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Isotopic evidence of a wide spectrum of feeding strategies in Southern Hemisphere humpback whale baleen records

Citation

Eisenmann, P and Fry, B and Holyoake, C and Coughran, D and Nicol, S and Nash, SB, Isotopic evidence of a wide spectrum of feeding strategies in Southern Hemisphere humpback whale baleen records, PLoS One, 11, (5) Article e0156698. ISSN 1932-6203 (2016) [Refereed Article]


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Copyright Statement

Copyright 2016 Eisenmann et al. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1371/journal.pone.0156698

Abstract

Our current understanding of Southern hemisphere humpback whale (Megaptera novaeangliae) ecology assumes high-fidelity feeding on Antarctic krill in Antarctic waters during summer, followed by fasting during their annual migration to and from equatorial breeding grounds. An increase in the number of reported departures from this feeding/fasting model suggests that the current model may be oversimplified or, alternatively, undergoing contemporary change. Information about the feeding and fasting cycles of the two Australian breeding populations of humpback whales were obtained through stable isotope analysis of baleen plates from stranded adult individuals. Comparison of isotope profiles showed that individuals from the West Australian breeding population strongly adhered to the classical feeding model. By contrast, East Australian population individuals demonstrated greater heterogeneity in their feeding. On a spectrum from exclusive Antarctic feeding to exclusive feeding in temperate waters, three different strategies were assigned and discussed: classical feeders, supplemental feeders, and temperate zone feeders. Diversity in the interannual feeding strategies of humpback whales demonstrates the feeding plasticity of the species, but could also be indicative of changing dynamics within the Antarctic sea-ice ecosystem. This study presents the first investigation of trophodynamics in Southern hemisphere humpback whales derived from baleen plates, and further provides the first estimates of baleen plate elongation rates in the species.

Item Details

Item Type:Refereed Article
Keywords:whales, krill, stable isotope
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
Author:Nicol, S (Dr Stephen Nicol)
ID Code:114394
Year Published:2016
Web of Science® Times Cited:4
Deposited By:Centre for Ecology and Biodiversity
Deposited On:2017-02-15
Last Modified:2017-03-21
Downloads:13 View Download Statistics

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