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Genetic and environmental determinants of host use in the trematode Maritrema novaezealandensis (Microphallidae)

Published online by Cambridge University Press:  21 July 2010

ANSON V. KOEHLER ,
ANNA G. GONCHAR  and
ROBERT POULIN
ANSON V. KOEHLER*
Affiliation:
Department of Zoology, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
ANNA G. GONCHAR
Affiliation:
Department of Zoology, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
ROBERT POULIN
Affiliation:
Department of Zoology, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
*
*Corresponding author: Tel: +64 03 479 5848. Fax: +64 03 479 7584. E-mail: ansonkoehler@gmail.com
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Summary

Factors constraining host specificity are poorly understood. Intraspecific variation in host preferences in generalist parasites may reveal which factors affect patterns of host use, and thus the evolution of specialization. Here, laboratory experiments examined genetic variation in host preferences and the effect of a refugium against infection on host use. Firstly, 6 cercarial clones of the trematode Maritrema novaezealandensis (ranging widely in heterozygosities) were exposed simultaneously to 2 alternative hosts, the amphipods Heterophoxus stephenseni and Paracalliope novizealandiae, to assess host preferences and fitness correlations with parasite heterozygosity. All clones showed a distinct preference for H. stephenseni, though the extent of this preference varied among clones. No clear association was found between heterozygosity and either parasite infection success or preference for a particular host. Secondly, cercariae were exposed to the same 2 amphipods in both the presence and absence of sand (refugium for H. stephenseni). Without sand, infection levels were significantly higher in H. stephenseni than in P. novizealandiae. With sand, H. stephenseni was able to hide, offsetting the parasite's intrinsic preferences for this host. These results demonstrate the existence of genetic variation in host preferences, as well as the effect of environmental variables on observed patterns of host use.

Keywords

host specificitygenetic variationheterozygosity fitness correlationamphipodtrematodeMaritrema novaezealandensisHeterophoxus stephenseniParacalliope novizealandiae
Type
Research Article
Information
Parasitology , Volume 138 , Issue 1 , January 2011 , pp. 100 - 106
Copyright
Copyright © Cambridge University Press 2010

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