High activity and Levy searches : jellyfish can search the water column like fish

Hays, Graeme C., Bastian, Thomas, Doyle, Thomas K., Fossette, Sabrina, Gleiss, Adrian C., Gravenor, Michael B., Hobson, Victoria J., Humphries, Nicolas E., Lilley, Martin K.S., Pade, Nicolas G. and Sims, David W. 2012, High activity and Levy searches : jellyfish can search the water column like fish, Proceedings of the Royal Society B : biological sciences, vol. 279, no. 1728, pp. 279-1728, doi: 10.1098/rspb.2011.0978.

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Title High activity and Levy searches : jellyfish can search the water column like fish
Author(s) Hays, Graeme C.ORCID iD for Hays, Graeme C. orcid.org/0000-0002-3314-8189
Bastian, Thomas
Doyle, Thomas K.
Fossette, Sabrina
Gleiss, Adrian C.
Gravenor, Michael B.
Hobson, Victoria J.
Humphries, Nicolas E.
Lilley, Martin K.S.
Pade, Nicolas G.
Sims, David W.
Journal name Proceedings of the Royal Society B : biological sciences
Volume number 279
Issue number 1728
Start page 279
End page 1728
Total pages 1450
Publisher Royal Society Publishing
Place of publication London, England
Publication date 2012-02-07
ISSN 0962-8452
Keyword(s) plankton thin layers
Lasker’s stable ocean hypothesis
Summary Over-fishing may lead to a decrease in fish abundance and a proliferation of jellyfish. Active movements and prey search might be thought to provide a competitive advantage for fish, but here we use data-loggers to show that the frequently occurring coastal jellyfish (Rhizostoma octopus) does not simply passively drift to encounter prey. Jellyfish (327 days of data from 25 jellyfish with depth collected every 1 min) showed very dynamic vertical movements, with their integrated vertical movement averaging 619.2 m d−1, more than 60 times the water depth where they were tagged. The majority of movement patterns were best approximated by exponential models describing normal random walks. However, jellyfish also showed switching behaviour from exponential patterns to patterns best fitted by a truncated Lévy distribution with exponents (mean μ = 1.96, range 1.2–2.9) close to the theoretical optimum for searching for sparse prey (μopt ≈ 2.0). Complex movements in these ‘simple’ animals may help jellyfish to compete effectively with fish for plankton prey, which may enhance their ability to increase in dominance in perturbed ocean systems.
Language eng
DOI 10.1098/rspb.2011.0978
Field of Research 069999 Biological Sciences not elsewhere classified
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2012, Royal Society Publishing
Persistent URL http://hdl.handle.net/10536/DRO/DU:30058370

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