Geographic Variation in Vertebral Numbers in Two Pholidid Fishes, Enedrias nebulosa and E.crassispina around Japan

概要

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The vertebral variation in Enedrias nebulosa and E.crassispina (Pholididae) is investigated from 38 sites around Japan.The mean value and range of vertebral numbers are plotted against the latitudes and the mean surface temperatures in December and February.The linear relationships between the vertebral numbers and latitude and tem-perature show that the vertebral number increases in relation to the higher-latitude and lower-temperature.According to ocean current systems and the response of results com-paring numbers to the above two factors and t-test between the mean vertebral numbers in samples from all neighbouring sites, populations may be sorted into two major groups, i.e., 1) the Sea of Japan and northern Pacific and 2) the southern Pacific, and a minor Inland Sea group.Vertebral numbers in the Inland Sea group are put between those of the two major groups in each species.The two major groups are considered to represent geographic dimorphism in Dictyosoma burgeri and Pterogobius elapoides.
日本魚類学会の論文