Abstract
The level of reproductive isolation and reproductive characteristics were examined in sympatric populations of the northern and southern forms ofLethenteron reissneri, in the Ushiwatari Stream, a tributary of the Gakko River, Yamagata Prefecture, Japan, to elucidate the reproductive isolating mechanisms existing between them. Extensive allozyme data showed no gene exchange between the two forms in the study area, evidence of their strict reproductive isolation from each other. The spawning seasons overlapped between the northern and southern forms, the spawning period of the latter being slightly later than that of the former. The size at maturity also overlapped between the two forms, although the southern form indicated significantly larger in average size than the northern one. These results suggested that neither seasonal reproductive isolation nor size assortative mating occurred. On the other hand, the nesting assemblages were observed to comprise only males and females of each respective form, suggesting that a recognition system restricted to each form may operate as a premating isolating mechanism.
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Yamazaki, Y., Goto, A. Breeding season and nesting assemblages in two forms oflethenteron reissneri, with reference to reproductive isolating mechanisms. Ichthyological Research 47, 271–276 (2000). https://doi.org/10.1007/BF02674250
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DOI: https://doi.org/10.1007/BF02674250