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Lipid and fatty acid composition of the mantle and digestive gland of four Southern Ocean squid species: implications for food-web studies

journal contribution
posted on 2023-05-16, 13:59 authored by Phillips, K, Nichols, PD, Jackson, GD
Lipid content, lipid class and fatty acid composition of four Southern Ocean cephalopod species - the myopsid Sepioteuthis australis and three oegopsids, Gonatus antarcticus, Moroteuthis robsoni and Todarodes spp. - were analysed. The lipid content of the digestive gland was consistently greater than that of the mantle, and was an order of magnitude greater in oegopsid species. The lipid class and fatty acid composition of the mantle and digestive gland also differed markedly in each species. Digestive gland lipid is likely to be of dietary origin, and large amounts of lipid in the digestive gland of oegopsids may accumulate over time. Thus the digestive gland is a rich source of fatty acid dietary tracers and may provide a history of dietary intake. However, the absolute amount of dietary lipid in the digestive gland of oegopsid species exceeds the absolute lipid content of mantle tissue. Therefore the overall lipid "signature" of an oegopsid may more closely resemble its prey species rather than its mantle tissue. When lipid techniques are used in dietary analysis of teuthophagous predators, squid may not be represented by a unique signature in analyses and their importance in the diets of predators may be underestimated.

History

Publication title

Antarctic Science

Volume

14

Pagination

212-220

ISSN

0954-1020

Department/School

Institute for Marine and Antarctic Studies

Publisher

Cambridge University Press

Place of publication

New York

Repository Status

  • Restricted

Socio-economic Objectives

Marine biodiversity

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