所属 川崎医療福祉大学 医療福祉学部 臨床心理学科 職種 特任教授
|概要||Sasaki collected six species of freshwater sponges consisiting of five genera in Akita Prefecture in 1934 and 1939(personal communication). However, he did not try to collect freshwater sponges from Lake Hachiro at that time because the lake was a lagoon and contained sea water. From 1957, most of Lake Hachiro was reclaimed by drainage and by 1966 its water had changed throughly from brackish water to freshwater. After this change in water quality, only one freshwater sponge, Ephydatia fluviatilis (Linnaeus, 1758), from Lake Hachiro in Akita Prefecture had been reported by Toriumi(1976).
In the present report, eight species of freshwater sponges consisting of six genera from Lake Hachiro have been described, including the first reported occurence of Eunapius sinensis (Annandale, 1910) and Heterorotula multidentata (Weltner, 1895) in Akita Prefecture. The former species has been previously recorded at only three other locations in Japan. Therefore, to date, nine species consisting of six genera have been collected in Akita Prefecture.
Investigations such as this one will contribute to a clearer understanding of chage in the limnological environment.