Synopsis
Two sympatric morphs of threespine stickleback Gasterosteus aculeatus are found in Lake Azabachije (Kamchatka, USSR); resident low-plated leiurus and completely plated trachurus, migrating from the Bering sea into the Lake to spawn. The absence of the intermediate morph semiarmatus and significant differences in a number of characters are indicative of reproductive isolation. The results show that the leiurus morph is common in the regions other than those with mild climate and small seasonal fluctuations of temperature.
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Ziuganov, V.V., Golovatjuk, G.J., Savvaitova, K.A. et al. Genetically isolated sympatric forms of threespine stickleback, Gasterosteus aculeatus, in Lake Azabachije (Kamchatka-peninsula, USSR). Environ Biol Fish 18, 241–247 (1987). https://doi.org/10.1007/BF00004877
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DOI: https://doi.org/10.1007/BF00004877