Naslov
Composition and depth distribution of oligochaete fauna of Mediterranean karstic lake (Lake Visovac, Croatia).

Autori
Mihaljević, Zlatko ; Kerovec, Mladen ; Ternjej, Ivančica ; Mrakovčić, Milorad

Izvornik
Biologia (0006-3088) 56 (2001), 5; 461-467

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Oligochaeta; depth distribution; karstic lake; Croatia

Sažetak
The depth distribution of oligochaetes was studied in Visovac lake (Croatia) along a transect from 1 to a maximum of 24 metres. In the material collected, 21 oligochaete species belonging to 4 families were identified, all of them more or less common in European lakes. The greatest diversity of oligochaetes was found at a depth of 4-6 m (18 taxa). On silty-sands covered by reed decay at a depth of 1 m oligochaetes comprised only 2% of the total benthic biomass. Oligochaeta densities increased with depth and at a depth of 22-24 m they represented 59% of the total biomass. Depth and bottom type were the impor- tant variables in defining species distribution. Only three oligochaete species were found at all of the investigated depths: Potaraothrix hammoniensis, Psarrsrrdoryct,ides 6ar6ntus and Lirnnodrilus hoffraeisteri. Aulodridus plvriseta was distributed only in the area of submerged macrophytes. The remaining species occurred less frequently, and mainly with restricted distribution.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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