新潟市の開放型砂浜海岸浅海域におけるヨコエビ類 Ampelisca属の分布とその変動

概要

論文の詳細を見る
The present study was carried out to examine changes in distribution of Ampelisca, an infaunal tube dweller at Igarashi Beach in Niigata prefecture on the Japan Sea during April 1992 to December 1993. The dominant Ampelisca at Igarashi Beach were A. naikaiensis and A. brevicornis. A. naikaiensis was found to be distributed in waters below 8m in depth, while A. brevicornis was found in waters between 6-30m in depth during summer to early autumn, and was found below depth 10m in early spring and early winter. There was no remarkable relationship between distribution range in Ampelisca and environmental factors i.e. seasonal changes in water temperature, salinity, and particle size and ignition loss of bottom material. Changes in distribution are well explained through relations to the seasonal frequency of days with strong winds (>8m/s, WSW-NE) which cause waves over 1m height, known to change the bottom topography in waters shallower than 12m depth in the open coast near Igarashi Beach. In this study, Ampelisca was found only at the stations where changes in bottom topography by high waves is expected to be minimal. These facts suggest that changes in bottom topography by high waves might prevent Ampelisca from building living tubes in open coast like Igarashi Beach.
日本海洋学会の論文
1995-10-30