An Accounting of the Sources of Steller Sea Lion, Eumetopias jubatus, Mortality
During 1991–2000, the west-are additional mortalities that fueled the ern stock of Steller sea lions, Eumetopias decline. We tabulated the levels of reported jubatus, declined at 5.03% (SE = 0.25%) anthropogenic sources of mortality (sub-per year, statistically significant rates (P < sistence, in...
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ftoceandocs:oai:aquadocs.org:1834/26378 2023-05-15T18:49:00+02:00 An Accounting of the Sources of Steller Sea Lion, Eumetopias jubatus, Mortality Loughlin, Thomas R. York, Anne E. 2000 application/pdf 40-45 http://hdl.handle.net/1834/26378 en eng http://spo.nwr.noaa.gov/mfr624/mfr6242.pdf 0090-1830 http://hdl.handle.net/1834/26378 http://aquaticcommons.org/id/eprint/9764 403 2012-08-16 14:33:10 9764 United States National Marine Fisheries Service Biology Ecology Environment Management article TRUE 2000 ftoceandocs 2023-04-06T17:03:10Z During 1991–2000, the west-are additional mortalities that fueled the ern stock of Steller sea lions, Eumetopias decline. We tabulated the levels of reported jubatus, declined at 5.03% (SE = 0.25%) anthropogenic sources of mortality (sub-per year, statistically significant rates (P < sistence, incidental take in fisheries, and 0.10) in all but the eastern Aleutian Islands research), estimated another (illegal shoot-region. The greatest rates of declines oc-ing), then approximated levels of predation curred in the eastern and central Gulf of Alas-(killer whales and sharks). We attempted to ka and the western Aleutian Islands (> 8.2% partition the various sources of “additional” per year). Using a published correction mortalities as anthropogenic and as addifactor, we estimated the total non-pup pop-tional mortality including some predation. ulation size in Alaska of the western stock We classified 436 anthropogenic mortalities of Steller sea lions to be about 33,000 ani-and 769 anthropogenic plus some predation mals. Based on a published life table and mortalities as “mortality above replace-the current rate of decline, we estimate that ment”; this accounted for 26% and 46% of the total number of mortalities of non-pup the estimated total level of “mortality above Steller sea lions during 1991–2000 was replacement”, respectively. The remaining about 6,383 animals; of those, 4,718 (74%) mortality (74% and 54%, respectively) was are mortalities that would have occurred if not attributed to a specific cause and may be the population were stable, and 1,666 (26%) the result of nutritional stress. Article in Journal/Newspaper Alaska Aleutian Islands IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications |
institution |
Open Polar |
collection |
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications |
op_collection_id |
ftoceandocs |
language |
English |
topic |
Biology Ecology Environment Management |
spellingShingle |
Biology Ecology Environment Management Loughlin, Thomas R. York, Anne E. An Accounting of the Sources of Steller Sea Lion, Eumetopias jubatus, Mortality |
topic_facet |
Biology Ecology Environment Management |
description |
During 1991–2000, the west-are additional mortalities that fueled the ern stock of Steller sea lions, Eumetopias decline. We tabulated the levels of reported jubatus, declined at 5.03% (SE = 0.25%) anthropogenic sources of mortality (sub-per year, statistically significant rates (P < sistence, incidental take in fisheries, and 0.10) in all but the eastern Aleutian Islands research), estimated another (illegal shoot-region. The greatest rates of declines oc-ing), then approximated levels of predation curred in the eastern and central Gulf of Alas-(killer whales and sharks). We attempted to ka and the western Aleutian Islands (> 8.2% partition the various sources of “additional” per year). Using a published correction mortalities as anthropogenic and as addifactor, we estimated the total non-pup pop-tional mortality including some predation. ulation size in Alaska of the western stock We classified 436 anthropogenic mortalities of Steller sea lions to be about 33,000 ani-and 769 anthropogenic plus some predation mals. Based on a published life table and mortalities as “mortality above replace-the current rate of decline, we estimate that ment”; this accounted for 26% and 46% of the total number of mortalities of non-pup the estimated total level of “mortality above Steller sea lions during 1991–2000 was replacement”, respectively. The remaining about 6,383 animals; of those, 4,718 (74%) mortality (74% and 54%, respectively) was are mortalities that would have occurred if not attributed to a specific cause and may be the population were stable, and 1,666 (26%) the result of nutritional stress. |
format |
Article in Journal/Newspaper |
author |
Loughlin, Thomas R. York, Anne E. |
author_facet |
Loughlin, Thomas R. York, Anne E. |
author_sort |
Loughlin, Thomas R. |
title |
An Accounting of the Sources of Steller Sea Lion, Eumetopias jubatus, Mortality |
title_short |
An Accounting of the Sources of Steller Sea Lion, Eumetopias jubatus, Mortality |
title_full |
An Accounting of the Sources of Steller Sea Lion, Eumetopias jubatus, Mortality |
title_fullStr |
An Accounting of the Sources of Steller Sea Lion, Eumetopias jubatus, Mortality |
title_full_unstemmed |
An Accounting of the Sources of Steller Sea Lion, Eumetopias jubatus, Mortality |
title_sort |
accounting of the sources of steller sea lion, eumetopias jubatus, mortality |
publishDate |
2000 |
url |
http://hdl.handle.net/1834/26378 |
genre |
Alaska Aleutian Islands |
genre_facet |
Alaska Aleutian Islands |
op_source |
http://aquaticcommons.org/id/eprint/9764 403 2012-08-16 14:33:10 9764 United States National Marine Fisheries Service |
op_relation |
http://spo.nwr.noaa.gov/mfr624/mfr6242.pdf 0090-1830 http://hdl.handle.net/1834/26378 |
_version_ |
1766242419351748608 |