Newly identified chironomids at Fuji Five Lakes in the fall season

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  • 秋期,富士五湖沿岸域で新たに確認されたユスリカ成虫相について(英文)

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Abstract

his is the first report on chironomid communities captured by light traps at the Fuji Five Lakes in the fall season. A comparison of the chironomid communities was made among these lakes in relation to the eutrophic level. We identified a total of 33 species belonging to three subfamilies, i. e., 16 species of Orthocladiinae, 16 species of Chironominae and 1 species of Tanypodinae. We recorded a total of 24 newly recorded species around these lakes. In Lake Yamanaka, Tanytarsus takahasii, Stictochironomus sticticus and Tanytarsus yunosecundus were the dominant species, whereas ProPsilocerus akamusi was dominant in Lake Kawaguchi and Smittia insignis in Lake Motosu. 0nly Smittia aterrima was a common spedes in the Fuji Five Lakes. Shannon-Wiener diversity index (H') was highest at 2.63 in Lake Shoji and lowest at 0.99 in Lake Kawaguchi. 0ur results suggest remarkable differences in chironomid communities between rather oligotrophic lakes such as Lakes Motosu and Sai, and the more eutrophicated ones such as Lakes Shoji and Kawaguchi. Although Lake Yamanaka was classified as a mesotrophic lake in previous studies, this lake seems to be undergoing profirressive eutrophication.

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