The Status of Pacific Walrus (Odobenus Rosmarus Divergens) Foraging Habitat and Diet Around St. Lawrence Island PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download The Status of Pacific Walrus (Odobenus Rosmarus Divergens) Foraging Habitat and Diet Around St. Lawrence Island PDF full book. Access full book title The Status of Pacific Walrus (Odobenus Rosmarus Divergens) Foraging Habitat and Diet Around St. Lawrence Island by Tracie E. Merrill. Download full books in PDF and EPUB format.
Author: Tracie E. Merrill Publisher: ISBN: Category : Walrus Languages : en Pages : 196
Book Description
"With ongoing climate change, food resources may be reduced for Pacific walruses (Odobenus rosmarus divergens). Significant differences in walrus foraging habitat (benthic communities) or diet might indicate changes in prey quality or quantity. In this study, benthic infaunal biomass, abundance, and composition were compared between 1970-1974 and 2006 at stations southwest of St. Lawrence Island. Sediment grain size was compared because it strongly determines benthic community structure. Wet weights, counts, and species composition of prey items found in stomachs of walruses collected near the island were compared between the 1980s and 2007. Benthic invertebrate biomass and abundance increased mainly due to high Nuculidae biomass and abundance, although results may be skewed by low sample size. Silt fractions increased regionally. No significant dietary differences were detected in walruses. Walruses may have undergone a population redistribution or decline in response to benthic community changes that would be undetected in stomach content analyses"--Leaf iii.
Author: Tracie E. Merrill Publisher: ISBN: Category : Walrus Languages : en Pages : 196
Book Description
"With ongoing climate change, food resources may be reduced for Pacific walruses (Odobenus rosmarus divergens). Significant differences in walrus foraging habitat (benthic communities) or diet might indicate changes in prey quality or quantity. In this study, benthic infaunal biomass, abundance, and composition were compared between 1970-1974 and 2006 at stations southwest of St. Lawrence Island. Sediment grain size was compared because it strongly determines benthic community structure. Wet weights, counts, and species composition of prey items found in stomachs of walruses collected near the island were compared between the 1980s and 2007. Benthic invertebrate biomass and abundance increased mainly due to high Nuculidae biomass and abundance, although results may be skewed by low sample size. Silt fractions increased regionally. No significant dietary differences were detected in walruses. Walruses may have undergone a population redistribution or decline in response to benthic community changes that would be undetected in stomach content analyses"--Leaf iii.
Author: Chadwick V. Jay Publisher: ISBN: Category : Sea ice Languages : en Pages : 90
Book Description
A Bayesian network model was developed to analyze potential effects of changing environmental conditions and human-caused stressors on the future status of the Pacific walrus through the twenty-first century. This report was written to focus new research and monitoring efforts as well as to aid a review of walrus status that was prompted by the U.S. Fish and Wildlife Service in 2009 to determine if listing the subspecies as threatened or endangered is warranted under the Endangered Species Act. This government concern was raised due to climate warming and reductions in sea ice habitats.
Author: U.S. Fish and Wildlife Service. Region 7. Marine Mammals Management Publisher: ISBN: Category : Marine mammal populations Languages : en Pages : 20
Author: Xénia Keighley Publisher: Academic Press ISBN: 0128174315 Category : Nature Languages : en Pages : 359
Book Description
The Atlantic Walrus: Multidisciplinary insights into human-animal interactions addresses the key dimensions of long-term human walrus interactions across the Atlantic Arctic and subarctic regions, over the past millennia. This book brings together research from across the social and natural sciences to explore walrus biology, human culture, environmental conditions and their reciprocal effects. Together, 13 chapters of this book reconstruct the early evolution of walruses, walrus biology, the cultural significance and ecological impact of prehistoric and indigenous hunting practices, as well as the effects of commercial hunting and international trade. This book also examines historic and ongoing management strategies and, the importance of new research methodologies in revealing hitherto unknown details of the past, and concludes by discussing the future for Atlantic walruses in the face of climate change and increased human activities in the Arctic. This volume is an ideal resource for those who are seeking to understand an iconic Arctic species and its long and complex relationship with humans. This includes individuals and researchers with a personal or professional connection to walruses or the Arctic, as well as marine biologists, zoologists, conservationists, paleontologists, archaeologists, anthropologists, historians, indigenous communities, natural resource managers and government agencies. Provides succinct overviews of the biology of the Atlantic Walrus (Odobenus rosmarus rosmarus) as well as human cultures within the North Atlantic Arctic and the surrounding region by consolidating research which until now has been scattered across fields and academic publications Editorial team of inter-disciplinary researchers ensuring the breadth, depth and integration of material covered throughout the volume Thirteen chapters, each authored by leading international researchers and experts on the Atlantic Walrus Considers the inter-relatedness and complexity of species biology, ecological change, human culture, and anthropogenic pressures onto the Atlantic Walrus, all while remaining accessible to readers from different disciplines or a more generalist audience Draws upon the latest methods in marine mammal and archaeological research Assesses historical management of the species, while also considering current and future conservation efforts in light of human activities and climate change Text supported by striking and insightful new maps and scientific illustrations, ideal for teaching and outreach
Author: Tracie E. Merrill
Author: U.S. Fish and Wildlife Service
Author: Tracie E. Merrill
Author: 
Author: U.S. Fish and Wildlife Service
Author: James Spencer Taggart
Author: Francis H. Fay
Author: Francis Hollis Fay
Author: Chadwick V. Jay
Author: U.S. Fish and Wildlife Service. Region 7. Marine Mammals Management
Author: Xénia Keighley