climate change: polar bears in the Chukchi Sea
Demographic risk assessment for a harvested species threatened by climate change: polar bears in the Chukchi Sea Open
Climate change threatens global biodiversity. Many species vulnerable to climate change are important to humans for nutritional, cultural, and economic reasons. Polar bears Ursus maritimus are threatened by sea‐ice loss and represent a sub…
View article: Code for "Demographic risk assessment for a harvested species threatened by climate change: polar bears in the Chukchi Sea"
Code for "Demographic risk assessment for a harvested species threatened by climate change: polar bears in the Chukchi Sea" Open
Code in the R programming language for the manuscript "Demographic risk assessment for a harvested species threatened by climate change: polar bears in the Chukchi Sea".
View article: Carbon and Nitrogen Isotope Concentrations in Polar Bear Hair and Prey from the Alaska Beaufort and Chukchi Seas, 1978-2019
Carbon and Nitrogen Isotope Concentrations in Polar Bear Hair and Prey from the Alaska Beaufort and Chukchi Seas, 1978-2019 Open
This dataset includes carbon and nitrogen isotope concentrations measured in polar bear hair and marine mammal prey samples collected 1978-2017 in the Beaufort and Chukchi Seas. Marine mammal prey samples were collected opportunistically e…
View article: Bears of the World
Bears of the World Open
Bears have fascinated people since ancient times. The relationship between bears and humans dates back thousands of years, during which time we have also competed with bears for shelter and food. In modern times, bears have come under pres…
View article: Identifying reliable indicators of fitness in polar bears
Identifying reliable indicators of fitness in polar bears Open
Animal structural body size and condition are often measured to evaluate individual health, identify responses to environmental change and food availability, and relate food availability to effects on reproduction and survival. A variety o…
View article: Measurement Data of Polar Bears Captured in the Chukchi and Southern Beaufort Sea, 1981-2017
Measurement Data of Polar Bears Captured in the Chukchi and Southern Beaufort Sea, 1981-2017 Open
This dataset includes measures collected on polar bears captured in the Chukchi and Beaufort Seas, 1981-2017 by the U.S. Geological Survey and U.S. Fish and Wildlife Service. Data collected include body length, body mass, axillary girth, s…
View article: Accelerometer Data from Collared Female Polar Bears in the Beaufort Sea, 2009-2016
Accelerometer Data from Collared Female Polar Bears in the Beaufort Sea, 2009-2016 Open
This dataset includes accelerometer data collected on collars deployed on female polar bears in the southern Beaufort Sea from 2009-2016. The accelerometer was built in to collars by Telonics, Inc. and provides a single activity value of t…
View article: Catalogue of polar bear (Ursus maritimus) maternal den locations in the Beaufort and Chukchi Seas and nearby areas, 1910–2018
Catalogue of polar bear (Ursus maritimus) maternal den locations in the Beaufort and Chukchi Seas and nearby areas, 1910–2018 Open
First posted January 27, 2020 For additional information, contact: Regional Director, AlaskaU.S. Geological Survey4210 University DriveAnchorage, Alaska 99508-4560 This report presents data on the approximate locations and methods of disco…
View article: Data from a Circumpolar Survey on Recreational Activities in Polar Bear Habitat, 2017-2018
Data from a Circumpolar Survey on Recreational Activities in Polar Bear Habitat, 2017-2018 Open
These data are the responses of researchers, managers, community members, and tour guides who live or work in polar bear habitats anywhere within their range to inquiries about the types, frequency, and potential impacts of recreational ac…
View article: High-energy, high-fat lifestyle challenges an Arctic apex predator, the polar bear
High-energy, high-fat lifestyle challenges an Arctic apex predator, the polar bear Open
A demanding lifestyle Polar bears appear to be well adapted to the extreme conditions of their Arctic habitat. Pagano et al. , however, show that the energy balance in this harsh environment is narrower than we might expect (see the Perspe…