Abstract
The eclosion diel periodicity of chironomids in 3 different habitats in Florida was investigated on 3 or 4 occasions in 1979. On each occasion, samples of adult midges were collected at 2-h intervals over a 24-h period by employing submerged emergence traps. The diel changes in air and water temperatures and the dissolved oxygen in each habitat were measured. The time of sunset and sunrise was recorded. Diel periodicity of emergence was exhibited by Glyptotendipes paripes Edwards, Chironomus decorus Johannsen, C. crassicaudatus Malloch, Goeldichironomus holoprasinus (Goeldi), Tanytarsus spp., and the tanypodines (mostly Procladius sublettei Roback). The adult emergence of these species was principally nocturnal occurring mostly within 4 h after sunset. The tanypodines emerged again during dawn. No significant ( P >0.05) correlation (r=<0.3) was observed between the diel eclosion periodicity of the species studied and the water temperature or the dissolved oxygen in any habitat. Their emergence is related to the diel light changes.
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