| The diet of toothfish species Dissostichus eleginoides and Dissostichus mawsoni with overlapping distributions. | |
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MedLine Citation:
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PMID: 21722116 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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The diets of Antarctic toothfish Dissostichus mawsoni and Patagonian toothfish Dissostichus eleginoides were examined around the South Sandwich Islands in the Southern Ocean, one of few regions with overlapping populations of the two species. Despite large differences in the proportion of stomachs containing prey (76·2% of D. mawsoni compared to 7·2% of D. eleginoides), diet composition was broadly similar (Schoener overlap index of 74·4% based on prey mass) with finfishes (particularly macrourids and muraenolepidids) and cephalopods (mainly Kondakovia longimana) comprising >90% of the prey mass of both species. Predation rates of the main fish prey, as mean counts per stomach sampled, were spatially correlated with their relative abundance around the islands derived from fishery by-catch data, suggesting a general lack of prey selectivity. This study supports the view that bathyal Dissostichus are opportunistic carnivores and finds that D. mawsoni and D. eleginoides occupy a similar trophic niche and are likely to compete for prey in regions where both are distributed. The large increase in rate of prey occurrence and size of prey in D. mawsoni stomachs relative to D. eleginoides suggests, however, species differences in feeding behaviour, which may reflect the increased metabolic demands of a cold-water adapted physiology. [Correction added after online publication 13 June 2011: spelling of species name corrected]. |
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Authors:
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J Roberts; J C Xavier; D J Agnew |
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Publication Detail:
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Type: Journal Article Date: 2011-06-07 |
Journal Detail:
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Title: Journal of fish biology Volume: 79 ISSN: 1095-8649 ISO Abbreviation: J. Fish Biol. Publication Date: 2011 Jul |
Date Detail:
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Created Date: 2011-07-04 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0214055 Medline TA: J Fish Biol Country: England |
Other Details:
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Languages: eng Pagination: 138-54 Citation Subset: IM |
Copyright Information:
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© 2011 The Authors. Journal of Fish Biology © 2011 The Fisheries Society of the British Isles. |
Affiliation:
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Division of Biology, Imperial College London, Silwood Park Campus, Buckhurst Road, Ascot, Berkshire SL5 7PY, U.K. Institute of Marine Research, Department of Life Sciences, Apart 3046, University of Coimbra, 3001-401 Coimbra, Portugal British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, CB3 0ET Cambridge, U.K. MRAG Ltd, 18 Queen Street, London WIJ 5PN, U.K. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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