Kinsten, B. & P. Olsen. (1981). Impact of Mysis relicta Loven introduction on the plankton of two mountain lakes, Sweden. Reports of the Institute of Freshwater Research, Drottningholm. 59:64-74.

159322

Kinsten, B. & P. Olsen

1981

59:64-74.

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NeMys doc_id: 1508

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Mysis relicta. was introduced to two Swedish mountain lakes, Lake Mesvattnet and Lake Smavattnet in 1971. Dense Mysis populations were established in the two lakes about 1974—-75. The mean summer phytoplankton biomass increased considerably in both lakes during the course of development of the Mysis populations. This increase was especially attributed to algae belonging to the genera Cyanophyta, Chrysophyceae and Dinophyceae. In Lake Mesvattnet the composition of zooplankton changed rather drastically after the increase in density of the Mysis population. Both the cladocerans Eubosmina longispina and Holopedium gibberum became almost extinct, while the rotifers have increased considerably. In Lake Småvattnet increased numbers of rotifers and a tendency to decreasing numbers of Eubosminaand Holopedium were recorded. However, in this lake the dominating cladoceran was Daphnia longispina which on the whole has remained unaltered. The copepod Cyclops scutifer seemed to be unaltered in both lakes, although Mysis in a set of experiments was shown to be capable of feeding on them. The changed plankton situation in Lake Mesvattnet after the introduction of Mysis is likely an effect of heavy Mysis predation on cladocerans. The cause of the changed plankton situation in Lake Småvattnet is to some degree more obscure.

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