Impact of Environmental Variables and Food Availability on Rotifer Assemblage in the Karstic Barrage Lake Visovac (Krka River, Croatia)
✍ Scribed by Maria Špoljar; Ivan Habdija; Biserka Primc-Habdija; Laszlo Sipos
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 289 KB
- Volume
- 90
- Category
- Article
- ISSN
- 1434-2944
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✦ Synopsis
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)