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キーワード:
Chironomidae; Diamesinae; life cycle; photoperiod
要旨:
The generation time of P. branickii was studied using larval samples in conjunction with rearing experiments and continuous collection of egg masses across one year. This species produced three generations per year in a central German stream (280 m a.s.l., 50° 40´N). Its generation time was variable and obviously influenced by the photoperiod to which eggs and larvulae were subjected. It is thus concluded that two 'strains' of P. branickii were present in a single population, one bivoltine and the other trivoltine.
