佐渡島およびその近海の端脚類相(予報)

概要

論文の詳細を見る
Amphipods chiefly consisting of the suborders Gammaridea and Caprellidea were collected in the adjacent waters of Sado Island and the coasts of Niigata (Fig. 1). In all 47 species and subspecies belonging to 19 families were identified at present (Table 1), although no remarkable or noteworthy species was detected in the taxonomic and biogeographic points of view. Among them, Caprella neglecta, C. scaura diceros, Amphithoe lacertosa, Hyale grandicornis, Jassa falcata and Orchestia platensis are the most common species occurring abundantly in shallow waters and sandy beaches. In the Ko-sado-type coasts with a comparatively calm sea throughout the year, the population of C. danilevskii is superior to that of C. neglecta, while C. neglecta is a dominant species in the Sotokaifu-type coasts which have many crags in a rough sea. C. kroyeri is a single species occurring in the Zostera belt of Mano Bay, and C. scaura subspp. are found dominantly in the brackish lake, Kamo-ko, which is polluted by the wastes of the city lives and oyster cultivation. It is of interest to see that the stomach contents of a file fish, Navodon modestus, caught by the set net, were occupied only by the amphipods consisting of a lot of C. neglecta, C. scaura subspp. and C. equilibra, and a few Hyale grandicornis. Anonyx nugax and Socarnes vahli are the rapacious scavengers for the immovable fishes that were caught in the gill net.
日本動物分類学会の論文