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Does prey size matter? Novel observations of feeding in the leatherback turtle (Dermochelys coriacea) allow a test of predator–prey size relationships

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journal contribution
posted on 2012-06-01, 00:00 authored by S Fossette, A Gleiss, J Casey, A Lewis, Graeme HaysGraeme Hays
Optimal foraging models predict that large predators should concentrate on large prey in order to maximize their net gain of energy intake. Here, we show that the largest species of sea turtle, Dermochelys coriacea, does not strictly adhere to this general pattern. Field observations combined with a theoretical model suggest that a 300 kg leatherback turtle would meet its energetic requirements by feeding for 3–4 h a day on 4 g jellyfish, but only if prey were aggregated in high-density patches. Therefore, prey abundance rather than prey size may, in some cases, be the overriding parameter for foraging leatherbacks. This is a classic example where the presence of small prey in the diet of a large marine predator may reflect profitable foraging decisions if the relatively low energy intake per small individual prey is offset by high encounter rates and minimal capture and handling costs. This study provides, to our knowledge, the first quantitative estimates of intake rate for this species.

History

Journal

Biology letters

Volume

8

Pagination

351 - 354

Location

London, England

Open access

  • Yes

ISSN

1744-9561

eISSN

1744-957X

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2012, Royal Society Publishing