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Role of kairomones in host location of the pennellid copepod parasite, Lernaeocera branchialis (L. 1767)

Published online by Cambridge University Press:  01 February 2013

A. J. BROOKER*
Affiliation:
Institute of Aquaculture, University of Stirling, Stirling FK9 4LA, UK
A. P. SHINN
Affiliation:
Institute of Aquaculture, University of Stirling, Stirling FK9 4LA, UK
S. SOUISSI
Affiliation:
Université Lille 1, Sciences et Technologies, UMR CNRS 8187 LOG, Station Marine, 28 Avenue Foch, F-62930 Wimereux, France
J. E. BRON
Affiliation:
Institute of Aquaculture, University of Stirling, Stirling FK9 4LA, UK
*
*Corresponding author:Institute of Aquaculture, University of Stirling, Stirling FK9 4LA, UK. Tel: +44 (0)1786 467876. Fax: +44 (0)1786 472133. E-mail: ajb3@stir.ac.uk

Summary

The life cycle of the parasitic copepod Lernaeocera branchialis involves 2 hosts, typically a pleuronectiform host upon which development of larvae and mating of adults occurs and a subsequent gadoid host, upon which the adult female feeds and reproduces. Both the copepodid and adult female stages must therefore locate and identify a suitable host to continue the life cycle. Several mechanisms are potentially involved in locating a host and ensuring its suitability for infection. These may include mechano-reception to detect host movement and chemo-reception to recognize host-associated chemical cues, or kairomones. The aim of this study was to identify the role of kairomones in host location by adult L. branchialis, by analysing their behaviour in response to fish-derived chemicals. Experiments demonstrated that water conditioned by immersion of whiting, Merlangius merlangus, elicited host-seeking behaviour in L. branchialis, whereas cod- (Gadus morhua) conditioned water did not. Lernaeocera branchialis are considered a genetically homogeneous population infecting a range of gadoids. However, their differential response to whiting- and cod-derived chemicals in this study suggests that either there are genetically determined subspecies of L. branchialis or there is some form of environmental pre-conditioning that allows the parasite to preferentially recognize the host species from which it originated.

Information

Type
Research Article
Copyright
Copyright © Cambridge University Press 2013

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