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Peter Funch

Hidden diversity and host specificity in cycliophorans; a phylogeographic analysis along the North Atlantic and Mediterranean Sea

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  • Matthias Obst, Aarhus Universitet, Denmark
  • Peter Funch
  • Giribet Gonzalo, Harvard University, United States
  • Department of Biological Sciences, Genetics and Ecology
In order to elucidate the evolutionary history and the population structure of the membersof the phylum Cycliophora, which live commensally on three species of lobsters, we studiedsequence variation in the mitochondrial gene cyctochromecoxidase subunit I. Overall 242sequences from 16 locations on both coasts of the North Atlantic, including the North Seaand the Mediterranean, were analysed, revealing 28 haplotypes, with a maximum sequencedivergence of 16.6%. Total genetic diversity was high (h= 0.8322, ππ= 0.0898), as it was forthe commensals onHomarus americanus(17 haplotypes,h= 0.7506, ππ= 0.0504). However, itwas low for commensals onNephrops norvegicus(6 haplotypes,h= 0.3899, ππ= 0.0035), andintermediate for cycliophorans onHomarus gammarus(5 haplotypes,h= 0.3020, ππ= 0.0140).Although two of the host lobsters co-inhabit the coastal waters of Europe, a strong geneticstructure (78.45% of the observed genetic variation) was detected among populations on allhost species, indicating the existence of a reproductively isolated species on each lobster.In addition, genetic structure over long distances exists among populations on each hostspecies. Such patterns can be explained by the limited dispersal ability of the cycliophoranchordoid larva. Demographic and phylogenetic analyses suggest old and possibly crypticpopulations present onH. americanusandH. gammarus, while the latter may have experiencedrecent bottlenecks, perhaps during Pleistocene glaciations. Populations onN. norvegicusappear to be of recent origin.
Original languageEnglish
JournalMolecular Ecology
Volume14
Pages (from-to)4427-4440
Number of pages14
ISSN0962-1083
Publication statusPublished - 2005

    Research areas

  • Homarus, Nephrops, phylogeography, Pleistocene, Symbion americanus, Symbion pandora

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