CEPHALOPOD PREY OF THE SOUTHERN ELEPHANT SEAL, MIROUNGA-LEONINA L
In the austral summers of 1986 and 1988 - 1989, 51 southern elephant seals (Mirounga leonina) at Husvik, South Georgia (54-degrees 10'S; 36-degrees 43'W), were stomach lavaged after chemical immobilization. Only cephalopod remains were retrieved, including 1070 lower beaks that were identi...
Published in: | Canadian Journal of Zoology |
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Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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1992
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/cephalopod-prey-of-the-southern-elephant-seal-miroungaleonina-l(6f1eef4e-aab5-4361-8043-c4bb2c3d4925).html https://doi.org/10.1139/z92-143 |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/6f1eef4e-aab5-4361-8043-c4bb2c3d4925 2023-05-15T13:35:46+02:00 CEPHALOPOD PREY OF THE SOUTHERN ELEPHANT SEAL, MIROUNGA-LEONINA L RODHOUSE, P G ARNBOM, T R FEDAK, M A YEATMAN, J MURRAY, A W A 1992-05 https://risweb.st-andrews.ac.uk/portal/en/researchoutput/cephalopod-prey-of-the-southern-elephant-seal-miroungaleonina-l(6f1eef4e-aab5-4361-8043-c4bb2c3d4925).html https://doi.org/10.1139/z92-143 eng eng info:eu-repo/semantics/restrictedAccess RODHOUSE , P G , ARNBOM , T R , FEDAK , M A , YEATMAN , J & MURRAY , A W A 1992 , ' CEPHALOPOD PREY OF THE SOUTHERN ELEPHANT SEAL, MIROUNGA-LEONINA L ' , Canadian Journal of Zoology , vol. 70 , no. 5 , pp. 1007-1015 . https://doi.org/10.1139/z92-143 FEEDING-HABITS article 1992 ftunstandrewcris https://doi.org/10.1139/z92-143 2021-12-26T14:18:54Z In the austral summers of 1986 and 1988 - 1989, 51 southern elephant seals (Mirounga leonina) at Husvik, South Georgia (54-degrees 10'S; 36-degrees 43'W), were stomach lavaged after chemical immobilization. Only cephalopod remains were retrieved, including 1070 lower beaks that were identified and measured. In total these were estimated to represent a wet weight of 187.8 kg. Fourteen species of squid from 11 families and 2 species of octopod from 1 family were present. The most important species overall were the squids Psychroteuthis glacialis in terms of numerical abundance (33.7%) and Moroteuthis knipovitchi in terms of estimated biomass (31.2%). The remaining biomass was mainly comprised of the five large muscular squids, Kondakovia longimana (24.0%), P. glacialis (15.4%), Martialia hyadesi (11.2%), Alluroteuthis antarcticus (10.8%), and Gonatus antarcticus (3.6%). Larger seals of both sexes fed on a wider variety of cephalopod species than smaller seals, with large males taking the greatest diversity. Between the two summers of the study there were some changes in the relative importance of the various cephalopod species consumed; in particular, in 1988-1989 M. knipovitchi and M. hyadesi were less important and P. glacialis was more important. The taxa arid size of cephalopods taken by southern elephant seals at South Georgia are almost identical to those taken by the grey-headed albatross (Diomedea chrysostoma), but the relative proportions are quite different. The biogeography of the cephalopods eaten suggests that southern elephant seals sampled at South Georgia do not forage to die north of the Antarctic Polar Front but probably travel southwards towards the Antarctic continent or Peninsula. Article in Journal/Newspaper Antarc* Antarctic antarcticus Elephant Seal Elephant Seals Mirounga leonina Southern Elephant Seal Southern Elephant Seals University of St Andrews: Research Portal Antarctic Austral The Antarctic Canadian Journal of Zoology 70 5 1007 1015 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
FEEDING-HABITS |
spellingShingle |
FEEDING-HABITS RODHOUSE, P G ARNBOM, T R FEDAK, M A YEATMAN, J MURRAY, A W A CEPHALOPOD PREY OF THE SOUTHERN ELEPHANT SEAL, MIROUNGA-LEONINA L |
topic_facet |
FEEDING-HABITS |
description |
In the austral summers of 1986 and 1988 - 1989, 51 southern elephant seals (Mirounga leonina) at Husvik, South Georgia (54-degrees 10'S; 36-degrees 43'W), were stomach lavaged after chemical immobilization. Only cephalopod remains were retrieved, including 1070 lower beaks that were identified and measured. In total these were estimated to represent a wet weight of 187.8 kg. Fourteen species of squid from 11 families and 2 species of octopod from 1 family were present. The most important species overall were the squids Psychroteuthis glacialis in terms of numerical abundance (33.7%) and Moroteuthis knipovitchi in terms of estimated biomass (31.2%). The remaining biomass was mainly comprised of the five large muscular squids, Kondakovia longimana (24.0%), P. glacialis (15.4%), Martialia hyadesi (11.2%), Alluroteuthis antarcticus (10.8%), and Gonatus antarcticus (3.6%). Larger seals of both sexes fed on a wider variety of cephalopod species than smaller seals, with large males taking the greatest diversity. Between the two summers of the study there were some changes in the relative importance of the various cephalopod species consumed; in particular, in 1988-1989 M. knipovitchi and M. hyadesi were less important and P. glacialis was more important. The taxa arid size of cephalopods taken by southern elephant seals at South Georgia are almost identical to those taken by the grey-headed albatross (Diomedea chrysostoma), but the relative proportions are quite different. The biogeography of the cephalopods eaten suggests that southern elephant seals sampled at South Georgia do not forage to die north of the Antarctic Polar Front but probably travel southwards towards the Antarctic continent or Peninsula. |
format |
Article in Journal/Newspaper |
author |
RODHOUSE, P G ARNBOM, T R FEDAK, M A YEATMAN, J MURRAY, A W A |
author_facet |
RODHOUSE, P G ARNBOM, T R FEDAK, M A YEATMAN, J MURRAY, A W A |
author_sort |
RODHOUSE, P G |
title |
CEPHALOPOD PREY OF THE SOUTHERN ELEPHANT SEAL, MIROUNGA-LEONINA L |
title_short |
CEPHALOPOD PREY OF THE SOUTHERN ELEPHANT SEAL, MIROUNGA-LEONINA L |
title_full |
CEPHALOPOD PREY OF THE SOUTHERN ELEPHANT SEAL, MIROUNGA-LEONINA L |
title_fullStr |
CEPHALOPOD PREY OF THE SOUTHERN ELEPHANT SEAL, MIROUNGA-LEONINA L |
title_full_unstemmed |
CEPHALOPOD PREY OF THE SOUTHERN ELEPHANT SEAL, MIROUNGA-LEONINA L |
title_sort |
cephalopod prey of the southern elephant seal, mirounga-leonina l |
publishDate |
1992 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/cephalopod-prey-of-the-southern-elephant-seal-miroungaleonina-l(6f1eef4e-aab5-4361-8043-c4bb2c3d4925).html https://doi.org/10.1139/z92-143 |
geographic |
Antarctic Austral The Antarctic |
geographic_facet |
Antarctic Austral The Antarctic |
genre |
Antarc* Antarctic antarcticus Elephant Seal Elephant Seals Mirounga leonina Southern Elephant Seal Southern Elephant Seals |
genre_facet |
Antarc* Antarctic antarcticus Elephant Seal Elephant Seals Mirounga leonina Southern Elephant Seal Southern Elephant Seals |
op_source |
RODHOUSE , P G , ARNBOM , T R , FEDAK , M A , YEATMAN , J & MURRAY , A W A 1992 , ' CEPHALOPOD PREY OF THE SOUTHERN ELEPHANT SEAL, MIROUNGA-LEONINA L ' , Canadian Journal of Zoology , vol. 70 , no. 5 , pp. 1007-1015 . https://doi.org/10.1139/z92-143 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1139/z92-143 |
container_title |
Canadian Journal of Zoology |
container_volume |
70 |
container_issue |
5 |
container_start_page |
1007 |
op_container_end_page |
1015 |
_version_ |
1766070007700127744 |