Henrikson, L., H.G. Oscarson & J.A.E. Stenson. (1984). Development of the crustacean zooplankton community after lime treatment of the fishless Lake Gårdsjön, Sweden. Reports of the Institute of Freshwater Research, Drottningholm. 61:104-114, figs. 1-3, tabs. 1-6.

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Henrikson, L., H.G. Oscarson & J.A.E. Stenson

1984

61:104-114, figs. 1-3, tabs. 1-6.

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The crustacean zooplankton were studied in Lake Gårdsjön (and a control lake) two years before and two years after lime treatment. The lakes were devoid of fish throughout the study. No negative immediate shock effects were noted. No establishment of “new” species occurred, probably as a consequence of invertebrate predation, which was not structurally changed. Despite an increase in phytoplankton biomass and production no increases in total crustacean abundance was noted. Important zooplankton predators, like Chaoborus spp and Glaenocorisa propinqua, increased significantly and probably reduced the population of Bosmina coregoni, which in turn made it possible for Diaphanosoma brachyurum to increase its population size. The annual variation in the mean length of Bosmina was different from that in lakes with fish populations and it was not changed after liming. On the whole the structure of the crustacean community was similar to that before liming. The development after liming of a lake devoid of fish will be different from that of a lake with a sparse non-reproducing fish population before liming. In the latter lake the renewed success of fish reproduction will give a large fish fry population which will increase the predation on zooplankton as fish fry are potent zooplankton predators. Hence, changes in the crustacean zooplankton after liming are dependent on the acidification phase, i.e. the community structure of both prey and predators before liming.

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