Ref ID : 632
Suzanne Bosselmann; Population dynamics of Keratella cochlearis in Lake Esrom. Arch.Hydrobiol. 87(2):152-165, 1979
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The number of individuals and eggs of Keratella cochlearis (Gosse) in Lake Esrom was estimated from vertical samples series taken during 1973 and used for the calculation of the rates of birth, increase, and death. The birth rate was correlated to the temperature during the period of reproduction from March to December, but a stronger correlation was found between the parameters from March to May. During July and August the birth rate was negatively correlated to the transparency when a delay of about one week was taken into account. In the spring the birth rate was limited by the temperature. In mid summer food limited the production of eggs, while in late summer improved food conditions caused a second maximum of reproduction. It is concluded that the sampling intervals did not essentially exceed the generation time of K. cochlearis. Hatching of resting eggs in the spring was demonstrated.