Author: Bruce Reed MatePublisher:
ISBN:
Category : California sea lion
Languages : en
Pages : 226
Book Description
Population Kinetics and Related Ecology of the Northern Sea Lion, Eumetopias Jubatus, and the California Sea Lion, Zalophus Californianus, Along the Oregon Coast
Author: Bruce Reed MatePublisher:
ISBN:
Category : California sea lion
Languages : en
Pages : 226
Book Description
Population Kinetics and Related Ecology of the Northern Sea Lion
Author: Bruce R. MatePublisher:
ISBN:
Category : California sea lion
Languages : en
Pages : 94
Book Description
Decline of the Steller Sea Lion in Alaskan Waters
Author: National Research CouncilPublisher: National Academies Press
ISBN: 0309086329
Category : Science
Languages : en
Pages : 217
Book Description
For an unknown reason, the Steller sea lion population in Alaska has declined by 80% over the past three decades. In 2001, the National Research Council began a study to assess the many hypotheses proposed to explain the sea lion decline including insufficient food due to fishing or the late 1970s climate/regime shift, a disease epidemic, pollution, illegal shooting, subsistence harvest, and predation by killer whales or sharks. The report's analysis indicates that the population decline cannot be explained only by a decreased availability of food; hence other factors, such as predation and illegal shooting, deserve further study. The report recommends a management strategy that could help determine the impact of fisheries on sea lion survival-establishing open and closed fishing areas around sea lion rookeries. This strategy would allow researchers to study sea lions in relatively controlled, contrasting environments. Experimental area closures will help fill some short-term data gaps, but long-term monitoring will be required to understand why sea lions are at a fraction of their former abundance.
NOAA Technical Report NMFS.
Author: An Ecological Characterization of the Pacific Northwest Coastal Region
Author: An Annotated Catalog of Published and Unpublished Sources of Data on Populations, Life History, and Ecology of Coastal Marine Mammals of California
Author: Steller Sea Lion and Northern Fur Seal Research
Author: An Ecological Characterization of the Pacific Northwest Coastal Region: Data source appendix
Author: Pinnipeds and El Niño
Author: Fritz TrillmichPublisher: Springer Science & Business Media
ISBN: 3642763987
Category : Science
Languages : en
Pages : 299
Book Description
El Niño is a meteorological and oceanographic phenomenon, which occurs at irregular intervals in the eastern tropical Pacific. Its most obvious characteristic is the warming of surface waters, which causes enormous disturbances of the marine environment. A severe Niño may also affect continental systems worldwide. This book gathers in a comprehensive way the information available on the effects of the exceptionally strong 1982-83 Niño on a group of marine mammals, the pinnipeds. It presents an analysis of the effects of environmental stress on the populations of top predators. Data and interpretations are based on a most unusual collection of long-term studies of pinniped population dynamics, behavior and ecology which spanned the El Niño event. The responses of pinniped populations to the El Niño disturbance of the marine ecosystem also has important implications for the management and conservation of marine mammal populations.
Population Assessment, Ecology and Trophic Relationships of Steller Sea Lions in the Gulf of Alaska
Author: Donald Gary CalkinsPublisher:
ISBN:
Category : Sea lions
Languages : en
Pages : 150
Book Description