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The diving and ranging behaviour of southern elephant seal, Mirounga leonina, bulls
Dissertation (MSc (Zoology))--University of Pretoria, 1998.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2022
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| _version_ | 1867613524182695936 |
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| access_status_str | Open Access |
| author2 | Bester, Marthan Nieuwoudt |
| author_browse | Bester, Marthan Nieuwoudt |
| author_facet | Bester, Marthan Nieuwoudt |
| collection | Thesis |
| dc_rights_str_mv | © 2020 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MSc (Zoology))--University of Pretoria, 1998. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/85311 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:37:30.755Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/85311 The diving and ranging behaviour of southern elephant seal, Mirounga leonina, bulls Bester, Marthan Nieuwoudt Malherbe, Johan UCTD Diving and ranging behaviour southern elephant seal Mirounga leonina bulls Dissertation (MSc (Zoology))--University of Pretoria, 1998. Geolocation-Time-depth Recorders (GLTDRs) were used to record the diving and ranging behaviour of eleven southern elephant seal, Mirounga leonina, adult males from sub-Antarctic Marion ( n = 7) and Macquarie ( n = 4) Islands during their pelagic annual cycle. A total of 39 897 dives during 894 days were recorded and were categorised into twelve dive types which were hypothesized to serve in travelling, searching for prey, exploration, resting, benthic foraging, pelagic foraging and combinations of two or more functions, and seals dived virtually continuously (86%-92% of the time underwater) most often to depths ranging from 390 m to 920 m and dive durations from 18.6 min to 36.6 min (maximum duration= 80 min) spending only 2.4 min to 3.6 min on the surface between dives. Although the maximum measured dive depths for two males from Marion Island (1 446 m and I 452 m) are the deepest dives measured yet for male southern elephant seals, these seals often exceeded the depth limit of the GLTDRs. The Macquarie males travelled to Antarctica mostly foraging benthically over the Antarctic continental shelf whilst the males from Marion Island stayed relatively close to the island, diving deeper and longer pursuing pelagic prey species. The results in this study suggest that different physical environmental conditions resulted in the different diving behaviours displayed by M leonina males. 11 Zoology and Entomology MSc (Zoology) Unrestricted 2022-05-17T11:20:04Z 2022-05-17T11:20:04Z 2021/10/11 1998 Dissertation * https://repository.up.ac.za/handle/2263/85311 en © 2020 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Diving and ranging behaviour southern elephant seal Mirounga leonina bulls The diving and ranging behaviour of southern elephant seal, Mirounga leonina, bulls |
| title | The diving and ranging behaviour of southern elephant seal, Mirounga leonina, bulls |
| title_full | The diving and ranging behaviour of southern elephant seal, Mirounga leonina, bulls |
| title_fullStr | The diving and ranging behaviour of southern elephant seal, Mirounga leonina, bulls |
| title_full_unstemmed | The diving and ranging behaviour of southern elephant seal, Mirounga leonina, bulls |
| title_short | The diving and ranging behaviour of southern elephant seal, Mirounga leonina, bulls |
| title_sort | diving and ranging behaviour of southern elephant seal mirounga leonina bulls |
| topic | UCTD Diving and ranging behaviour southern elephant seal Mirounga leonina bulls |
| url | https://repository.up.ac.za/handle/2263/85311 |