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Parasite biodiversity and its determinants in coastal marine teleost fishes of Brazil

Published online by Cambridge University Press:  13 May 2004

J. L. LUQUE ,
D. MOUILLOT  and
R. POULIN
J. L. LUQUE
Affiliation:
Departamento de Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro, Caixa Postal 74.508, CEP 23851-970, Seropédica, RJ, Brazil
D. MOUILLOT
Affiliation:
UMR CNRS-UMII 5119 Ecosystèmes Lagunaires, Université Montpellier II, CC 093, 34095 Montpellier cedex 5, France
R. POULIN
Affiliation:
Department of Zoology, University of Otago, P.O. Box 56, Dunedin, New Zealand
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Abstract

Recent studies of the forces behind the diversification of parasite assemblages have shed light on many aspects of parasite biodiversity. By using only parasite species richness as their measure of diversity, however, previous investigations have ignored the relatedness among parasite species and the taxonomic structure of the assemblages, which contain much information about their evolutionary origins. Here, we performed a comparative analysis across 50 species of fish from the coast of Brazil; we evaluated the effects of several host traits (body size, social behaviour, feeding habits, preference for benthic vs. pelagic habitats, depth range, and ability to enter brackish waters) on the diversity of their assemblages of metazoan parasites. As measures of diversity, we used parasite species richness, as well as the average taxonomic distinctness of the assemblage and its variance; the latter measures are based on the average taxonomic distance between any two parasite species in an assemblage. Unlike parasite species richness, taxonomic distinctness was unaffected by the number of host individuals examined per species. Fish body length proved to be the main predictor of parasite species richness, even when controlling for the confounding influences of host phylogeny and sampling effort, although it did not correlate with measures of parasite taxonomic distinctness. Predatory fish also had higher parasite species richness than planktivores, but this trend could not be confirmed using phylogenetically independent contrasts between host taxa. The main host feature associated with the taxonomic diversity of parasites was schooling behaviour, with schooling fish having more taxonomically diverse parasite assemblages than those of their non-schooling relatives. When focusing on endoparasite species only, both predatory feeding habits and a broad depth range were associated with the taxonomic distinctness of parasites. Our results suggest that certain host traits (i.e. body size) determine how many parasite species a host can accumulate over evolutionary time, whereas different host features influence the processes causing the taxonomic diversification of parasite assemblages.

Keywords

comparative analysishost phylogenytaxonomic distinctness
Type
Research Article
Information
Parasitology , Volume 128 , Issue 6 , June 2004 , pp. 671 - 682
Copyright
2004 Cambridge University Press

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