Covariance in species diversity and facilitation among non-interactive parasite taxa: All against the host

B. R. Krasnov, D. Mouillot, I. S. Khokhlova, G. I. Shenbrot, R. Poulin

    Research output: Contribution to journalArticlepeer-review

    30 Scopus citations

    Abstract

    Different parasite taxa exploit different host resources and are often unlikely to interact directly. It is unclear, however, whether the diversity of any given parasite taxon is indirectly influenced by that of other parasite taxa on the same host. Some components of host immune defences may operate simultaneously against all kinds of parasites, whereas investment by the host in specific defences against one type of parasite may come at the expense of defence against other parasites. We investigated the relationships between the species diversity of 4 higher taxa of ectoparasites (fleas, sucking lice, mesostigmatid mites, and ixodid ticks), and between the species richness of ectoparasites and endoparasitic helminths, across different species of rodent hosts. Our analyses used 2 measures of species diversity, species richness and taxonomic distinctness, and controlled for the potentially confounding effects of sampling effort and phylogenetic relationships among host species. We found positive pairwise correlations between the species richness of fleas, mites and ticks; however, there was no association between species richness of any of these 3 groups and that of lice. We also found a strong positive relationship between the taxonomic distinctness of ecto- and endoparasite assemblages across host species. These results suggest the existence of a process of apparent facilitation among unrelated taxa in the organization of parasite communities. We propose explanations based on host immune responses, involving acquired cross-resistance to infection and interspecific variation in immunocompetence among hosts, to account for these patterns.

    Original languageEnglish
    Pages (from-to)557-568
    Number of pages12
    JournalParasitology
    Volume131
    Issue number4
    DOIs
    StatePublished - 1 Oct 2005

    Keywords

    • Ectoparasites
    • Endoparasites
    • Rodents
    • Species diversity
    • Taxonomic distinctness

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