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Diet Comparisons Of Steller Sea Lions Eumetopias Jubatus And California Sea Lions Zalophus Californianus
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Book Synopsis Diet Comparisons of Steller Sea Lions (Eumetopias Jubatus) and California Sea Lions (Zalophus Californianus) by : Sara Young
Download or read book Diet Comparisons of Steller Sea Lions (Eumetopias Jubatus) and California Sea Lions (Zalophus Californianus) written by Sara Young and published by . This book was released on 2011 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: California sea lions (Zalophus californianus) and Steller sea lions (Eumetopias jubatus) bred in overlapping habitat areas in southern California until Steller sea lions began to vacate the area in the 1960s. This study analyzed the diets of Steller sea lions and California sea lions over a period of 50 years, from 1949 to 2003. Prey items from individual sea lion diets were collected from the literature for both species and Shannon-Weaver Index values and Simpson Index values were calculated for each study. The Shannon and Simpson indices quantify the same data in different ways. Although the Shannon Index values were affected by sample size, the Simson index was not. Trophic levels of prey were also considered, with California sea lions eating a significantly wider range of trophic levels than Stellers. While the Shannon Index was significantly affected by sample size and thus inconclusive, the Simpson Index, which was not affected by sample size, found that California sea lions have a more diverse diet than Steller sea lions.
Book Synopsis Comparing the Nutritional Quality of Steller Sea Lion (Eumetopias Jubatus) Diets by : Monica Kaho Herkules Bando
Download or read book Comparing the Nutritional Quality of Steller Sea Lion (Eumetopias Jubatus) Diets written by Monica Kaho Herkules Bando and published by . This book was released on 2002 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Though the primary cause(s) of the Steller sea lion decline remains unknown, one hypothesis is nutritional stress, possibly the result of climatic regime shifts reducing prey availability and/or quality. Researchers at the Alaska SeaLife Center formulated three feeding regimes representative of Steller sea lion diets: prior to and during their population decline and from a stable population. The purpose of this project was to compare the nutritional quality of these diets using proximate composition and bomb calorimetry. The pre-decline and stable diets are composed of more high-fat prey, like herring, with resulting energy densities being significantly higher than the decline diet, comprising more low-fat prey, like octopus. Assumining the feeding regimes analyzed represent Steller sea lion diets prior to and during their population decline and in stable populations, results from this study are consistent with the possibility that nutritional stress is a cause of the Steller sea lion decline"--Leaf iii.
Download or read book NOAA Technical Report NMFS. written by and published by . This book was released on 1984 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Steller Sea Lion and Northern Fur Seal Research by :
Download or read book Steller Sea Lion and Northern Fur Seal Research written by and published by . This book was released on 2007 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seasonal and spatial differences in diet in the western stock of Steller sea lions (Eumetopias jubatus) by : E.H. SINCLAIR
Download or read book Seasonal and spatial differences in diet in the western stock of Steller sea lions (Eumetopias jubatus) written by E.H. SINCLAIR and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The History, Present Condition, and Future of the Molluscan Fisheries of North and Central America and Europe by : Clyde L. MacKenzie
Download or read book The History, Present Condition, and Future of the Molluscan Fisheries of North and Central America and Europe written by Clyde L. MacKenzie and published by . This book was released on 1997 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Michael A. Bigg Publisher :Fisheries and Oceans, Scientific Information and Publications Branch ISBN 13 : Total Pages :32 pages Book Rating :4.:/5 (318 download)
Book Synopsis Status of the Steller Sea Lion (Eumetopias Jubatus) and California Sea Lion (Zalophus Californianus) in British Columbia by : Michael A. Bigg
Download or read book Status of the Steller Sea Lion (Eumetopias Jubatus) and California Sea Lion (Zalophus Californianus) in British Columbia written by Michael A. Bigg and published by Fisheries and Oceans, Scientific Information and Publications Branch. This book was released on 1985 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerial censuses were undertaken for Steller sea lions (Eumetopias jubatus) and California sea lions (Zalophus californianus) during 1971-84, and a review was made of published and unpublished data on numbers seen and numbers killed since 1913. These data were used to describe the location of haulout sites, season of occupation at haulout sites, regional movement patterns, and trends in numbers seen for each species during this century.
Book Synopsis Steller Sea Lions (Eumetopias Jubatus) by : Andrew W. Trites
Download or read book Steller Sea Lions (Eumetopias Jubatus) written by Andrew W. Trites and published by . This book was released on 1998 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the changes in the Steller sea lion's diet over time (from a diverse diet including fatty fishes to one dominated by pollock), which has resulted in negative reproductive and survival consequences
Book Synopsis Recovery Plan for the Steller Sea Lion (Eumetopias Jubatus) by :
Download or read book Recovery Plan for the Steller Sea Lion (Eumetopias Jubatus) written by and published by . This book was released on 1992 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Regulatory Impact/initial Flexibility Analysis of Proposed Inshore/offshore Allocation Alternatives, Amendment 18/23 to Groundfish, Bering Sea and Aleutian Islands Fisheries Management Plan (FMP) and Gulf of Alaska Groundfish Fisheries Management Plan (FMP) by :
Download or read book Regulatory Impact/initial Flexibility Analysis of Proposed Inshore/offshore Allocation Alternatives, Amendment 18/23 to Groundfish, Bering Sea and Aleutian Islands Fisheries Management Plan (FMP) and Gulf of Alaska Groundfish Fisheries Management Plan (FMP) written by and published by . This book was released on 1992 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Endangered Species Act, Section 7 Consultation by :
Download or read book Endangered Species Act, Section 7 Consultation written by and published by . This book was released on 1998 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Marine Fisheries Review written by and published by . This book was released on with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Decadal Variation in the Diet of Western Stock Steller Sea Lions (Eumetopias Jubatus) by : Elizabeth Hacker Sinclair
Download or read book Decadal Variation in the Diet of Western Stock Steller Sea Lions (Eumetopias Jubatus) written by Elizabeth Hacker Sinclair and published by . This book was released on 2013 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: Steller sea lions (Eumetopias jubatus) are listed as an endangered species in western Alaska due to a precipitous decline that occurred in the 1980s and 1990s. In 2000, cascading declines slowed or ceased and clusters of rookeries between the eastern Aleutian Islands and eastern Gulf of Alaska began to show signs of population growth. Reasons for the decline and for a range-wide failure to recover are unresolved, but reduction in the availability of prey due to commercial fishing or environmental perturbation has been hypothesized. Discerning the diet and patterns of prey use by Steller sea lions (SSL) is fundamental to isolating the mechanisms driving population health. Here we evaluate the frequency of occurrence (FO) of prey species in 3,412 scats of adult female and juvenile SSL collected during 1999-2009, across the range of the U. S. Western Stock. Thirteen primary prey are identified based on their occurrence in ≥ 5% of total scats. We reduce the dimension of the diet profile of the 13 primary prey to two categorical groups through principal component analysis (PC). A hierarchical cluster analysis of PC scores on collection site locations describes four geographic regions of SSL diet (with Amak Island as an outlier) nearly identical to those identified in a previously published 1990-1998 (n = 3,762) dataset. Geographic regions of diet continue to correspond with regional population trends of SSL. The species of primary prey consumed by SSL are analogous between 1990-1998 and 1999-2009. However, the rangewide FO of 7 of the 13 primary prey increased significantly (p ≤ 0.05) during the latter decade. Only cephalopods (Gonatidae) and walleye pollock (Theragra chalcogramma) decreased significantly in FO in any season or region between decades. Generalized linear mixed models (GLMM) of seasonal prey FO determined that trends in the FO of primary prey between decades were locally driven by significant changes within one or more of the four diet regions and fishery conservation management areas (RCA). The most significant increases (p = 0.001) in FO during 1999-2009 were for commercial fishes: arrowtooth flounder (Atheresthes sp.), Atka mackerel (Pleurogrammus monopterygius), rock sole (Lepidopsetta sp.), and Pacific cod (Gadus macrocephalus); and one non-commercial fish species (Pacific sand lance, Ammodytes hexapterus) in diet Regions 2 and 3 (RCA zones 6 and 7) between the eastern Aleutian Islands and western Gulf of Alaska. Diversity scores (H') for primary prey were also highest in these regions compared to the previous decade, and are coincident with SSL population increases that began in the same area in 2000. Atka mackerel continues to dominate SSL diet west of Samalga Pass, and walleye pollock continues to dominate SSL diet east of Samalga Pass (despite its decreased presence in diets in Regions 1-3 during 1999-2009). The results of generalized additive mixed models (GAMM) of annual trends (1990-2009) in summer prey FO on each rookery across the study area are consistent with the results of GLMM decadal comparisons. The additional 11 years of data presented here support earlier conclusions that adult female and young juvenile SSL of the Western Stock collectively eat a wide variety of prey species, but demonstrate fidelity to prey types that are predictably available in seasonal concentrations over the continental shelf or other bathymetric structures, within close range of natal rookery sites. Foraging within close proximity to birth and breeding sites keeps adult females close to pups onshore and to young juveniles learning to forage. However, it also increases their vulnerability to potential nearshore environmental and anthropogenic interference which could ultimately influence their reproductive success. It was not the objective of this study to define the relationship between SSL diet and population decline, or to identify the interactive mechanisms that drive diet change. However, coincident patterns emerged that suggest relationships between SSL diet, regional population patterns, climate and fisheries. Some of the patterns are worthy of discussion and future research: 1) the areas of greatest increases in the FO and diversity of prey (Regions 2 and 3) beginning in 1999, overlap with those of the strongest population growth since 1999; 2) the increase in primary prey FO and diversity since 1999 is coincident with increased restrictions on groundfish trawling within SSL Critical Habitat, enacted in 2000; and 3) the area of lowest prey diversity (Region 4) overlaps with those areas of continuing population declines, the most restricted foraging habitat (narrow continental shelf) and the lowest seasonal and temporal variability in sea surface temperature in all years of study.
Book Synopsis National Oceanic and Atmospheric Administration Technical Report National Marine Fisheries Service by :
Download or read book National Oceanic and Atmospheric Administration Technical Report National Marine Fisheries Service written by and published by . This book was released on 1996 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wildlife Review written by and published by . This book was released on 1986 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Natural History of Canadian Mammals by : Donna Naughton
Download or read book The Natural History of Canadian Mammals written by Donna Naughton and published by University of Toronto Press. This book was released on 2012-01-01 with total page 985 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The selection of species to include in this book was based on two principles: 1. Those that in recent times had a viable, naturally occurring wild population in Canada, its continental islands, or in the marine waters of its continental shelf ... [and] 2. Species introduced into Canada by humans"--P. xiv.
Book Synopsis Ethology and Behavioral Ecology of Otariids and the Odobenid by : Claudio Campagna
Download or read book Ethology and Behavioral Ecology of Otariids and the Odobenid written by Claudio Campagna and published by Springer Nature. This book was released on 2021-06-02 with total page 667 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is focused on the marine mammalian groups the Otariidae and the Odobenidae, otherwise known as fur seals, sea lions and the walrus. In 30 chapters, more than 60 authors from 30 institutions and 13 nationalities, discuss a broad suite of topics from maternal care and mating behavior, through play, cognition and personality, to adaptation to life in the Anthropocene. The authors explore the behaviors that have allowed these semi-aquatic mammals to thrive in the marine realm. Many populations have recovered following historical decimation, with interesting evolutionary consequences which are explored. Detailed, selected, individual species descriptions are also provided, showcasing the behavioral diversity of this engaging, adaptive and highly successful group of marine mammals.