東京都内におけるユスリカの生態 III. : 善福寺川に生息する2種のユスリカ幼虫の酸素欠乏に対する耐性

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OHNO, Masahiko (Tokyo Metr. Res. Lab. Pbl. Hlth., Tokyo). 1985. Ecological studies on chironomids in Tokyo. III. Tolerance of two species of chironomid larvae collected from the Zempukuji River to oxygen deficiency. Jap. J. Ecol., 35 : 103-111. Tolerance to low dissolved oxygen contents was examined in two species of chironomid larvae collected from different regions of the Zempukuji River. Chironomus yoshimatsui, which was dominant in the upper region (characterized by weak water flow and severe oxygen deficiency at night), was tolerant of low oxygen content. On the other hand, Cricotopus bicinctus, which was generally dominant in the lower region (characterized by faster water flow and less severe oxygen deficiency), was sensitive to the low content of oxygen. Rarity of Cr. bicinctus in the upper region may be explained by its sensitivity to the low oxygen content. Oxygen consumption of the chironomid larvae was measured at various concentrations of dissolved oxygen in water. It seemed that hyperbolic relations existed between the oxygen consumption rates of the chironomids and the oxygen concentrations. Reduction of oxygen consumption rates accompanied by lowering of oxygen concentration was not significantly different between the two chironomids per individual weight, but the more tolerant Ch. yoshimatsui showed less reduction per unit body weight.
1985-03-30