hays-doespreysize-2012.pdf (408.4 kB)
Does prey size matter? Novel observations of feeding in the leatherback turtle (Dermochelys coriacea) allow a test of predator–prey size relationships
journal contribution
posted on 2012-06-01, 00:00 authored by S Fossette, A Gleiss, J Casey, A Lewis, Graeme HaysGraeme HaysOptimal 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 lettersVolume
8Issue
3Pagination
351 - 354Publisher
Royal Society PublishingLocation
London, EnglandPublisher DOI
Link to full text
ISSN
1744-9561eISSN
1744-957XLanguage
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2012, Royal Society PublishingUsage metrics
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