James Roth results 57
· Newest (Page 1/3, per page 25)
Author: James Roth ×Clear All Filters
Search Results
Introduction Understanding migration timing and movement behavior is critical for predicting population responses to environmental changes. The beluga whale ( Delphinapterus leucas ) population in Cumberland Sound, Nunavut, is currently endangered due to historical and ongoing overharvesting. Methods By comparing satellite telemetry data from two distinct time periods (1998–1999 and 2006–2008), we evaluated beluga whale dive b...
Addressing urgent conservation issues, such as the drastic declines of North American migratory birds, requires creative, evidence‐based, efficient, and collaborative approaches. The abundance of over 50% of monitored North American shorebird populations has declined by over 50% since 1980. To address these declines, we developed a partnership of scientists and practitioners called the Shorebird Science and Conservation Collec...
Ocean acidification (OA) generally receives far less consideration than other climate stressors and related hazards, such as global warming and extreme weather events. Canada is uniquely vulnerable to OA given its extensive coastal oceans, the oceanographic processes in its three basins, accelerated warming and sea-ice melt, and extensive coastal communities and maritime economic sectors. Canada’s coastline is also home to ext...
The Toxicology Investigators Consortium 2024 Annual ReportNARA Subscribed
Marine resources alter tundra food web dynamics by subsidizing a terrestrial predator on the sea iceNARA Subscribed
Predator use of resource subsidies can strengthen top‐down effects on prey when predators respond numerically to subsidies. Although allochthonous subsidies are generally transported along natural gradients, consumers can cross ecosystem boundaries to acquire subsidies, thereby linking disparate ecosystems. In coastal Arctic ecosystems, terrestrial predators like Arctic foxes ( Vulpes lagopus ) cross into the marine environmen...
Centenarians—the way to healthy vascular ageing and longevity: a review from VascAgeNetNARA Subscribed
The prevalence of centenarians, people who lived 100 years and longer, is steadily growing in the last decades. This exceptional longevity is based on multifaceted processes influenced by a combination of intrinsic and extrinsic factors such as sex, (epi-)genetic factors, gut microbiota, cellular metabolism, exposure to oxidative stress, immune status, cardiovascular risk factors, environmental factors, and lifestyle behavior....
The Toxicology Investigators Consortium 2023 Annual ReportNARA Subscribed
Evaluating the use of marine subsidies by Arctic foxes without direct coastal access; insights from stable isotopesNARA Subscribed
The trophic structures of tundra ecosystems are often viewed as a result of local terrestrial primary productivity. However, other resources can be brought in through long-distant migrants or be directly accessible in coastal areas. Hence, trophic structures may deviate from predictions based on local terrestrial resources. The Arctic fox ( Vulpes lagopus ) is a small canid that may use marine resources when available. We used...
The fundamental goal of a rare plant translocation is to create self‐sustaining populations with the evolutionary resilience to persist in the long term. Yet, most plant translocation syntheses focus on a few factors influencing short‐term benchmarks of success (e.g., survival and reproduction). Short‐term benchmarks can be misleading when trying to infer future growth and viability because the factors that promote establishme...
Trophic Structure and a Temporal Shift in Trophic Diversity of Mobile Consumers in a Subarctic EstuaryNARA Subscribed
Quantifying trophic relationships within and between species in terms of trophic position, ontogeny and trophic diversity provides information on community-level structure and function. Little attention has been focused on examining the trophic structure and temporal changes of communities in freshwater-marine coupled systems in the subarctic and associated impacts of anthropogenic activity on trophic interactions. Therefore,...
Limiting disturbance in critical habitats is an important part of ensuring the well-being and sustainability of populations at risk, such as Cumberland Sound beluga whales ( Delphinapterus leucas ). Using non-disruptive Very High Resolution (VHR) satellite imagery, an emerging tool in cetacean monitoring, we aimed to estimate summer abundance and identify critical habitat for Cumberland Sound beluga whales. Specifically we loo...
The Toxicology Investigators Consortium 2022 Annual ReportNARA Subscribed
Comparing growth and body condition of wild and hatchery M YY brook trout in streams and alpine lakesNARA Subscribed
Biologists have theorized that stocking YY males (created via in‐hatchery hormonal sex‐reversal and selective breeding; hereafter M YY fish) could be used to eradicate unwanted non‐native vertebrate populations, but little is known about the fitness of M YY individuals once released into the wild. We compared growth and body condition of stocked hatchery‐reared M YY brook trout ( Salvelinus fontinalis Mitchell) to wild conspec...