Recent population change of the southern elephant seal at Îles Crozet and Îles Kerguelen: the end of the decrease?
The elephant seal populations breeding on the Îles Crozet and Kerguelen were regularly surveyed over the last three decades. At Îles Kerguelen the number of breeding females decreased at an annual rate of 3.6% between 1970 and 1987, then increased at an annual rate of 1.1% to 1997. At Îles Crozet, t...
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Online Access: | http://dx.doi.org/10.1017/s0954102099000255 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102099000255 |
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crcambridgeupr:10.1017/s0954102099000255 2024-03-03T08:39:29+00:00 Recent population change of the southern elephant seal at Îles Crozet and Îles Kerguelen: the end of the decrease? Guinet, Christophe Jouventin, Pierre Weimerskirch, Henri 1999 http://dx.doi.org/10.1017/s0954102099000255 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102099000255 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 11, issue 2, page 193-197 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 1999 crcambridgeupr https://doi.org/10.1017/s0954102099000255 2024-02-08T08:48:51Z The elephant seal populations breeding on the Îles Crozet and Kerguelen were regularly surveyed over the last three decades. At Îles Kerguelen the number of breeding females decreased at an annual rate of 3.6% between 1970 and 1987, then increased at an annual rate of 1.1% to 1997. At Îles Crozet, the population was reported to decrease at a rate of 5.35% between 1970 and 1990 but no change in numbers was found between 1990 and 1997. These results indicate that the rapid decline observed both at Îles Crozet and Îles Kerguelen has ended, and these populations are now either stable or slightly increasing. We suggest that broad scale change in environmental factors affecting the food availability for elephant seals may be responsible for the change in numbers of these marine predators. The higher rate of decrease, the longer period of decline, and the absence of any significant change between 1990 and 1997 observed on the Îles Crozet may be explained by additional factors such as killer whale predation. Article in Journal/Newspaper Antarctic Science Elephant Seal Elephant Seals Îles Crozet Killer Whale Southern Elephant Seal Killer whale Cambridge University Press Îles Kerguelen ENVELOPE(69.167,69.167,-49.250,-49.250) Kerguelen Antarctic Science 11 2 193 197 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Guinet, Christophe Jouventin, Pierre Weimerskirch, Henri Recent population change of the southern elephant seal at Îles Crozet and Îles Kerguelen: the end of the decrease? |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
The elephant seal populations breeding on the Îles Crozet and Kerguelen were regularly surveyed over the last three decades. At Îles Kerguelen the number of breeding females decreased at an annual rate of 3.6% between 1970 and 1987, then increased at an annual rate of 1.1% to 1997. At Îles Crozet, the population was reported to decrease at a rate of 5.35% between 1970 and 1990 but no change in numbers was found between 1990 and 1997. These results indicate that the rapid decline observed both at Îles Crozet and Îles Kerguelen has ended, and these populations are now either stable or slightly increasing. We suggest that broad scale change in environmental factors affecting the food availability for elephant seals may be responsible for the change in numbers of these marine predators. The higher rate of decrease, the longer period of decline, and the absence of any significant change between 1990 and 1997 observed on the Îles Crozet may be explained by additional factors such as killer whale predation. |
format |
Article in Journal/Newspaper |
author |
Guinet, Christophe Jouventin, Pierre Weimerskirch, Henri |
author_facet |
Guinet, Christophe Jouventin, Pierre Weimerskirch, Henri |
author_sort |
Guinet, Christophe |
title |
Recent population change of the southern elephant seal at Îles Crozet and Îles Kerguelen: the end of the decrease? |
title_short |
Recent population change of the southern elephant seal at Îles Crozet and Îles Kerguelen: the end of the decrease? |
title_full |
Recent population change of the southern elephant seal at Îles Crozet and Îles Kerguelen: the end of the decrease? |
title_fullStr |
Recent population change of the southern elephant seal at Îles Crozet and Îles Kerguelen: the end of the decrease? |
title_full_unstemmed |
Recent population change of the southern elephant seal at Îles Crozet and Îles Kerguelen: the end of the decrease? |
title_sort |
recent population change of the southern elephant seal at îles crozet and îles kerguelen: the end of the decrease? |
publisher |
Cambridge University Press (CUP) |
publishDate |
1999 |
url |
http://dx.doi.org/10.1017/s0954102099000255 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102099000255 |
long_lat |
ENVELOPE(69.167,69.167,-49.250,-49.250) |
geographic |
Îles Kerguelen Kerguelen |
geographic_facet |
Îles Kerguelen Kerguelen |
genre |
Antarctic Science Elephant Seal Elephant Seals Îles Crozet Killer Whale Southern Elephant Seal Killer whale |
genre_facet |
Antarctic Science Elephant Seal Elephant Seals Îles Crozet Killer Whale Southern Elephant Seal Killer whale |
op_source |
Antarctic Science volume 11, issue 2, page 193-197 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102099000255 |
container_title |
Antarctic Science |
container_volume |
11 |
container_issue |
2 |
container_start_page |
193 |
op_container_end_page |
197 |
_version_ |
1792495038157029376 |