Movements and foraging areas of naïve, recently weaned southern elephant seal pups
Summary Female southern elephant seals ( Mirounga leonina L . ) expend variable, often large, amounts of their stored body resources on their pups during lactation. There is some evidence that pups with higher weaning masses have a better chance of surviving their first year. But in order to underst...
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crwiley:10.1046/j.0021-8790.2001.00576.x 2024-06-23T07:46:34+00:00 Movements and foraging areas of naïve, recently weaned southern elephant seal pups McConnell, Bernie Fedak, Mike. Burton, Harry R. Engelhard, G. H. Reijnders, Peter J. H. 2002 http://dx.doi.org/10.1046/j.0021-8790.2001.00576.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.0021-8790.2001.00576.x https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1046/j.0021-8790.2001.00576.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Animal Ecology volume 71, issue 1, page 65-78 ISSN 0021-8790 1365-2656 journal-article 2002 crwiley https://doi.org/10.1046/j.0021-8790.2001.00576.x 2024-06-13T04:24:29Z Summary Female southern elephant seals ( Mirounga leonina L . ) expend variable, often large, amounts of their stored body resources on their pups during lactation. There is some evidence that pups with higher weaning masses have a better chance of surviving their first year. But in order to understand what level of maternal investment is required to produce successful pups, we need to understand the behaviour and problems faced by naïve pups before nutritional independence. We used satellite telemetry to track 30 newly weaned pups on their first trip to sea from their natal site at Macquarie Island in 1995 and 1996. Track duration varied from 2 to 179 (mean, 77) days. Seven seals were tracked for the entire duration of their first trip. The movements were grouped into three phases. Phase 1 (mean duration 30 days) was characterized by rapid and directed dispersal from Macquarie Island at daily travel rates of up to 140 km day −1 . Phase 2 (mean duration 67 days) consisted of slower travel rates (generally < 20 km day −1 ) where activity was often centred on localized patches up to 1900 km from Macquarie Island. This phase was sometimes interrupted by bouts of increased travel rate as the seal moved to another patch. Phase 3 (mean duration 42 days) consisted of prolonged increased travel rates as the seals returned to Macquarie or, in one case, Chatham Island. The routes of the tracks to the south‐east were very similar. Simulated tracks based on a constant heading of magnetic east, at variable swimming speed, and modified by ocean current vectors produced a pattern similar to, but not identical to, the south‐east tracks. The tracks to the west and south were more diverse and meandering. Based on a nearest neighbour analysis, neither sex, year nor weaning mass influenced Phase 1–2 or Phase 2–3 transition locations. Phase 2 tracks were associated in the south‐eastern group with the Pacific Antarctic Ridge and in the south‐west group, to a lesser extent, with the Indian Antarctic Ridge. The southern limits of ... Article in Journal/Newspaper Antarc* Antarctic Elephant Seal Elephant Seals Macquarie Island Mirounga leonina Southern Elephant Seal Southern Elephant Seals Wiley Online Library Antarctic Indian Pacific Journal of Animal Ecology 71 1 65 78 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Summary Female southern elephant seals ( Mirounga leonina L . ) expend variable, often large, amounts of their stored body resources on their pups during lactation. There is some evidence that pups with higher weaning masses have a better chance of surviving their first year. But in order to understand what level of maternal investment is required to produce successful pups, we need to understand the behaviour and problems faced by naïve pups before nutritional independence. We used satellite telemetry to track 30 newly weaned pups on their first trip to sea from their natal site at Macquarie Island in 1995 and 1996. Track duration varied from 2 to 179 (mean, 77) days. Seven seals were tracked for the entire duration of their first trip. The movements were grouped into three phases. Phase 1 (mean duration 30 days) was characterized by rapid and directed dispersal from Macquarie Island at daily travel rates of up to 140 km day −1 . Phase 2 (mean duration 67 days) consisted of slower travel rates (generally < 20 km day −1 ) where activity was often centred on localized patches up to 1900 km from Macquarie Island. This phase was sometimes interrupted by bouts of increased travel rate as the seal moved to another patch. Phase 3 (mean duration 42 days) consisted of prolonged increased travel rates as the seals returned to Macquarie or, in one case, Chatham Island. The routes of the tracks to the south‐east were very similar. Simulated tracks based on a constant heading of magnetic east, at variable swimming speed, and modified by ocean current vectors produced a pattern similar to, but not identical to, the south‐east tracks. The tracks to the west and south were more diverse and meandering. Based on a nearest neighbour analysis, neither sex, year nor weaning mass influenced Phase 1–2 or Phase 2–3 transition locations. Phase 2 tracks were associated in the south‐eastern group with the Pacific Antarctic Ridge and in the south‐west group, to a lesser extent, with the Indian Antarctic Ridge. The southern limits of ... |
format |
Article in Journal/Newspaper |
author |
McConnell, Bernie Fedak, Mike. Burton, Harry R. Engelhard, G. H. Reijnders, Peter J. H. |
spellingShingle |
McConnell, Bernie Fedak, Mike. Burton, Harry R. Engelhard, G. H. Reijnders, Peter J. H. Movements and foraging areas of naïve, recently weaned southern elephant seal pups |
author_facet |
McConnell, Bernie Fedak, Mike. Burton, Harry R. Engelhard, G. H. Reijnders, Peter J. H. |
author_sort |
McConnell, Bernie |
title |
Movements and foraging areas of naïve, recently weaned southern elephant seal pups |
title_short |
Movements and foraging areas of naïve, recently weaned southern elephant seal pups |
title_full |
Movements and foraging areas of naïve, recently weaned southern elephant seal pups |
title_fullStr |
Movements and foraging areas of naïve, recently weaned southern elephant seal pups |
title_full_unstemmed |
Movements and foraging areas of naïve, recently weaned southern elephant seal pups |
title_sort |
movements and foraging areas of naïve, recently weaned southern elephant seal pups |
publisher |
Wiley |
publishDate |
2002 |
url |
http://dx.doi.org/10.1046/j.0021-8790.2001.00576.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.0021-8790.2001.00576.x https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1046/j.0021-8790.2001.00576.x |
geographic |
Antarctic Indian Pacific |
geographic_facet |
Antarctic Indian Pacific |
genre |
Antarc* Antarctic Elephant Seal Elephant Seals Macquarie Island Mirounga leonina Southern Elephant Seal Southern Elephant Seals |
genre_facet |
Antarc* Antarctic Elephant Seal Elephant Seals Macquarie Island Mirounga leonina Southern Elephant Seal Southern Elephant Seals |
op_source |
Journal of Animal Ecology volume 71, issue 1, page 65-78 ISSN 0021-8790 1365-2656 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.0021-8790.2001.00576.x |
container_title |
Journal of Animal Ecology |
container_volume |
71 |
container_issue |
1 |
container_start_page |
65 |
op_container_end_page |
78 |
_version_ |
1802646750609014784 |