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  • 1
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    Adult male southern elephant seals from King George Island utilize the Weddell Sea (2009)
    Cambridge Univ. Press
    In:  Antarctic Science, 21 (2). pp. 113-121.
    Details
    Publication Date: 2019-07-03
    Description: Adult male southern elephant seals instrumented in 2000 on King George Island (n = 13), travelled both to the north (n = 2) and to the east (n = 6) of the Antarctic Peninsula. Five males remained within 500 km of the island focusing movements in the Bransfield Strait and around the Antarctic Peninsula. Sea surface temperatures encountered by these animals showed little variation. While animal trajectories appeared unaffected by sea ice cover, areas of shallow depths were frequented. Three males moved as far as 75°S to the east of the Peninsula with maximum distances of more than 1500 km from King George Island. They travelled into the Weddell Sea along the western continental shelf break until they reached the region of the Filchner Trough outflow. Here the sea floor consists of canyons and ridges that support intensive mixing between the warm saline waters of the Weddell Gyre, the very cold outflow waters and ice shelf water at the Antarctic Slope Front. The need for re-instrumentation of adult males from King George Island is highlighted to investigate whether males continue to travel to similar areas and to obtain higher resolution data.
    Type: Article , PeerReviewed
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  • 2
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    Cephalopod Prey of the Sub-Antarctic Fur Seal, Arctocephalus tropicalis, at Gough Island (1985)
    Springer
    In:  In: Antarctic Nutrient Cycles and Food Webs. , ed. by Siegfried, W. R., Condy, P. R. and Laws, R. M. Springer, Berlin, Germany, pp. 551-554. ISBN 978-3-642-82277-3
    Details
    Publication Date: 2020-06-11
    Description: The Sub-Antarctic Fur Seal, Arctocephalus tropicalis, at Gough Island preys predominantly on cephalopods, but includes relatively small quantities of fish in its diet. Stomachs of Fur Seals (n = 220) culled on land were either empty (32%), contained only stones (8%) or contained almost exclusively prey remains resistant to digestion, such as cephalopod pens, ‘beaks’, eye balls, fish bones and otoliths. The pooled cephalopod lower beaks (n = 424) that could be identified (n = 337), showed that Ommastrephidae (52.5%), Histioteuthidae (25.2%), Onychoteuthidae (19.9%), Cranchiidae (2.1%) and Octopoteuthidae (0.3%) constituted the main prey items based on frequency of occurrence. Cephalopod mass estimates, from regression of lower rostral lengths against mass, approximated this relative arrangement of cephalopod families.
    Type: Book chapter , NonPeerReviewed
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  • 3
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    Fish prey of fur seals Arctocephalus spp. at subantarctic Marion Island (1998)
    Springer
    In:  Marine Biology, 131 (3). pp. 559-566.
    Details
    Publication Date: 2021-04-22
    Description: The analysis of scats collected between 1989 and 1995 from the two fur seal species resident on subantarctic Marion Island, Arctocephalus gazella and A. tropicalis, showed that they fed predominantly on fish of the family Myctophidae (lanternfishes). Scat composition (prey species, abundance) was very similar for the two species. The seven species of myctophids that formed numerically 90 and 86% of the scat composition for A. gazella and A. tropicalis, respectively, all showed seasonal fluctuations in their contribution to seal diets. Electrona carlsbergi, E. subaspera, Metelectrona ventralis and Gymnoscopelus fraseri increased in winter in both species of fur seals, whereas Gymnoscopelus piabilis, Protomyctophum choriodon and P. tenisoni showed the opposite trend. Seal diets overlapped substantially with those of the king penguins (Aptenodytes patagonicus) resident on Marion Island, but no evidence for competitive exclusion could be found between these two major warmblooded consumers of marine resources at the Prince Edward Islands.
    Type: Article , PeerReviewed
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  • 4
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    Temporal variation of cephalopods in the diet of Cape fur seals in Namibia (2003)
    Southern African Wildlife Management Association
    In:  South African Journal of Wildlife Research, 33 (2). pp. 85-96.
    Details
    Publication Date: 2021-08-03
    Description: Cape fur seal (Arctocephalus pusillus pusillus) scats were sampled over a period of eight years (1994-2001) at Atlas and Wolf Bay seal colonies in order to assess the cephalopod component of the diet of these seals and cephalopod diversity off the coast of Namibia. The temporal variation within the cephalopod component was investigated. A low diversity of cephalopods, only six species, are preyed upon, with Todarodes angolensis being the most important component both in numbers and wet weight in all years. Its lowered weight contribution during winter coincided with a greater diversity of other cephalopod species in the diet, which showed higher proportional weight contribution relative to Todarodes angolensis. Scat sampling was found to be an unreliable method of providing estimates of total prey weight consumption by seals, but was considered an acceptable method for proportional comparisons, especially given the ease of scat collection over extended periods.
    Type: Article , PeerReviewed
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  • 5
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    Diet and estimated food consumption of Antarctic fur seals at Bouvetøya during summer (2000)
    Springer
    In:  Polar Biology, 23 (11). pp. 745-752.
    Details
    Publication Date: 2021-06-30
    Description: Collection and analysis of natural regurgitations and fresh scats, deposited by Antarctic fur seals at the Nyrøysa colony, Bouvetøya, during December 1998 to February 1999, afforded a comprehensive description of the dietary composition of this expanding population during the summer months. Mature, adult Euphausia superba was the staple diet of fur seals at Nyrøysa, while squid and myctophid fish appeared to be taken opportunistically. In metric tons, the total Bouvetøya fur seal population is estimated to have consumed a minimum of 14,365 t krill (representing 1.2713 × 1010 individuals of 1.13 g mass), 186 t fish, 184 t squid and 14,735 t over 3 months, but there are many possible sources of error in these estimates. It is presumed that over-indulgence in krill may cause animals to regurgitate ashore.
    Type: Article , PeerReviewed
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