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Parasites of polychaetes and their impact on host survival in Otago Harbour, New Zealand

Published online by Cambridge University Press:  09 June 2011

R.C. Peoples
Affiliation:
Department of Zoology, University of Otago, PO Box 56, Dunedin, New Zealand
H.S. Randhawa
Affiliation:
Department of Zoology, University of Otago, PO Box 56, Dunedin, New Zealand
R. Poulin*
Affiliation:
Department of Zoology, University of Otago, PO Box 56, Dunedin, New Zealand
*
Correspondence should be addressed to: R. Poulin, Department of Zoology, University of OtagoPO Box 56, Dunedin, New Zealand email: robert.poulin@stonebow.otago.ac.nz

Abstract

Parasitism is increasingly recognized as an important determinant of population dynamics, productivity and community structure in intertidal ecosystems, and yet there is very little known about the effect of parasites on polychaetes, which represent a major component of the benthic fauna. We surveyed 11 polychaete species from a mudflat in Otago Harbour, New Zealand, and found that seven of these were infected by five parasite species: four trematodes and one apicomplexan gregarine. The gregarine found in Spirobranchus cariniferus and a strigeid trematode using Streblosoma toddae as its first intermediate host are both likely to have negative fitness impacts on their hosts. Other trematodes found were at the metacercarial stage and thus use polychaetes as second intermediate hosts. The most common, an opecoelid, infected the polychaetes Heteromastus filiformis and Abarenicola affinis at relatively high abundance. There was no indication of parasite-induced mortality in these two hosts based on the relationship between host size and infection intensity. However, a comparison of intact H. filiformis individuals with those that fragmented during collection revealed a significantly higher number of opecoelid metacercariae per segment in the fragments than in the complete individuals, suggesting that infection may compromise the structural integrity of the polychaetes. These results suggest that there exists a great diversity of both trematodes and host–trematode associations within the polychaete fauna, whose ecological impact remains to be quantified.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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