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JPR Advance Access published online on January 27, 2008
Journal of Plankton Research, doi:10.1093/plankt/fbn003
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© The Author 2008. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Diving behaviour of jellyfish equipped with electronic tags

Graeme C. Hays1,*, Thomas K. Doyle2, Jonathan D.R. Houghton1, Martin K.S. Lilley1, Julian D. Metcalfe3 and David Righton3

1 Biological Sciences, Institute of Environmental Sustainability, Swansea University, Swansea SA2 8PP, UK 2 Coastal & Marine Resources Centre, University College Cork, Glucksman Marine Facility, Naval Base, Haulbowline, Cobh, Cork, Ireland 3 Centre For Environment, Fisheries And Aquaculture Science, Lowestoft Laboratory, Pakefield Road, Lowestoft, NR33 0HT, UK

* Corresponding author: g.hays{at}swan.ac.uk

Received on November 30, 2007; revised on January 7, 2008; accepted on January 7, 2008


  Abstract

Jellyfish are one of the most abundant and conspicuous members of our coastal marine fauna and are now known to play major trophic roles in marine systems. However, little is known about the movements and behaviour of individuals. We equipped individual compass jellyfish (Chrysaora hysoscella) (n=15) off the Dingle coast, Ireland, with miniature time-depth recorders to log their depth over periods of a few hours. Vertical movements were extensive, with all jellyfish changing their depth during tracking. A range of vertical movements were seen including initial diving from the surface down to a maximum of 29.6 m after device attachment, some jellyfish remaining near the bottom, some moving up and down in mid-water and some moving back near the surface. These results show that jellyfish actively reposition themselves in the water column over small time-scales and open the way for more extensive studies equipping jellyfish with electronic tags.

Communicating Editor: Dr Roger Harris


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