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Impact of Environmental Variables and Food Availability on Rotifer Assemblage in the Karstic Barrage Lake Visovac (Krka River, Croatia)
Author(s) -
Špoljar Maria,
Habdija Ivan,
PrimcHabdija Biserka,
Sipos Laszlo
Publication year - 2005
Publication title -
international review of hydrobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 1434-2944
DOI - 10.1002/iroh.200510791
Subject(s) - rotifer , mediterranean climate , abundance (ecology) , ecology , environmental science , relative species abundance , biology
Abstract We evaluated the impact of 18 environmental variables (physico‐chemical, nutrients, food resources) on rotifer assemblage in the sub‐Mediterranean karstic barrage Lake Visovac. In terms of the space‐time distribution the highest density of rotifers was noted in the summer period (average 386 ind/l, relative annual abundance 62%), and in the epilimnetic layer (average 309 ind/l, relative annual abundance 58%). A total of 41 rotifer taxa belonging to 22 genera and 14 families were identified. Three rotifer species: Gastropus stylifer , Synchaeta tremula and Trichocerca birostris were dominant and perennial during the annual investigation. Pearson's product‐moment correlations and canonical correlation analysis suggest that temperature, pH values, alkalinity, chemical oxygen demand and chlorophyll a concentration significantly influenced rotifer density. According to rotifer food collection and selection, in Visovac Lake macrofilter‐feeders predominated, and microfilter‐feeders were in a minority. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)