著者

藤田 朝彦 大浜 秀規 細谷 和海

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.52, no.1, pp.21-26, 2005-05-25 (Released:2010-06-28)

参考文献数

19

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Phoxinus lagowskii yamamotis is a small dace-like cyprinid, endemic to Lakes Yamanaka and Motosu at the northern base of Mt. Fuji. The fish was categorized as Data Deficient (DD) in the Japanese Red Data Book (2nd edition). Morphological comparisons between the type series of “Moroco yamamotis” and syntypes of “P.steindachneri” revealed a distinction in caudal peduncle height, the former showing extreme values, lower than for other individuals from same river basin and adjacent rivers. Phoxinus lagowskii yamamotis may have been a lacustrine population from which an ancestoral population of P.lagowskii steindachneri evolved following adaptations to a lentic environment. Several specimens were collected from an outlet of L. Yamanaka. A relationship between these specimens and the lacustrine “M.yamamotis” group is suggested, the assemblage being in need of conservation as an evolutionarily significant unit.