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Diseases of Aquatic Organisms

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DAO 136:105-119 (2019)  -  DOI:

Acanthocephalan infection patterns in amphipods: a reappraisal in the light of recently discovered host cryptic diversity

Matthias Galipaud1,3, Loïc Bollache1,2, Clément Lagrue1,4,*

1Laboratoire Biogéosciences, UMR CNRS 6282 , Université Bourgogne Franche-Comté, 21000 Dijon, France
2Laboratoire Chrono-environnement, UMR CNRS 6249, Université Bourgogne Franche-Comté, 25000 Besançon, France
3Present address: Department of Evolutionary Biology and Environmental Studies, University of Zürich, 8057 Zurich, Switzerland
4Present address: Department of Biological Sciences, University of Alberta, Edmonton T6G 2E9, Alberta, Canada
*Corresponding author:
Advance View was available online June 20, 2019

ABSTRACT: Amphipods are model species in studies of pervasive biological patterns such as sexual selection, size assortative pairing and parasite infection patterns. Cryptic diversity (i.e. morphologically identical but genetically divergent lineages) has recently been detected in several species. Potential effects of such hidden diversity on biological patterns remain unclear, but potentially significant, and beg the question of whether we have missed part of the picture by involuntarily overlooking the occurrence and effects of cryptic diversity on biological patterns documented by previous studies. Here we tested for potential effects of cryptic diversity on parasite infection patterns in amphipod populations and discuss the implications of our results in the context of previously documented host-parasite infection patterns, especially amphipod-acanthocephalan associations. We assessed infection levels (prevalence and abundance) of 3 acanthocephalan species (Pomphorhynchus laevis, P. tereticollis and Polymorphus minutus) among cryptic lineages of the Gammarus pulex/G. fossarum species complex and G. roeseli from sampling sites where they occur in sympatry. We also evaluated potential differences in parasite-induced mortality among host molecular operational taxonomic units (MOTUs)-parasite species combinations. Acanthocephalan prevalence, abundance and parasite-induced mortality varied widely among cryptic MOTUs and parasite species; infection patterns were more variable among MOTUs than sampling sites. Overall, cryptic diversity in amphipods strongly influenced apparent infection levels and parasite-induced mortality. Future research on species with cryptic diversity should account for potential effects on documented biological patterns. Results from previous studies may also need to be reassessed in light of cryptic diversity and its pervasive effects.

KEY WORDS: Cryptic diversity · Infection patterns · Parasite-induced mortality · Pomphorhynchus laevis · Pomphorhynchus tereticollis · Polymorphus minutus · Gammarus pulex/Gammarus fossarum complex · Gammarus roeseli

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Cite this article as: Galipaud M, Bollache L, Lagrue C (2019) Acanthocephalan infection patterns in amphipods: a reappraisal in the light of recently discovered host cryptic diversity. Dis Aquat Org 136:105-119.

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