Host size constrains growth patterns in both female and male Ceratothoa italica, a mouth-dwelling isopod
Rebecca J. Pawluk A B , Marco Ciampoli B C and Stefano Mariani B DA Department of Biosciences, Swansea University, Singleton Park, Swansea, SA2 8PP, UK.
B School of Environment and Life Sciences, University of Salford, Salford, M5 4WT, UK.
C Department of Biology and Biotechnology, University of Rome ‘La Sapienza’, Rome, I-00185 Italy.
D Corresponding author. Email: s.mariani@salford.ac.uk
Marine and Freshwater Research 66(4) 381-384 https://doi.org/10.1071/MF14125
Submitted: 3 October 2013 Accepted: 4 August 2014 Published: 9 December 2014
Abstract
Host–parasite associations are among the primary drivers of evolutionary diversification, and hold considerable importance for understanding ecological equilibria. In particular, crustacean ectoparasites are typically associated with many fish families, and may, under certain conditions, pose threats to fisheries and aquaculture. Cymothoid isopods include blood-feeding genera that inhabit the mouth of their host, and whose variation in life-history strategies remains largely unexplored. Here we investigate the size relationship between the highly prevalent Ceratothoa italica and its main natural host, the striped sea bream, Lithognathus mormyrus. We found significant correlation between host size and that of both female and male parasites. Although the generality of a host–female size association in mouth-dwelling cymothoids had been widely recognised for some time, here we provide the first robust support for the occurrence of this size association also in mouth-dwelling male parasites. The potential underlying biological causes of the patterns are discussed, contributing to the debate on the evolution of host–parasite interactions, and the adaptive radiation of this family of parasitic isopods.
Additional keywords: marine fish, parasites, reproductive success, sex-change, Sparidae.
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