Horizontal distribution of zooplankton community in the oxbow lake of the Krapina river

Meseljević, Matija (2010) Horizontal distribution of zooplankton community in the oxbow lake of the Krapina river. Diploma thesis, Faculty of Science > Department of Biology.

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Research in the oxbow lake of Krapina River was conducted from January untill June 2008 on two stations. One station was situated in the open-water zone (station PL) and the other in littoral zone (station PLL) with narrow belt of emergent macrophyte. Seasonal and spatial variations in the zooplankton community were examined on Rotifera, Cladocera and Copepoda. Research was conducted during winter period without emergent vegetation and spring period with emergent vegetation (simple habitus architecture) and predator pressure (fish). Main hypothesis in this study was that the water transparency and emergent macrophytes effect on zooplankton community composition in the open-water zone and littoral zone. Aims of this study were: 1. to establish abundance and diversity of zooplankton on both stations (PL and PLL); 2. to analyze spatial and seasonal variations in the zooplankton trophic structure on both station; 3. to analyze the effect of physico-chemical factors, nutrients and different food resources on zooplankton community composition. A total of 19 Rotifera taxa, 4 Cladocera and 4 Copepoda taxa were identified in the open-water zone, whereas total of 23 Rotifera taxa, 3 Cladocera and 4 Copepoda taxa were found in the littoral zone. On the both stations rotifers were the most abundant group (97 to 1638 ind/L on station PL, 23 to 5666 ind/L on station PLL) with the most dominant genera: Keratella and Polyarthra. Differences in physico-chemical factors between two stations were not significant (p>0,05), while this trophic groups had significant differences (p<0,05): Rotifera micro- and macrofilter-feedrs and Crustacea microfilter-feedrs. Greater number of zooplankton species in open-water zone is result of (i) less water transparency, which affected visual predators (fish); (ii) steep shore with narrow belt of emergent macrophytes which represent less diverse microhabits. The results of this study suggest that water transparency had the most influence on abiotic and biotic factors in oxbow lake near Krapina River and that the macrophyte belt isn't always place with greater number of zooplankton species. Beside those factors, temperature and food source had also effect on zooplankton community.

Item Type: Thesis (Diploma thesis)
Keywords: emerged vegetation, water transparency, zooplankton, fish predation
Supervisor: Špoljar, Maria
Date: 2010
Number of Pages: 48
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 05 Sep 2014 10:20
Last Modified: 18 Sep 2014 08:19
URI: http://digre.pmf.unizg.hr/id/eprint/2640

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