Abstract
In the present study, we used mitochondrial cytochrome oxidase subunit I (COI) and nuclear D2 region of 28S rDNA sequence data to examine the taxonomic status of the water mite species Hygrobates nigromaculatus from two types of freshwater habitats: lentic (lakes) and lotic (streams). Previous hypotheses about (sub)species status of populations inhabiting lakes and streams based on differences in morphometric data and life-cycle strategy (parasitic vs. non-parasitic larvae) were strongly supported by molecular data. Levels of COI and D2 28S rDNA differentiation between lake and stream populations were much higher (ca. 18 and 7.5%, respectively) than those typically observed for populations of a single species. Both lake and stream populations showed similar high levels of gene diversity (Hd = 0.894 and 0.836, respectively). However, nucleotide within-population polymorphism was more than twice as high in lake populations as that in stream populations (π = 1.33 and 0.60%, respectively). We hypothesize that the ancestral lake-dwelling population originated from a stream form with parasitic larvae (here: H. setosus nov. stat.). For the observed populations, H. nigromaculatus individuals could be separated from H. setosus by distinct morphometric characters. The loss of phoretic parasitic larvae greatly decreased dispersal ability of lake-dwelling mites and consequently also the gene flow between lake populations. Thus, relatively more differentiated genetic structure in lake populations probably results from a stronger isolation between particular lake habitats, but this hypothesis needs further extensive studies.
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Acknowledgments
The authors thank Dr. Reinhard Gerecke, Tübingen, Germany, for checking some doubtful specimens for their species identity. Thanks also to the late Dr. Cornelis Davids (1931–2004), Amsterdam, The Netherlands, for his interest in the topic and the loan of specimens from The Netherlands. Dr. Heather C. Proctor, Edmonton, Canada, gave us valuable comments on a former version of this paper. Parts of the study were financially supported by bilateral partnership contract of the Christian-Albrechts-Universität zu Kiel (Germany) and Adam Mickiewicz University in Poznan (Poland).
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Martin, P., Dabert, M. & Dabert, J. Molecular evidence for species separation in the water mite Hygrobates nigromaculatus Lebert, 1879 (Acari, Hydrachnidia): evolutionary consequences of the loss of larval parasitism. Aquat. Sci. 72, 347–360 (2010). https://doi.org/10.1007/s00027-010-0135-x
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DOI: https://doi.org/10.1007/s00027-010-0135-x