新潟地方のウキゴリ : I. 佐渡島における3型の分布

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タイトル別名
  • 新潟地方のウキゴリー1-佐渡島における3型の分布
  • ニイガタ チホウ ノ ウキゴリ 1 サドガシマ ニ オケル 3ガタ ノ ブンプ

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説明

In our previous paper we have reported four color types of very common freshwater goby, Rhinogobius brunneus (TEMMINCK et SCHLEGEL), found in Sado Island on the Japan Sea (INOUYE, MATSUMOTO and HONMA, 1978). This Island lies 32 miles west of Niigata City. Chaenogobius annularis GILL, consisting both of brackish and freshwater dwellers, is also a common freshwater goby widely distributed throughout the Japanese Islands. Based chiefly on the color pattern and blotches on the dorsal and caudal fins as taxonomic characters, NAKANISHI (1978 a, b) reported that this goby can be classified into 3 different types : middle-reach-, freshwater-, and brackish water types. To make comparison with our previous paper and NAKANISHI'S papers, we have investigated the distribution, variability and intraspecific differentiation of this species occurring in Niigata area. The present paper deals with the results obtained in Sado Island. The material consists of 241 specimens collected from 33 locations of 28 rivers, from May to December, 1977. In the present time, the size, shape and darkness of a blotch existed on the caudal peduncle just anterior to the base of caudal fiin were considered as a new taxonomic character, and were verified as valid. So-called middle-reach type was a commonest race throughout the water systems of the Island, and its distributional pattern was similar to that of cobalt type of R. brunneus. The feshwater type was found exclusively in the Kuninaka Plain located in the central part of the Island, and its distributional pattern corresponded to that of orange type, i.e., lacustrine race, of R. brunneus. The brackish type showed a comparatively wide distribution and its distributional pattern was somewhat related to that of middle-reach type. Curiously, in 3 rivers this type was occupied the most upper reaches among these three types. The habitat of C. annularis tended to restrict in the comparatively lower region of the rivers in Sado Island. It was cleared that the habitat of cobalt type of R. brunneus existed in the most upper reaches of the rivers among the gobiid fishes of the Island.

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