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The foraging ecology of an oceanic squid, Todarodes filippovae: The use of signature lipid profiling to monitor ecosystem change


Pethybridge, HR and Nichols, PD and Virtue, P and Jackson, GD, The foraging ecology of an oceanic squid, Todarodes filippovae: The use of signature lipid profiling to monitor ecosystem change, Deep-Sea Research Part II, 95 pp. 119-128. ISSN 0967-0645 (2013) [Refereed Article]

Copyright Statement

Copyright 2012 Elsevier Ltd.

DOI: doi:10.1016/j.dsr2.2012.07.025


Signature lipid/fatty acid and stomach content analyses were used in combination to examine the feeding ecology of Todarodes filippovae, an abundant oceanic squid with a broad circumpolar distribution in continental slope waters in the Southern Ocean. Both techniques show a diet that is closely linked to prey availability and abundance, with some specialisation occurring for Myctophid fishes which dominated the diet numerically and taxonomically. Mean monthly differences in total lipid content of the digestive gland correlated with satellite-derived sea surface chlorophyll, illustrating that the diet is closely linked to short-term (monthly) temporal changes of primary productivity. Multidimensional scaling analysis of prey and T. filippovae signature fatty acid profiles revealed apparent intra-specific predator to prey relationships. Significant season versus site interactions for various lipid classes and fatty acids were observed, further indicating that temporal dietary shifts are related to site-specific oceanography and ecosystem structure (prey composition and/or productivity). Comparing fatty acid profiles with other Southern Ocean squid species, interspecific similarities and differences in diet composition were evident. Results demonstrate that signature lipid profiling of squid can be used as a complimentary or even alternative and cost effective tool to examine key changes in prey-community structure and ecosystem productivity. Such knowledge is fundamental to better understanding the effects of environmental perturbations from fisheries, climate change and pollution.

Item Details

Item Type:Refereed Article
Keywords:biochemical tracers, signature fatty acids, trophic ecology, lipid dynamicsc Ommastrephid, cephalopods
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and estuarine ecology (incl. marine ichthyology)
Objective Division:Environmental Management
Objective Group:Marine systems and management
Objective Field:Marine biodiversity
UTAS Author:Pethybridge, HR (Miss Heidi Pethybridge)
UTAS Author:Nichols, PD (Dr Peter Nichols)
UTAS Author:Virtue, P (Associate Professor Patti Virtue)
ID Code:85181
Year Published:2013
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2013-06-17
Last Modified:2014-05-27

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