DEVELOPMENT OF DIVING BY HARBOR SEAL PUPS IN TWO REGIONS OF ALASKA: USE OF THE WATER COLUMN
Abstract Satellite‐linked dive recorders were attached to 53 harbor seal pups in Prince William Sound (PWS) and at Tugidak Island, Alaska, during 1997–1999. We used generalized additive models and bootstrap techniques to describe pup diving behavior during their first year of life. Pups increased th...
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crwiley:10.1111/j.1748-7692.2006.00056.x 2024-05-19T07:41:36+00:00 DEVELOPMENT OF DIVING BY HARBOR SEAL PUPS IN TWO REGIONS OF ALASKA: USE OF THE WATER COLUMN Frost, Kathryn J. Simpkins, Michael A. Small, Robert J. Lowry, Lloyd F. 2006 http://dx.doi.org/10.1111/j.1748-7692.2006.00056.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2006.00056.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2006.00056.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 22, issue 3, page 617-643 ISSN 0824-0469 1748-7692 journal-article 2006 crwiley https://doi.org/10.1111/j.1748-7692.2006.00056.x 2024-04-25T08:30:35Z Abstract Satellite‐linked dive recorders were attached to 53 harbor seal pups in Prince William Sound (PWS) and at Tugidak Island, Alaska, during 1997–1999. We used generalized additive models and bootstrap techniques to describe pup diving behavior during their first year of life. Pups increased their ability to dive during the first 3–6 mo, as indicated by increases in proportion of time in the water (time wet) and maximum dive depth achieved by a pup each day (max‐depth) values. Time wet and/or max‐depth later decreased, suggesting a seasonal component to diving behavior. Monthly time wet varied from an overall minimum of 0.68 at tagging in July to a maximum of 0.89 in November. Pups spent half of their time wet swimming in water <25 m deep, the shallowest 30% of the available water column. They spent only 5% of their time swimming in the deepest 30% of the available water column, at depths >60–70 m. This strongly suggests they were not feeding on or near bottom during their first year. Average max‐depths and deepest actual dives were similar for PWS and Tugidak pups. PWS pups dove deeper sooner and spent less time wet than Tugidak pups during the first few months after tagging, probably as a result of regional bathymetric differences. Diving behavior and body condition suggest that food availability was not likely a major factor in the population decline in PWS during the period of this study. Article in Journal/Newspaper harbor seal Alaska Wiley Online Library Marine Mammal Science 22 3 617 643 |
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description |
Abstract Satellite‐linked dive recorders were attached to 53 harbor seal pups in Prince William Sound (PWS) and at Tugidak Island, Alaska, during 1997–1999. We used generalized additive models and bootstrap techniques to describe pup diving behavior during their first year of life. Pups increased their ability to dive during the first 3–6 mo, as indicated by increases in proportion of time in the water (time wet) and maximum dive depth achieved by a pup each day (max‐depth) values. Time wet and/or max‐depth later decreased, suggesting a seasonal component to diving behavior. Monthly time wet varied from an overall minimum of 0.68 at tagging in July to a maximum of 0.89 in November. Pups spent half of their time wet swimming in water <25 m deep, the shallowest 30% of the available water column. They spent only 5% of their time swimming in the deepest 30% of the available water column, at depths >60–70 m. This strongly suggests they were not feeding on or near bottom during their first year. Average max‐depths and deepest actual dives were similar for PWS and Tugidak pups. PWS pups dove deeper sooner and spent less time wet than Tugidak pups during the first few months after tagging, probably as a result of regional bathymetric differences. Diving behavior and body condition suggest that food availability was not likely a major factor in the population decline in PWS during the period of this study. |
format |
Article in Journal/Newspaper |
author |
Frost, Kathryn J. Simpkins, Michael A. Small, Robert J. Lowry, Lloyd F. |
spellingShingle |
Frost, Kathryn J. Simpkins, Michael A. Small, Robert J. Lowry, Lloyd F. DEVELOPMENT OF DIVING BY HARBOR SEAL PUPS IN TWO REGIONS OF ALASKA: USE OF THE WATER COLUMN |
author_facet |
Frost, Kathryn J. Simpkins, Michael A. Small, Robert J. Lowry, Lloyd F. |
author_sort |
Frost, Kathryn J. |
title |
DEVELOPMENT OF DIVING BY HARBOR SEAL PUPS IN TWO REGIONS OF ALASKA: USE OF THE WATER COLUMN |
title_short |
DEVELOPMENT OF DIVING BY HARBOR SEAL PUPS IN TWO REGIONS OF ALASKA: USE OF THE WATER COLUMN |
title_full |
DEVELOPMENT OF DIVING BY HARBOR SEAL PUPS IN TWO REGIONS OF ALASKA: USE OF THE WATER COLUMN |
title_fullStr |
DEVELOPMENT OF DIVING BY HARBOR SEAL PUPS IN TWO REGIONS OF ALASKA: USE OF THE WATER COLUMN |
title_full_unstemmed |
DEVELOPMENT OF DIVING BY HARBOR SEAL PUPS IN TWO REGIONS OF ALASKA: USE OF THE WATER COLUMN |
title_sort |
development of diving by harbor seal pups in two regions of alaska: use of the water column |
publisher |
Wiley |
publishDate |
2006 |
url |
http://dx.doi.org/10.1111/j.1748-7692.2006.00056.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2006.00056.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2006.00056.x |
genre |
harbor seal Alaska |
genre_facet |
harbor seal Alaska |
op_source |
Marine Mammal Science volume 22, issue 3, page 617-643 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1748-7692.2006.00056.x |
container_title |
Marine Mammal Science |
container_volume |
22 |
container_issue |
3 |
container_start_page |
617 |
op_container_end_page |
643 |
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1799481206247522304 |