ヤミノニシキガイ 2 型の特徴 : 2. 軟体部の形態とその季節変動

概要

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To clarify taxonomic status of two forms (Awajichihiro and Yaminonishiki) of Hirase's scallop Volachlamys hirasei, internal characters and their seasonal changes were examined as the second report of series studies. No visual differentiations were detected in the internal organs between the two forms. Further, seasonal changes of weight index of each organ showed very similar patterns between the two forms. Gonadosomatic index (GSI) showed high values in spring to summer, and low values in autumn to winter. In contrast, condition factor (CF) changed with inverse pattern to the GSI, being low in spring to summer, while being high in autumn to winter. The other indices, such as adductor muscle, gill and mantle showed similar seasonal changes with the CF pattern. It was considered that the seasonal changes of these indices were influenced by their propagative cycles. The similarities in the internal characteristics and their seasonal changes between the two forms suggested that they are the same reproductive populations, however, further studies on the other biological features should be needed to give the conclusion on the taxonomic status of the two forms.
日本貝類学会の論文
1997-12-31