The diet of the subantarctic fur seal Arctocephalus tropicalis at Marion Island
Scats of subantarctic fur seals Arctocephalus tropicalis at Marion Island were collected from 1996 to 2,000, to examine temporal variability in the diet, factors affecting the variability and how the diet differed from that of the Antarctic fur seal A. gazella in the same period. For A. tropicalis,...
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ftunivpretoria:oai:repository.up.ac.za:2263/37197 2023-05-15T13:22:33+02:00 The diet of the subantarctic fur seal Arctocephalus tropicalis at Marion Island Makhado, Azwianewi Benedict Bester, Marthan Nieuwoudt 2013-11 http://hdl.handle.net/2263/37197 https://doi.org/10.1007/s00300-013-1380-y en eng Springer http://hdl.handle.net/2263/37197 Makhado, AB, Bester, MN, Somhlaba, S & Crawford, RJM 2013, 'The diet of the subantarctic fur seal Arctocephalus tropicalis at Marion Island', Polar Biology, vol. 36, no. 11, pp. 1609-1617. 0722-4060 (print) 1432-2056 (online) doi:10.1007/s00300-013-1380-y © Springer-Verlag Berlin Heidelberg 2013.The original publication is available at : http://link.springer.com/journal/300 Arctocephalus tropicalis Arctocephalus gazella Diet Prey availability Scat analyses Postprint Article 2013 ftunivpretoria https://doi.org/10.1007/s00300-013-1380-y 2022-05-31T13:25:33Z Scats of subantarctic fur seals Arctocephalus tropicalis at Marion Island were collected from 1996 to 2,000, to examine temporal variability in the diet, factors affecting the variability and how the diet differed from that of the Antarctic fur seal A. gazella in the same period. For A. tropicalis, 19 prey species, of which 18 were fish and one a cephalopod, were identified in 213 scats. Fish were the main prey, occurring in 98.1 % of scats, whereas the cephalopod was present in only 1.4 % of scats. Amongst fish species, Myctophidae were most abundant, with Gymnoscopelus piabilis, G. fraseri and Electrona carlsbergi being the commonest prey items. Other fish families present in the diet in small numbers were Channichthyidae, Paralepididae, Nototheniidae, Microstomatidae and Notosudidae. Fish eaten ranged in size from Protomyctophum bolini and Krefftichthys anderssoni of standard length (SL) 25 mm to a single Dissostichus eleginoides of SL 249 mm. Differences in the diet existed between summer and winter. However, prey type accounted for most variability in the diet. In previous studies based on scats, a dominance of fish in the diet of A. tropicalis was also found at Possession Island (Iles Crozet), Amsterdam Island and Macquarie Island, but the dominant prey species differed between the various localities, also suggesting that prey availability is a major determinant of diet. At Marion Island, from 1996 to 2000 the diet of A. gazella comprised similar prey to that of A. tropicalis, but the proportional contribution of prey types differed in instances. National Research Foundation (NRF) and the University of Pretoria (UP), Department of Environmental Affairs. http://link.springer.com/journal/300 hb2014 Article in Journal/Newspaper Amsterdam Island Antarc* Antarctic Antarctic Fur Seal Arctocephalus gazella Macquarie Island Marion Island Polar Biology Possession Island University of Pretoria: UPSpace Antarctic The Antarctic Possession Island ENVELOPE(171.200,171.200,-71.867,-71.867) Polar Biology 36 11 1609 1617 |
institution |
Open Polar |
collection |
University of Pretoria: UPSpace |
op_collection_id |
ftunivpretoria |
language |
English |
topic |
Arctocephalus tropicalis Arctocephalus gazella Diet Prey availability Scat analyses |
spellingShingle |
Arctocephalus tropicalis Arctocephalus gazella Diet Prey availability Scat analyses Makhado, Azwianewi Benedict Bester, Marthan Nieuwoudt The diet of the subantarctic fur seal Arctocephalus tropicalis at Marion Island |
topic_facet |
Arctocephalus tropicalis Arctocephalus gazella Diet Prey availability Scat analyses |
description |
Scats of subantarctic fur seals Arctocephalus tropicalis at Marion Island were collected from 1996 to 2,000, to examine temporal variability in the diet, factors affecting the variability and how the diet differed from that of the Antarctic fur seal A. gazella in the same period. For A. tropicalis, 19 prey species, of which 18 were fish and one a cephalopod, were identified in 213 scats. Fish were the main prey, occurring in 98.1 % of scats, whereas the cephalopod was present in only 1.4 % of scats. Amongst fish species, Myctophidae were most abundant, with Gymnoscopelus piabilis, G. fraseri and Electrona carlsbergi being the commonest prey items. Other fish families present in the diet in small numbers were Channichthyidae, Paralepididae, Nototheniidae, Microstomatidae and Notosudidae. Fish eaten ranged in size from Protomyctophum bolini and Krefftichthys anderssoni of standard length (SL) 25 mm to a single Dissostichus eleginoides of SL 249 mm. Differences in the diet existed between summer and winter. However, prey type accounted for most variability in the diet. In previous studies based on scats, a dominance of fish in the diet of A. tropicalis was also found at Possession Island (Iles Crozet), Amsterdam Island and Macquarie Island, but the dominant prey species differed between the various localities, also suggesting that prey availability is a major determinant of diet. At Marion Island, from 1996 to 2000 the diet of A. gazella comprised similar prey to that of A. tropicalis, but the proportional contribution of prey types differed in instances. National Research Foundation (NRF) and the University of Pretoria (UP), Department of Environmental Affairs. http://link.springer.com/journal/300 hb2014 |
format |
Article in Journal/Newspaper |
author |
Makhado, Azwianewi Benedict Bester, Marthan Nieuwoudt |
author_facet |
Makhado, Azwianewi Benedict Bester, Marthan Nieuwoudt |
author_sort |
Makhado, Azwianewi Benedict |
title |
The diet of the subantarctic fur seal Arctocephalus tropicalis at Marion Island |
title_short |
The diet of the subantarctic fur seal Arctocephalus tropicalis at Marion Island |
title_full |
The diet of the subantarctic fur seal Arctocephalus tropicalis at Marion Island |
title_fullStr |
The diet of the subantarctic fur seal Arctocephalus tropicalis at Marion Island |
title_full_unstemmed |
The diet of the subantarctic fur seal Arctocephalus tropicalis at Marion Island |
title_sort |
diet of the subantarctic fur seal arctocephalus tropicalis at marion island |
publisher |
Springer |
publishDate |
2013 |
url |
http://hdl.handle.net/2263/37197 https://doi.org/10.1007/s00300-013-1380-y |
long_lat |
ENVELOPE(171.200,171.200,-71.867,-71.867) |
geographic |
Antarctic The Antarctic Possession Island |
geographic_facet |
Antarctic The Antarctic Possession Island |
genre |
Amsterdam Island Antarc* Antarctic Antarctic Fur Seal Arctocephalus gazella Macquarie Island Marion Island Polar Biology Possession Island |
genre_facet |
Amsterdam Island Antarc* Antarctic Antarctic Fur Seal Arctocephalus gazella Macquarie Island Marion Island Polar Biology Possession Island |
op_relation |
http://hdl.handle.net/2263/37197 Makhado, AB, Bester, MN, Somhlaba, S & Crawford, RJM 2013, 'The diet of the subantarctic fur seal Arctocephalus tropicalis at Marion Island', Polar Biology, vol. 36, no. 11, pp. 1609-1617. 0722-4060 (print) 1432-2056 (online) doi:10.1007/s00300-013-1380-y |
op_rights |
© Springer-Verlag Berlin Heidelberg 2013.The original publication is available at : http://link.springer.com/journal/300 |
op_doi |
https://doi.org/10.1007/s00300-013-1380-y |
container_title |
Polar Biology |
container_volume |
36 |
container_issue |
11 |
container_start_page |
1609 |
op_container_end_page |
1617 |
_version_ |
1766365451066015744 |