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Schlagwörter:
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Zusammenfassung:
Baetis vernus, a major contributor to the biomass of the Breitenbach, shows a remarkable degree of fluctuation in its emergence, which - in the years under observation (1969-1975) - ranges from univoltine to trimodal patterns. It is postulated, that warm overwintering temperatures produce unimodal emergence whereas cold winter temperatures (esp. periods with less than 5°C) produce biomodal or trimodal emergence. The relations between egg-hatching, larval growth and temperature are discussed.
