Past and present status of the southern elephant seal ( Mirounga leonina) at Macquarie Island
The southern elephant seal population at Macquarie Island has undergone a serious decline since regular surveys were commenced in 1949. Approximately 2,900 cows and 250 bulls were counted in the isthmus study area during the 1985 breeding season. Comparisons with 20 other counts made in the same are...
Published in: | Journal of Zoology |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
1987
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/j.1469-7998.1987.tb03712.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1987.tb03712.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1987.tb03712.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1987.tb03712.x |
id |
crwiley:10.1111/j.1469-7998.1987.tb03712.x |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/j.1469-7998.1987.tb03712.x 2024-09-15T18:04:33+00:00 Past and present status of the southern elephant seal ( Mirounga leonina) at Macquarie Island Hindell, M. A. Burton, H. R. 1987 http://dx.doi.org/10.1111/j.1469-7998.1987.tb03712.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1987.tb03712.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1987.tb03712.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1987.tb03712.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Zoology volume 213, issue 2, page 365-380 ISSN 0952-8369 1469-7998 journal-article 1987 crwiley https://doi.org/10.1111/j.1469-7998.1987.tb03712.x 2024-07-04T04:29:17Z The southern elephant seal population at Macquarie Island has undergone a serious decline since regular surveys were commenced in 1949. Approximately 2,900 cows and 250 bulls were counted in the isthmus study area during the 1985 breeding season. Comparisons with 20 other counts made in the same area between 1949 and 1984 showed that, although there was considerable fluctuation between the years, the number of seals ashore has dropped at an average rate of 2.1% per year, resulting in a net decrease of approximately 50% for both males and females. This is similar to the ratio of decline of elephant seal populations in the southern Indian Ocean. The census information from all major elephant seal populations was reviewed and it was concluded that there may be a common factor, or group of factors, acting to reduce the Macquarie Island and Indian Ocean populations, while the populations of the South Atlantic seem to be stable. Several potential explanations for these observations are advanced, but it is concluded that a greater knowledge of the ecology of the seals is needed if the declines are to be understood. Article in Journal/Newspaper Elephant Seal Macquarie Island Mirounga leonina Southern Elephant Seal Wiley Online Library Journal of Zoology 213 2 365 380 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
The southern elephant seal population at Macquarie Island has undergone a serious decline since regular surveys were commenced in 1949. Approximately 2,900 cows and 250 bulls were counted in the isthmus study area during the 1985 breeding season. Comparisons with 20 other counts made in the same area between 1949 and 1984 showed that, although there was considerable fluctuation between the years, the number of seals ashore has dropped at an average rate of 2.1% per year, resulting in a net decrease of approximately 50% for both males and females. This is similar to the ratio of decline of elephant seal populations in the southern Indian Ocean. The census information from all major elephant seal populations was reviewed and it was concluded that there may be a common factor, or group of factors, acting to reduce the Macquarie Island and Indian Ocean populations, while the populations of the South Atlantic seem to be stable. Several potential explanations for these observations are advanced, but it is concluded that a greater knowledge of the ecology of the seals is needed if the declines are to be understood. |
format |
Article in Journal/Newspaper |
author |
Hindell, M. A. Burton, H. R. |
spellingShingle |
Hindell, M. A. Burton, H. R. Past and present status of the southern elephant seal ( Mirounga leonina) at Macquarie Island |
author_facet |
Hindell, M. A. Burton, H. R. |
author_sort |
Hindell, M. A. |
title |
Past and present status of the southern elephant seal ( Mirounga leonina) at Macquarie Island |
title_short |
Past and present status of the southern elephant seal ( Mirounga leonina) at Macquarie Island |
title_full |
Past and present status of the southern elephant seal ( Mirounga leonina) at Macquarie Island |
title_fullStr |
Past and present status of the southern elephant seal ( Mirounga leonina) at Macquarie Island |
title_full_unstemmed |
Past and present status of the southern elephant seal ( Mirounga leonina) at Macquarie Island |
title_sort |
past and present status of the southern elephant seal ( mirounga leonina) at macquarie island |
publisher |
Wiley |
publishDate |
1987 |
url |
http://dx.doi.org/10.1111/j.1469-7998.1987.tb03712.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1987.tb03712.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1987.tb03712.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1987.tb03712.x |
genre |
Elephant Seal Macquarie Island Mirounga leonina Southern Elephant Seal |
genre_facet |
Elephant Seal Macquarie Island Mirounga leonina Southern Elephant Seal |
op_source |
Journal of Zoology volume 213, issue 2, page 365-380 ISSN 0952-8369 1469-7998 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1469-7998.1987.tb03712.x |
container_title |
Journal of Zoology |
container_volume |
213 |
container_issue |
2 |
container_start_page |
365 |
op_container_end_page |
380 |
_version_ |
1810442072850694144 |