Abstract
Hydra populations were sampled every two weeks for three years in Lake Zurich and for one year in Lake Maggiore.Hydra fusca was most abundant followed byH. circumcincta andH. attenuata. The first two species showed strong seasonal fluctuations in abundance. Most of the reproduction occurred by budding. In all species, approximately one third of the individuals carried buds while the proportion of individuals carrying gametes was 1.6% inH. fusca and 13% inH. circumcincta in Lake Zurich. In Lake Maggiore very few sexual individuals were found. The ciliate commensalsKerona polyporum andTrichodina pediculus were observed on approximately one third of the individuals.
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