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

van Tonder, A.; Lübcker, N.; Guerreiro, M.; Xavier, J.C. ORCID: https://orcid.org/0000-0002-9621-6660; Cherel, Y.; de Bruyn, P.J.N.. 2021 Ecology of Moroteuthopsis longimana at the sub-Antarctic Prince Edward Islands, revealed through stable isotope analysis of squid beaks. Marine Ecology Progress Series, 658. 105-115. https://doi.org/10.3354/meps13556

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Official URL: https://www.int-res.com/abstracts/meps/v658/p105-1...

Abstract/Summary

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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.3354/meps13556
ISSN:	0171-8630
Additional Keywords:	Cephalopods · Moroteuthopsis longimana · Ontogeny · Southern Ocean · Stable isotope analysis · Prince Edward Islands · Thalassarche chrysostoma
Date made live:	26 Jan 2021 09:25 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/529486

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.3354/meps13556

ISSN:

0171-8630

Additional Keywords:

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

Date made live:

26 Jan 2021 09:25 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/529486