Co-phylogeographic study of the flatworm Gyrodactylus gondae and its goby host Pomatoschistus minutus

摘要: Abstract We performed a comparative phylogeographic study on the monogenean flatworm Gyrodactylus gondae Huyse, Malmberg & Volckaert 2005 (Gyrodactylidae) and its sand goby host Pomatoschistus minutus (Pallas, 1770) (Gobiidae). G. is host-specific parasite with direct life cycle very short generation time. These properties are expected to increase chance track genealogical history of genetic data (‘magnifying glass principle’). To investigate this hypothesis we screened nine populations (n = 326) along Atlantic coasts Europe for specimens. Low prevalence resulted in partially overlapping datasets. Ninety-two collected five were subsequently sequenced 460 bp cytochrome c oxidase subunit II (coxII) fragment, which, combination previously published haplotype hosts, allowed Haplotype diversity was lowest Irish Sea while nucleotide highest Southern North Sea. The population also showed but diversity, based b sequences 850 bp, found Skagerrak. Phylogeographic networks suggest postglacial expansion both parasite. Pair-wise differentiation however not consistently higher than host, rejecting magnifying host-parasite system. network offered limited resolution characterized by many extinctions and/or missing haplotypes, which could be attributed 1) sampling bias, 2) size fluctuations resulting frequent drift 3) relatively young age association. A more exhaustive including broader geographical genomic coverage needed discriminate among these competing hypotheses.