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Spatial and temporal variability in the fish diet of Antarctic fur seal (Arctocephalus gazella) in the Atlantic sector of the Southern Ocean

Reid, Keith; Davis, Dexter; Staniland, Iain J.. 2006 Spatial and temporal variability in the fish diet of Antarctic fur seal (Arctocephalus gazella) in the Atlantic sector of the Southern Ocean. Canadian Journal of Zoology, 84 (7). 1025-1037. 10.1139/Z06-071

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Abstract/Summary

The spatial and temporal variability in the fish component of the diet of Antarctic fur seals (Arctocephalus gazella (Peters, 1875)) in the Atlantic sector of the Southern Ocean was examined using diet data from 10 sites in the region including a 13-year time series from South Georgia. The fish species composition in the diet at each site showed a strong relationship with the local marine habitat/topography. The absence of formerly harvested fish species indicates a lack of recovery of stocks of Notothenia rossii Richardson, 1844 at South Georgia and Champsocephalus gunnari Lönnberg, 1905 at the South Orkney Islands. At South Georgia, Protomyctophum choriodon Hulley, 1981, Lepidonotothen larseni (Lönnberg, 1905), and C.gunnari were the most important species in the diet between 1991 and 2004. Variability in the occurrence of C. gunnari was driven mainly by annual scale processes, particularly those that influence the availability of Antarctic krill (Euphausia superba (Dana, 1852)). The occurrence of the pelagic P. choriodon was primarily influenced by shorter-term water mass changes within the foraging range of the seals. The fish composition in the diet reflects differences in marine habitat/topography, as well as variability, at a range of time scales that reflect environmental variability and harvesting.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1139/Z06-071
Programmes: BAS Programmes > Global Science in the Antarctic Context (2005-2009) > DISCOVERY 2010 - Integrating Southern Ocean Ecosystems into the Earth System
ISSN: 0008-4301
Additional Information. Not used in RCUK Gateway to Research.: Full text not available from this repository
Additional Keywords: Fur seals
NORA Subject Terms: Zoology
Date made live: 11 Sep 2007 13:26
URI: http://nora.nerc.ac.uk/id/eprint/966

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