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Distribution of short-finned squid Illex argentinus (Cephalopoda: Ommastrephidae) inferred from the diets of Southern Ocean albatrosses using stable isotope analyses

Published online by Cambridge University Press:  08 June 2015

José Seco ,
Gustavo A. Daneri ,
Filipe R. Ceia ,
Rui Pedro Vieira ,
Simeon L. Hill  and
José Carlos Xavier
José Seco*
Affiliation:
Department of Life Sciences, Marine and Environmental Sciences Centre (MARE), University of Coimbra, 3001-401 Coimbra, Portugal
Gustavo A. Daneri
Affiliation:
División Mastozoología, Museo Argentino de Ciencias Naturales ‘Bernardino Rivadavia’: Ciudad Autónoma de Buenos Aires, Argentina
Filipe R. Ceia
Affiliation:
Department of Life Sciences, Marine and Environmental Sciences Centre (MARE), University of Coimbra, 3001-401 Coimbra, Portugal
Rui Pedro Vieira
Affiliation:
Department of Life Sciences, Marine and Environmental Sciences Centre (MARE), University of Coimbra, 3001-401 Coimbra, Portugal Departamento de Biologia and CESAM, Universidade de Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal Graduate School of the National Oceanography Centre Southampton, University of Southampton, Waterfront Campus, European Way, Southampton SO14 3 ZH, UK
Simeon L. Hill
Affiliation:
British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
José Carlos Xavier
Affiliation:
Department of Life Sciences, Marine and Environmental Sciences Centre (MARE), University of Coimbra, 3001-401 Coimbra, Portugal British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
*
Correspondence should be addressed to:J. Seco, Department of Life Sciences, Marine and Environmental Sciences Centre (MARE), University of Coimbra, 3001-401 Coimbra, Portugal email: [email protected]
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Abstract

The diets of marine predators are a potential source of information about range shifts in their prey. For example, the short-finned squid Illex argentinus, a commercially fished species on the Patagonian Shelf in the South Atlantic, has been reported in the diet of grey-headed, Thalassarche chrysostoma; black-browed, T. melanophris; and wandering, Diomedea exulans, albatrosses breeding at Bird Island, South Georgia (54°S 28°W) in the Southern Ocean. Tracking data suggest that these birds may feed on I. argentinus while foraging in Southern Ocean waters during their breeding season. This led to the hypothesis that I. argentinus may occur south of the Antarctic Polar Front. To test this hypothesis, we used stable isotope analyses to assess the origin of I. argentinus. We compared I. argentinus beaks from the diets of the three albatross species with beaks of cephalopod species endemic to the Patagonian Shelf and others from the Southern Ocean. Our results show that I. argentinus from the diet of albatrosses at Bird Island have δ13C values in the range −18.77 to −15.28‰. This is consistent with δ13C values for Octopus tehuelchus, a typical species from the Patagonian Shelf. In contrast, Alluroteuthis antarcticus, a Southern Ocean squid, has typically Antarctic δ13C in the range −25.46 to −18.61‰. This suggests that I. argentinus originated from warmer waters of the Patagonian Shelf region. It is more likely that the albatross species obtained I. argentinus by foraging in the Patagonian Shelf region than that I. argentinus naturally occurs south of the Antarctic Polar Front.

Keywords

Trophic interactionsδ13CThalassarche chrysostomaThalassarche melanophrisDiomeda exulansPatagonian ShelfBird Island
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 96 , Issue 6 , September 2016 , pp. 1211 - 1215
Copyright
Copyright © Marine Biological Association of the United Kingdom 2015 

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