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Marine Ecology Progress Series

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MEPS 658:105-115 (2021)  -  DOI:

Ecology of Moroteuthopsis longimana at the sub-Antarctic Prince Edward Islands, revealed through stable isotope analysis of squid beaks

André van Tonder1,*, Nico Lübcker1, Miguel Guerreiro2,3, José C. Xavier2,4, Yves Cherel5, P. J. Nico de Bruyn1

1Mammal Research Institute, Department of Zoology and Entomology, University of Pretoria, Private Bag X20, Hatfield, South Africa 0028
2Laboratório Marítimo da Guia MARE - Marine and Environmental Sciences Centre, Faculdade de Ciências da Universidade de Lisboa Av. Nossa Senhora do Cabo, 939, 2750-374 Cascais, Portugal
3GEOMAR Helmholtz Centre for Ocean Research, Düsternbrooker Weg 20, 24105 Kiel, Germany
4British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
5Centre d’Etudes Biologiques de Chizé, UMR 7372 du CNRS-La Rochelle Université, 79360 Villiers-en-Bois, France
*Corresponding author:

ABSTRACT: Understanding the underlying ecological factors that affect the distribution patterns of organisms is vital for their conservation. Cephalopods such as giant warty squids Moroteuthopsis longimana are important in the diets of marine predators, including grey-headed albatrosses Thalassarche chrysostoma, yet our understanding of their habitat and trophic ecology remains limited. We investigated the habitat and trophic niche utilised by M. longimana through the δ13C and δ15N profiles captured in their beaks. M. longimana beaks were collected around grey-headed albatross nests at the Prince Edward Islands during 2004 and 2013 (n = 40 beaks). The results showed distinctly Antarctic distributions (δ13C = -24.0 ± 1.0‰, mean ± SD) for M. longimana, consistent with albatrosses foraging at the Southwest Indian Ridge, as opposed to broader foraging zones utilised by albatrosses from Îles Crozet and Îles Kerguelen. Slightly lower δ15N values (5.4 ± 0.7‰) were found compared to other islands in the Indian Sector of the Southern Ocean, which may indicate more crustaceans in the squid diets. Sequential sampling along the lateral walls of individual beaks (n = 4) revealed ontogenetic shifts in δ13C and δ15N values, but individual variation in these shifts requires further investigation.

KEY WORDS: Cephalopods · Moroteuthopsis longimana · Ontogeny · Southern Ocean · Stable isotope analysis · Prince Edward Islands · Thalassarche chrysostoma

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Cite this article as: van Tonder A, Lübcker N, Guerreiro M, Xavier JC, Cherel Y, de Bruyn PJN (2021) Ecology of Moroteuthopsis longimana at the sub-Antarctic Prince Edward Islands, revealed through stable isotope analysis of squid beaks. Mar Ecol Prog Ser 658:105-115.

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