Abstract
The chironomid fauna of Baldwin Lake, an off-stream closed-cycle cooling reservoir for an 1800-megawatt coal-fired power plant, was sampled semi-monthly to monthly at four stations for six years, beginning five months after the reservoir was filled and ending 23 months after the third unit of the power plant went into operation. In the main basin three species dominated: Coelotanypus concinnus (Coquillett), Procladius bellus (Loew), and Tanypus stellatus Coquillett. The last did not become established until the lake was two years old, probably because temperatures were too low the first winter. Populations of all three species were initially large and sharply fluctuating, but later became smaller and less fluctuant in C. concinnus and P. bellus, due, probably, to more intense predation on them. Only in T. stellatus were changes in voltinism clearly evident: it changed from bivoltine to tri- and quatrivoltine as degree-days of heat increased. Photoperiod also affected its life cycle, as evidenced by synchronous development of summer generations each year. Temperature and perhaps food supply affected development time of its overwintering generation. All three species tolerated a temperature of 38 °C; their populations were kept low in the discharge channel by the current, not the temperature. Six species of Chironominae were sporadically abundant in the discharge channel.
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Stahl, J.B. A six-year study of abundance and voltinism of Chironomidae (Diptera) in an Illinois cooling reservoir. Hydrobiologia 134, 67–79 (1986). https://doi.org/10.1007/BF00008700
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DOI: https://doi.org/10.1007/BF00008700