Long term changes in the Lake Myvatn ecosystem

A. Gardarsson, G. M. Gislason, A. Einarsson

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

In shallow eutrophic Lake Myvatn, Iceland, variation in the abundance of algae, crustaceans and chironomids in 2300 yr was studied in sediment cores. Densities of the benthic alga Cladophora aegagropila and associated invertebrates (Psectrocladius barbimanus, Eurycercus lamellatus) increased with decreasing depth of the water. The benthic Tanytarsus gracilentus and the planktonic Daphnia longispina showed a downward trend. On a shorter time scale, population changes, as documented by harvest records (ducks, fish) and monitoring studies (ducks, aquatic insects), are considerable and are often associated with food resources. High population levels of profundal chironomids and low population levels of littoral chironomids and the riverine Simulium vittatum coincided with low primary production in the plankton. High population levels of littoral midges and S. vittatum and low population levels of profundal chironomids were associated with high primary production in the plankton. -from Authors

Original languageEnglish
Pages (from-to)125-135
Number of pages11
JournalAqua Fennica
Volume18
Issue number2
Publication statusPublished - 1988

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