Download or read book Eastern Beaufort Sea Beluga Whales written by Canada. Department of Fisheries and Oceans. Central and Arctic Region and published by . This book was released on 2000 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 Beluga Whales in the Beaufort Sea maps written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of a Workshop on Beaufort Sea Beluga written by Wayne S. Duval and published by . This book was released on 1993 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Workshop held to examine the status of the stock of beluga whales that summer in the Beaufort Sea; to identify the best methods for the continued monitoring of the stock in response to human activities and environmental changes; and to define research priorities for the future. This document describes the structure of the workshop and its goals; gives background information on models; summarizes the subgroup discussions on stock status and population estimates and on continuing assessment; and discusses funding priorities, including the need for satellite tagging and aerial surveys.
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 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 Exploration of Grouping Characteristics and Spatial Distribution of Beluga Whales Delphinapterus Leucas in the Eastern Beaufort Sea written by Alexandra Mayette and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beluga whales (Delphinapterus leucas) are considered social whales, but like any other cetaceans, the study of social behaviour is challenging to conduct. Due to the wide distribution of the Eastern Beaufort Sea beluga whale population across its summering grounds, little is known about the large-scale grouping behaviour and spatial distribution of groups. The aim of this research is to explore the grouping characteristics and organization of beluga groups, as well as the habitat preference of different social groups in summer. First, we used aerial photographs captured in July 2019 to describe group size, age composition, inter-individual distance, and swimming direction of beluga groups. We compared characteristics between two key summer habitats: the extended offshore of the Beaufort Sea shelf and the inshore of the Mackenzie Estuary. Results showed that group size and inter-individual distance were similar in both habitats. The average distance in a group varied with age composition and the swimming direction varied between the offshore and inshore. Second, we used GPS locations of beluga sightings recorded by visual observers during aerial surveys conducted in July and August 2019. We investigated the distribution of three beluga social group types (individual belugas, groups of adults, and groups with calf) using hierarchical generalized additive models. The sea surface temperature, bathymetry, and slope described best the summer distribution. Areas of high preference were often associated with prey distribution, suggesting foraging as the main driver of habitat preference. We also hypothesized that body size energy requirements contributed to the variation between the group types. This study revealed for the first-time observations of grouping behaviour in the summer habitat of the Eastern Beaufort Sea beluga whales. Although the results do not reflect the extent and complexity of beluga social behaviour, this study now provides an information baseline for this beluga population. We also encourage multidisciplinary research as an opportunity to further collect data and explore other elements of beluga whale sociality.
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 The Pacific Arctic Region written by Jacqueline M. Grebmeier and published by Springer. This book was released on 2014-06-10 with total page 461 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Pacific Arctic region is experiencing rapid sea ice retreat, seawater warming, ocean acidification and biological response. Physical and biogeochemical modeling indicates the potential for step-function changes to the overall marine ecosystem. This synthesis book was coordinated within the Pacific Arctic Group, a network of international partners working in the Pacific Arctic. Chapter topics range from atmospheric and physical sciences to chemical processing and biological response to changing environmental conditions. Physical and biogeochemical modeling results highlight the need for data collection and interdisciplinary modeling activities to track and forecast the changing ecosystem of the Pacific Arctic with climate change.
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 The Interconnectedness of Diet Physiology and Physical Condition in Beluga Whales as a Sentinel Species for Environmental Change in the Beaufort Sea Ecosystem written by Emily Sarah Choy and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of a Workshop on Beaufort Sea Beluga written by Wayne S. Duval and published by . This book was released on 1900 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aerial Surveys of Endangered Whales in the Beaufort Sea Fall 1987 written by Stephen D. Treacy and published by . This book was released on 1989 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Workshop on Beaufort Sea Beluga written by Douglas Wartzok and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Beluga Caf My Strange Adventure with Art Music and Whales in the Far North written by Jim Nollman and published by . This book was released on 2002 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Animal communication expert Jim Nollman has sung with orcas, plucked a Jew's harp in waters teeming with humpback whales, and shaken rattles in the company of bottlenose dolphins. Now, in this heartfelt and quirky true adventure story, Nollman and two artist friends set out for Canada's vast Mackenzie Delta, electric guitar and underwater sound equipment in tow, to make music with belugas - the elusive white whales of the Arctic. Travelling the expanses of this beautiful northern land, the three friends unwittingly find themselves at the centre of a heated controversy over the Beaufort Sea belugas: Why have the whales stopped coming into the Mackenzie Delta, possibly jeopardizing their own calves, who live the first part of their lives in these shallow, warm waters? As they attempt to unravel the mystery, they encounter various intriguing characters now laying claim to the resources of the Mackenzie Delta region - Native people (who are allowed to hunt the whales ), wildlife officials, and oil company engineers - all vividly described by Nollman. Along the way, he also conveys both the wonders and the realities of being deep in the wilderness - experiencing the connectedness of all living things while scratching the bites of the world's most fearsome mosquitoes. With its rich and passionate nature writing evoking lovely and remote landscapes, The Beluga Caf suggests profound metaphors for our time about animal rights and animal intelligence, the role of science in conservation, the politics of extinction, and the place of art in the epic struggle to save the natural world.
