Genetic diversity and evolutionary relationships of the troglodytic ‘living fossil’ Congeria kusceri (Bivalvia: Dreissenidae)

Population genetic theory predicts that long‐term isolation of ‘living fossils’ in relic habitats might reduce genetic variability due to small population sizes and inbreeding. The recent description of a troglodytic ‘living fossil’ Congeria kusceri  — the only known subterranean bivalve mollusc — f...

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Vydáno v:Molecular ecology Ročník 10; číslo 8; s. 1873 - 1879
Hlavní autoři: Stepien, C. A., Morton, B., Dabrowska, K. A., Guarnera, R. A., Radja, T., Radja, B.
Médium: Journal Article
Jazyk:angličtina
Vydáno: England 01.08.2001
Témata:
Animals
Bivalvia
COI gene
Congeria kusceri
Corbicula fluminea
Croatia
DNA, Mitochondrial - genetics
DNA, Ribosomal - genetics
Dreissena
Dreissena bugensis
Dreissena polymorpha
Dreissenidae
Electron Transport Complex IV - genetics
Evolution, Molecular
Freshwater
Genetic Variation
Haplotypes
Mollusca - classification
Mollusca - genetics
Mollusca - physiology
Mytilopsis leucophaeta
Phylogeny
Croatia
ISSN:0962-1083, 1365-294X
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Popis
Shrnutí:Population genetic theory predicts that long‐term isolation of ‘living fossils’ in relic habitats might reduce genetic variability due to small population sizes and inbreeding. The recent description of a troglodytic ‘living fossil’ Congeria kusceri  — the only known subterranean bivalve mollusc — from a genus thought to be extinct since the Miocene, offers a unique opportunity to examine this hypothesis. Here, we use DNA sequences from two mitochondrial genes to compare levels of genetic variability and to test phylogenetic relationships of C. kusceri with surface‐dwelling dreissenid relatives. Phylogenetic analyses of sequences from the cytochrome oxidase 1 (COI) and 16S rDNA genes reveal that Mytilopsis is the sister genus to Congeria and this clade forms the sister taxon to Dreissena . Relatively high levels of DNA diversity characterized the population of C. kusceri (haplotypic diversity = 0.50 for 16S rDNA and 0.66 in the COI gene), in contrast to no intraspecific variability in populations of Dreissena polymorpha , D. bugensis , Mytilopsis leucophaeta , and Corbicula fluminea . Maintenance of genetic variability in C. kusceri may result from long‐term population size stability, which merits further investigation. This underground species apparently was buffered from the climatic changes and resultant population bottlenecks that affected its surface‐dwelling relatives during the Pliocene and Pleistocene Ice Ages.
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ISSN:0962-1083
1365-294X
DOI:10.1046/j.0962-1083.2001.01329.x