Abstract
We studied the exuviae of aquatic insects flowing down the stream at some stations of the two rivers, Yuragawa and Yoshinogawa.The exuviae of Ephemeroptera and Chironomidae showed a considerably high percentage.We found only a few exuviae of Trichoptera, although there lived a large number of larvae of this group in the stream. The reason may be : (1) The larval exuviae of Trichoptera seem to become to pieces easily. (2) Most species of Trichoptera live in their cases in which they cast their skins, so that they have less chances to be washed down in the water.Nevertheless, the stations of the stream, where many insects inhabit, we can find many flowing exuviae. Therefore, we can probably use the quantities of flowing exuviae as rough indicators of the productivity of aquatic insects in the stream.
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Schedule a callMore From: Japanese Journal of Limnology (Rikusuigaku Zasshi)
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