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Research Program On The Sea Otter Enhydra Lutris And Its Environment

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Research Program On The Sea Otter Enhydra Lutris And Its Environment

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Author :
language : en
Publisher:
Release Date : 1980

Research Program On The Sea Otter Enhydra Lutris And Its Environment written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Sea otter categories.

The Sea Otter Enhydra Lutris

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Author : Marianne Riedman
language : en
Publisher:
Release Date : 1991

The Sea Otter Enhydra Lutris written by Marianne Riedman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Enhydra categories.

Sea Otter Conservation

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Author : Shawn Larson
language : en
Publisher: Academic Press
Release Date : 2024-06-25

Sea Otter Conservation written by Shawn Larson and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-06-25 with Science categories.

Sea Otter Conservation: Nearshore Ecosystem Restoration, Second Edition offers the most updated and revised ecological knowledge for conserving sea otters and their coastal habitats. As sea otters are good indicators of ocean health, they are also keystone species, offering a stabilizing effect on ecosystems, controlling sea urchin populations that can damage kelp forests, and curbing coastal erosion. This book synthesizes the important relationship between sea otters and conservation of themselves as well as vital marine ecosystems. Written by experts in the field, this book contains two sections that focus first on the latest data, practices, and hands-on research for conserving coastal ecosystems. Sections offer links between sea otter presence and increased kelp, seagrass, and geological conservation, while also focusing specifically on the sea otter and providing up-to-date research, data, and case studies regarding their genetics, habitats, and impacts of climate change.

The Sea Otter Enhydra Lutris

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Author : Marianne Riedman
language : en
Publisher:
Release Date : 1990

A current review of the biology, ecology, and behavior of the sea otter (Enhydra lutris). Emphasis is placed on the populations and habitat in central California but results of studies in Alaska, Canada, and the Soviet Union are also covered. Management and conservation problems such as conflicts with shellfisheries and concerns about oil pollution are also touched on.

Hydrocarbons In Sea Otters Enhydra Lutris And Their Habitat In Coastal British Columbia Canada

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Author : Katherine Anne Harris
language : en
Publisher:
Release Date : 2010

Hydrocarbons In Sea Otters Enhydra Lutris And Their Habitat In Coastal British Columbia Canada written by Katherine Anne Harris and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.

The purpose of this work was to examine the source and fate of hydrocarbons, the primary constituents of oil, in sea otter (Enhydra lutris) habitat on the west coast of British Columbia (BC), Canada and their fate in the sea otter food web. Oil pollution is the primary threat to this recovering population, reflecting their extreme vulnerability as a result of several unique life history characteristics, including the absence of a blubber layer, reliance on their fur for insulation, and the fact that their entire lives can be spent at sea. While the vulnerability of sea otters to acute oil exposure has been demonstrated, chronic hydrocarbon exposure through dietary processes is not well understood. We measured hydrocarbon (alkane, hopane and sterane biomarker, and polycyclic aromatic) concentrations in sediments, prey items, and live-captured sea otters using high resolution gas chromatography/high resolution mass spectrometry (HRGC/HRMS). Background signatures were characterized for remote sediment sites, with polycyclic aromatic hydrocarbon (PAH) patterns revealing the predominance of petrogenic sources. However, PAH concentrations were up to three orders of magnitude higher at two small harbour sites, with patterns reflecting weathered petroleum and the combustion of fossil fuels and biomass. Concentrations at these sites exceeded both national and provincial sediment quality guidelines for the protection of aquatic life. Despite differences in habitat and feeding ecology, all sea otter prey species sampled exhibited PAH patterns dominated by petrogenic low molecular weight (LMW) compounds, highlighting the likely importance of water as an exposure route. While biota-sediment accumulation factors (BSAFs) generally decreased with increasing octanol-water partitioning coefficients (log Kow) for parent PAHs, BSAFs for alkyl PAHs increased, indicative of bioaccumulation by invertebrates. Biomagnification factors (BMFs) indicated that while parent PAHs biodiluted in sea otters, consistent with metabolic elimination, some higher alkylated 3- and 4-ring PAHs biomagnified, challenging the commonly held view that PAHs dilute in food webs. This retention was reflected in estimated?PAH body burdens, in which alkyl PAHs comprised 89? 7% and 84? 10% of totals in male and female otters, respectively. While vertebrates are efficient metabolizers of parent PAHs, this apparent retention of some alkyl PAHs in sea otters raises concerns about the potential toxicological effects of these poorly understood compounds. This research suggests that sea otters may be vulnerable to PAH-related health risks as a consequence of their large dietary requirements (~25% of body weight per day), even when prey PAH concentrations are low.

Quantifying The Drivers And Mechanisms Of Sea Otter Enhydra Lutris Foraging Behaviour On The Central Coast Of British Columbia Canada

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Author : Leah Darshan Honka
language : en
Publisher:
Release Date : 2014

Quantifying The Drivers And Mechanisms Of Sea Otter Enhydra Lutris Foraging Behaviour On The Central Coast Of British Columbia Canada written by Leah Darshan Honka and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.

As preferred prey become scarce, theory suggests that predator per-capita consumption rates decline and predator diets diversify. As a keystone predator, sea otters (Enhydra lutris) are known to have remarkable impacts on their macroinvertebrate prey, however, variation in the magnitude of these effects through time remain less well known. Using a space-for-time substitution, we quantified sea otter foraging behaviour at 5 rocky reef sites that fell along a gradient in otter occupation time (0.1-33 years) on British Columbia, Canada's central coast. As site occupation time increased, sea otters targeted increasingly smaller, more diverse macroinvertebrate prey suggesting the serial depletion of preferred to less valuable prey. We found strong evidence that urchin density and occupation time were important drivers of sea otter per-capita consumption rates on urchins, strongly interacting rocky reef herbivores, well known to drive the distribution and abundance of kelps. In addition, there was greater strength of evidence for prey-dependent over predator-dependent functional response models of sea otter consumption of urchins. These results have implications for nearshore productivity, commercial and subsistence shellfish fisheries and balancing the trade-offs inherent to ecosystem-based management.

Final Revised Recovery Plan For The Southern Sea Otter Enhydra Lutris Nereis

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Author : Douglas P. DeMaster
language : en
Publisher:
Release Date : 2002

Final Revised Recovery Plan For The Southern Sea Otter Enhydra Lutris Nereis written by Douglas P. DeMaster and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.