engleski

Vertical distribution of Chironomidae larvae in the karstic travertine barrage Lake Visovac (Croatia)

From April 1995 to October 1996 the benthic community of the karsl Lake Visovac was studied with special reference to chironomids. By origi Lake Visovac is a travertine barrage lake and relates to solution lake Samples were taken along a transect from 1 to a maximum of 24 mete~ Over the entire investigated period, 29 Chironomidae species we recorded. Five subfamilies of Chironomidae were represente Chironominae (20 species), Tanypodinae (4 species), Orthocladiinae ~ species), Diamesinae (1 species) and Prodiamesinae (1 species). Tl chironomid community of shallower waters is generally much richer tha that of bare mud (the profundal zone). Tanytarsini were the most numero~ in the littoral zone, while in sublitoral and profundal zones Chironomi: were most abundant. Depth and bottom type were the important variables : defining species distribution. Chironomus gr. plumosus preferred most deep waters, while Paratanytarsus lauterborni and species of the gem Tanytarsus favoured shallower waters with a bottom rich in decaying pla~ fragments. Procladius choreus was found in relatively high abundance at a sampling depths due to its ability to feed on a wide range of food items.

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