Download or read book Mercury in Beluga Whales in the Canadian Beaufort Sea written by David M. Rosenberg and published by . This book was released on 2003 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Beaufort Sea Beluga Whales written by Lisa Lucia Loseto and published by . This book was released on 2007 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Mercury (Hg) levels in the Beaufort Sea beluga (Delphinapterus leucas) population have been increasing since the 1990's. Ultimately, it is the Hg content of prey that determines beluga Hg levels. However, the Beaufort Sea beluga diet is not understood, and little is known about the food webs and Hg sources in their summer habitat. Using satellite telemetry data, the Beaufort Sea Beluga were found to segregate into habitat use groups, by length, sex and reproductive status. Segregation of habitat use lead to the hypothesis that beluga may feed differently, explaining Hg dietary sources. Mercury levels were measured in three food webs in the western Canadian Arctic to assess their dietary Hg contribution. Results revealed that potential beluga prey had variable Hg concentrations. With the use of the diet biomarkers stable isotopes and fatty acids in both prey items and beluga, the beluga diet was evaluated by incorporating beluga biological variables such as age, length, sex and harvest location. Here, we show the factors driving beluga diet variability lead to differences in dietary Hg uptake. Diet variability within the Beaufort Sea beluga was evident, whereby larger beluga appeared to feed predominantly on offshore arctic cod (Boreogadus Saida), and medium and smaller sized beluga incorporated more near-shore fish collected from the Mackenzie shelf. The variation in beluga diet was supported by the differences in Hg concentrations and 815N values in both prey and beluga. For the first time, we demonstrate that food web Hg biomagnification processes drive beluga muscle Hg levels, rather than Hg bioaccumulation over time. This conclusion revealed that dietary Hg levels varied with habitat use, where the shelf was low source of Hg and the offshore was a high source. Therefor, incorporating beluga habitat use along with food web complexity was important in determining the factors driving beluga Hg levels. These observations lend support to the possibility that the high levels of Hg leaving the Mackenzie River only become bioavailability for food web uptake once entering offshore habitats"--Leaves [i]-ii.
Download or read book Beaufort Sea Beluga Whales written by Lisa Lucia Loseto and published by . This book was released on 2007 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Mercury (Hg) levels in the Beaufort Sea beluga (Delphinapterus leucas) population have been increasing since the 1990's. Ultimately, it is the Hg content of prey that determines beluga Hg levels. However, the Beaufort Sea beluga diet is not understood, and little is known about the food webs and Hg sources in their summer habitat. Using satellite telemetry data, the Beaufort Sea Beluga were found to segregate into habitat use groups, by length, sex and reproductive status. Segregation of habitat use lead to the hypothesis that beluga may feed differently, explaining Hg dietary sources. Mercury levels were measured in three food webs in the western Canadian Arctic to assess their dietary Hg contribution. Results revealed that potential beluga prey had variable Hg concentrations. With the use of the diet biomarkers stable isotopes and fatty acids in both prey items and beluga, the beluga diet was evaluated by incorporating beluga biological variables such as age, length, sex and harvest location. Here, we show the factors driving beluga diet variability lead to differences in dietary Hg uptake. Diet variability within the Beaufort Sea beluga was evident, whereby larger beluga appeared to feed predominantly on offshore arctic cod (Boreogadus Saida), and medium and smaller sized beluga incorporated more near-shore fish collected from the Mackenzie shelf. The variation in beluga diet was supported by the differences in Hg concentrations and 815N values in both prey and beluga. For the first time, we demonstrate that food web Hg biomagnification processes drive beluga muscle Hg levels, rather than Hg bioaccumulation over time. This conclusion revealed that dietary Hg levels varied with habitat use, where the shelf was low source of Hg and the offshore was a high source. Therefor, incorporating beluga habitat use along with food web complexity was important in determining the factors driving beluga Hg levels. These observations lend support to the possibility that the high levels of Hg leaving the Mackenzie River only become bioavailability for food web uptake once entering offshore habitats"--Leaves [i]-ii
Download or read book Seasonal Movement and Habitat Use of Beluga Whales in the Canadian Beaufort Sea written by Claire Hornby (Alexandra) and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Research on the Beluga Whale Delphinapterus Leucas written by Thomas G. Smith and published by . This book was released on 1990 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Collection of 14 articles representing a cross-section of current research on beluga whales, Delphinapterus leucas, in North American waters.
Download or read book Toxicology of Marine Mammals written by Joseph G. Vos and published by CRC Press. This book was released on 2002-12-05 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt: The activities of modern society have unleashed a range of toxic chemicals into the global environment. Many of these toxicants are now being detected in increasing quantities in the tissues of marine mammals, most notably in top predators who acquire relatively large amounts of toxic chemicals by ingesting contaminated prey. Toxicology of M
Download or read book Environmental Contaminants in Biota written by W. Nelson Beyer and published by CRC Press. This book was released on 2011-02-23 with total page 1040 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discussing the interpretation of tissue concentrations of contaminants in wildlife, this updated edition of a bestseller draws on current scientific research and includes new chapters and greater emphasis on aquatic organisms. Each chapter provides a summary and review of a specific chemical along with direction on research methods and the interpretation of conflicting or insufficient data. Chapters include a comprehensive history of contaminant interpretation in wildlife and fish, the use of tissue residues in ecological risk assessment, and detailed coverage of all bioaccumulative contaminants and their physiologic affects.
Download or read book Beluga Whales written by Anthony R. Martin and published by . This book was released on 2002 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dr Anthony Martin is a biologist and in this book he explores what we know about the beluga or white whale, and relates to the reader what research is currently being carried out on this species.
Download or read book Eighth International Conference on Mercury as a Global Pollutant Madison Wisconsin August 6 11 2006 written by and published by Destech Publications. This book was released on 2006 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Little Less Arctic written by Steven H. Ferguson and published by Springer Science & Business Media. This book was released on 2010-05-30 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Arctic Canada, Hudson Bay is a site of great exploration history, aboriginal culture, and a vast marine wilderness supporting large populations of marine mammals and birds. These include some of the most iconic Arctic animals like beluga, narwhal, bowhead whales, and polar bears. Due to the challenges of conducting field research in this region, some of the mysteries of where these animals move, and how they are able to survive in such seemingly inhospitable, ice-choked habitats are just now being unlocked. For example, are polar bears being replaced by killer whales? This new information could not be more salient, as the Hudson Bay Region is undergoing rapid environmental change due to global warming, as well as increased pressures from industrial development interests. A Little Less Arctic brings together some of the world’s leading Arctic scientists to present the current state of knowledge on the physical and biological characteristics of Hudson Bay.
Download or read book Assessing the Neurotoxicological Risk of Methylmercury Exposure for Beluga Whales Delphinapterus Leucas Harvested in the Mackenzie Delta Estuary written by Sonja Kerstin Ostertag and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Arctic marine mammals are exposed to numerous environmental contaminants and some of these compounds are known to damage mammalian nervous systems. Three methods were used to assess neurotoxicological risk of methylmercury (MeHg) exposure for beluga whales (Delphinapterus leucas) in the eastern Beaufort Sea population: characterization of mercury (Hg) accumulation and speciation in brain tissue, neurochemical and molecular biomarkers, and behavioural observations. To conduct this research, I worked closely with the communities of Tuktoyaktuk, NT and Inuvik, NT to conduct three field-sampling seasons on Hendrickson Island, NT, which is a traditional beluga-harvesting site used by Inuvialuit. ...The weight of evidence based on the outcomes from these studies suggests that MeHg exposure may be of toxicological concern for beluga whales from the Eastern Beaufort Sea population. The implications of MeHg-exposure for beluga whales from the eastern Beaufort Sea population at both physiological and population levels are still unclear."--Leaves iii-iv.
Download or read book Arctic Research of the United States written by and published by . This book was released on 1997 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Beaufort Sea Planning Area written by and published by . This book was released on 1990 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The State of Canada s Environment written by and published by . This book was released on 1991 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt: Second national state-of-the-environment report, addressing the questions of what is happening in Canada's environment, why it is happening, why it is significant, and what Canadians are doing about it. The report is divided into five parts, dealing with perceptions of the environment and the dangers inherent in our tendency to look at the world in terms of human economic models; exploring the state of particular environmental components and the major sectors of human activity; describing six regional case studies; addressing six important environmental issues; and discussing the concept of sustainable development and its implications for Canada's future.
Download or read book Beluga Whales written by Ruth Owen and published by The Rosen Publishing Group, Inc. This book was released on 2013-01-15 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes the physical characteristics, life cycle, and natural environment of beluga whales, and the ways in which they have adapted to their frigid environment.
Download or read book CRC Handbook of Marine Mammal Medicine written by Frances M.D. Gulland and published by CRC Press. This book was released on 2018-03-20 with total page 2192 pages. Available in PDF, EPUB and Kindle. Book excerpt: AAP Prose Award Finalist 2018/19 For three decades, this book has been acknowledged as the most respected scientific reference specifically devoted to marine mammal medicine and health. Written by approximately 100 contributors who are recognized globally as leaders in their respective fields, the CRC Handbook of Marine Mammal Medicine, Third Edition continues to serve as the essential guide for all practitioners involved with marine mammals including veterinarians, technicians, biological researchers, students, managers, keepers, curators, and trainers. The 45 chapters provide essential information for the practitioner on pathology, infectious diseases, medical treatment, anesthesia, surgery, husbandry, health assessment, species-specific medicine, medically pertinent anatomy and physiology, and global health concerns such as strandings, oil spills, and entanglements of marine mammals. Covers all aspects of marine mammal veterinary practice Written by internationally acknowledged experts Adds new chapters on Ophthalmology, Dentistry, Ethics, Oil Spill Response, Health Assessments, Whale Entanglement Response, Dive Response, and Biotoxins Richly illustrated in color throughout the new edition including updated anatomical drawings and extensive photographs of ocular lesions Provides guidance to websites that regularly present updated information and images pertinent to current marine mammal medicine such as imaging and stranding network contacts Discusses ethics and animal welfare. The book guides the reader through the veterinary care of cetaceans, pinnipeds, manatees, sea otters, and polar bears. In addition to summaries of current knowledge, chapters provide information on those digital resources and websites which present the latest information as it emerges in the field. The CRC Handbook of Marine Mammal Medicine, Third Edition gives a call to action for scientists to experiment with new endeavors to engage and inspire current and future generations to care for marine mammals and the marine environment, and work together to find solutions. As the most trusted reference for marine mammal conservation medicine and for marine mammal medical facilities around the world, this book needs to be in your library.
Download or read book Status Report on the Beluga White Whale in the Beaufort Sea Delphinapterus Leucas in Canada written by Finley, K. J and published by . This book was released on 1990* with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
