Naslov
River discharge regime as a factor affecting the changes in community and functional feeding group composition of macroinvertebrates on a cobble substrate in Sava River

Autori
Habdija, Ivan ; Radanović, Ines ; Primc-Habdija, Biserka ; Matoničkin, Renata ; Kučinić, Mladen

Izvornik
Biologia, Section Zoology (1335-6380) 58 (2003), 2; 217-229

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

Ključne riječi
Benthic community; macroinvertebrate biomass; food availability; hydrological regime; particulate organic matter

Sažetak
On a cobble substrate in the lower rhithron section of the Sava River, according to discharge regime and water temperature, four different hydrological periods were distinguished: winter and summer hydrologically stable periods characterized by low discharge, and spring and autumn unstable periods characterized by higher discharge and some discharge peaks. Seasonal changes of food availability for the benthic community were significantly affected by discharge regime. A higher content of benthic particulate organic matter and a decrease of it in the seston was associated with the stable discharge regime. The seasonal variations of discharge associated with food availability were significantly reflected in macroinvertebrate biomass, species diversity, and community and functional feeding structure. Biomass of shredders, scrapers and collectors showed a significant relationship with their likely food sources. Significant relationships between predators and shredders and predators and collector-filterers were found, whereas predator relationships with scrapers and collector-gatherers were non-significant. On the cobble substrate at four sites, a total of 98 macroinvertebrate taxa were found. Oligochaetes, trichopterans and dipterans were the most abundant taxonomic groups, the biomass of which amounted (on average) to over 95 % of the total macroinvertebrates.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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