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Why do marine endotherms eat gelatinous prey?

Thiebot, J-B and McInnes, JC ORCID: 0000-0001-8902-5199 2019 , 'Why do marine endotherms eat gelatinous prey?' , ICES Journal of Marine Science, vol. 77, no. 1 , pp. 58-71 , doi: 10.1093/icesjms/fsz208.

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Abstract

There is growing evidence that gelatinous zooplanktonic organisms (“gelata”) are regular prey for marine endotherms. Yet the consumption of gelata is intriguing in terms of the energy reward, because endotherms have a high energy demand and the consumption of gelata provides little energy return. In this paper, we take advantage of recent advances in diet analysis methods, notably animal-borne video loggers and DNA analysis in seabirds, to examine our current understanding of this interaction. We suggest that several hypotheses commonly raised to explain predation on gelata (including increased biomass, reduced prey availability, and secondary ingestion) have already been tested and many lack strong support. We emphasize that gelata are widely consumed by endotherms (121 cases reported across 82 species of seabirds, marine mammals, and endothermic fishes) from the Arctic to the Antarctic but noticeably less in the tropics. We propose that in line with research from terrestrial ecosystems atypical food items might be beneficial to the consumers in a non-energetic context, encompassing self-medication, and responding to homeostatic challenges. Changing the “last resort” context for a “functional response” framework may improve our understanding of widespread predation on gelata. Further biochemical analyses are needed to formally examine this perspective.

Item Type: Article
Authors/Creators:Thiebot, J-B and McInnes, JC
Keywords: seabird, jellyfish, ctenophores, diet, DNA analysis, endotherm, gelatinous zooplankton, jellyfish, predation, predator–prey, salps, video data logger
Journal or Publication Title: ICES Journal of Marine Science
Publisher: Academic Press Ltd Elsevier Science Ltd
ISSN: 1054-3139
DOI / ID Number: 10.1093/icesjms/fsz208
Copyright Information:

Copyright 2019 International Council for the Exploration of the Sea

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