Dynamics of hydra populations in Lake Zürich, Switzerland, and Lake Maggiore, Italy

Autor:	C. Scascighini, P. Tardent, R. Tardent, G. Ribi
Rok vydání:	1985
Předmět:	Cnidaria Ciliate Ecology biology media_common.quotation_subject Hydra circumcincta Attenuata Aquatic Science biology.organism_classification Abundance (ecology) Lernaean Hydra Reproduction Coelenterata Ecology Evolution Behavior and Systematics Water Science and Technology media_common
Zdroj:	Swiss Journal of Hydrology. 47:45-56
ISSN:	1420-9055 0036-7842
DOI:	10.1007/bf02538183
Popis:	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.
Databáze:	OpenAIRE
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