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Vertical distribution of lipids, fatty acids and organochlorine contaminants in the blubber of southern hemisphere humpback whales (Megaptera novaeangliae)

Citation

Waugh, CA and Nichols, PD and Schlabach, M and Noad, M and Nash, SB, Vertical distribution of lipids, fatty acids and organochlorine contaminants in the blubber of southern hemisphere humpback whales (Megaptera novaeangliae), Marine Environmental Research, 94 pp. 24-31. ISSN 0141-1136 (2014) [Refereed Article]

Copyright Statement

Copyright 2013 Elsevier Ltd

DOI: doi:10.1016/j.marenvres.2013.11.004

Abstract

Persistent organic pollutants (POPs), such as toxic lipophilic organochlorine (OC) compounds, accumulate in the blubber tissue of marine mammals. Toxicological sampling methods most frequently target only the superficial blubber layer. Vertical distribution of these contaminants through the blubber mantle may, however, not be homogenous and could reflect any dissemination of lipids and fatty acids (FAs). It is therefore critical to assess stratification patterns in a species of interest as a quality control measure for interpretation of toxicological data. Here, we analysed and compared the distribution of lipids, FAs, and OCs in the outermost and innermost blubber layer of southern hemisphere humpback whales. FA stratification was evident for short-chain (≤18) monounsaturated fatty acids (SC-MUFA), which were concentrated in the outer layer, consistent with the thermoregulatory role of this blubber layer. This stratification was, however, not reflected in OC distribution, which was similar in the inner and outer blubber layers of male humpback whales. By comparison, a noticeable gradient in total blubber lipid from the outer to the inner layer was observed in two lactating females, which coincided with higher lipid normalised contaminant levels in the inner layer. This study contains the most comprehensive assessment of humpback whale blubber stratification to date, however, further investigation of biological and ecological influencing factors is required.

Item Details

Item Type:Refereed Article
Keywords:southern hemisphere humpback whales, blubber stratification, lipids, fatty acids, persistent organic pollutants, Antarctica
Research Division:Biological Sciences
Research Group:Physiology
Research Field:Animal Physiology - Systems
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Antarctic and Sub-Antarctic Flora, Fauna and Biodiversity
Author:Nichols, PD (Dr Peter Nichols)
ID Code:118613
Year Published:2014
Web of Science® Times Cited:18
Deposited By:IMAS - Directorate
Deposited On:2017-07-14
Last Modified:2017-08-31
Downloads:0

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