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Genetic divergence between the sibling species of river-sculpin,Cottus amblystomopsis andC. nozawae, with special reference to speciation

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Polypatric speciation from an amphidromous ancestor has been suggested for a fluvial gobyRhinogobius flumineus; a similar history may explain life-history and genetic variation inCottus species. We used starch-gel electrophoresis to examine intra- and interspecific genetic differentiation of two siblingCottus species, amphidromousC. amblystomopsis and fluvialC. nozawae, which are presumed to be in an ancestor-descendant phyletic relationship. Genetic differentiation was markedly less withinC. amblystomopsis, than inC. nozawae. One group ofC. nozawae populations was closer toC. amblystomopsis (by Nei's genetic distance) than it was to other populations ofC. nozawae. This suggests that the differentiation of presently identifiable groups ofC. nozawae populations might have occurred polypatrically from an amphidromous ancestral population at different times. The two groups are presumed to be different species in spite of their quite similar morphological and ecological characteristics: we propose to call this type of speciation ‘Polypatric and parallel speciation’. This model of ‘Polypatric and parallel speciation’ might be generalized to explain evolution of amphidromous or anadromous species to fluvial or lacustrine land-locked species.

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  1. Department of Biology, Faculty of Fisheries, Hokkaido University, Hakodate, 041, Japan

    Akira Goto & Tadashi Andoh

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  1. Akira Goto
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  2. Tadashi Andoh
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Goto, A., Andoh, T. Genetic divergence between the sibling species of river-sculpin,Cottus amblystomopsis andC. nozawae, with special reference to speciation. Environ Biol Fish 28, 257–266 (1990). https://doi.org/10.1007/BF00751039

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