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Seasonal dynamics of the cestode fauna in spiny dogfish, Squalus acanthias (Squaliformes: Squalidae)

Published online by Cambridge University Press:  25 February 2014

MARIA PICKERING  and
JANINE N. CAIRA
MARIA PICKERING*
Affiliation:
Department of Ecology and Evolutionary Biology, University of Connecticut, 75 N. Eagleville Rd. Unit 3043, Storrs, Connecticut 06269-3043, USA
JANINE N. CAIRA
Affiliation:
Department of Ecology and Evolutionary Biology, University of Connecticut, 75 N. Eagleville Rd. Unit 3043, Storrs, Connecticut 06269-3043, USA
*
* Corresponding author. Department of Ecology and Evolutionary Biology, University of Connecticut, 75 N. Eagleville Road, Unit 3043, Storrs, CT 06269, USA. E-mail: [email protected]
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Summary

This study furthers understanding of cestode infections in a marine environment through time and space by following seasonal fluctuations in infection parameters of three cestode species (Gilquinia squali, Trilocularia gracilis and Phyllobothrium squali) parasitizing spiny dogfish (Squalus acanthias) in the northwest Atlantic and comparing them to work previously published from the northeast Atlantic on T. gracilis. For each cestode species, host size, season and presence of the other cestode species were analysed using generalized linear models to determine if they were good predictors of prevalence and intensity. Infection parameters differed across season for the three cestode species. However, within T. gracilis seasonal trends were found to be remarkably similar on both sides of the Atlantic, differing only in a somewhat delayed decline in prevalence in the northwest Atlantic. The differences seen in infection measures across cestode species likely reflect the unique life history strategies of different parasite species. While general trends appear to be maintained across disparate localities, variation seen is likely due to differences in accessibility to intermediate hosts and host diet across sites. The knowledge gained from understanding cestode infections in the vast ocean environment allows us to speculate about the factors driving fluctuations in parasite infections in elasmobranchs.

Keywords

seasonalitytapewormssharksSqualusTriloculariaGilquiniaPhyllobothriumIrish SeaRhode Island
Type
Research Article
Information
Parasitology , Volume 141 , Issue 7 , June 2014 , pp. 940 - 947
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Copyright
Copyright © Cambridge University Press 2014 

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