Trophic structure of zooplankton community in the oxbow lake of Krapina river

Grčić, Zlatko (2010) Trophic structure of zooplankton community in the oxbow lake of Krapina river. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

Research in the oxbow lake of Krapina river was provided from January untill June 2008 on two study sites, marked as P (in the open-water zone) and L (in littoral zone). Spatial and temporal variations in the trophic structure of zooplankton community were examined on Rotifera, Cladocera and Copepoda. Research was conducted during winter period without emergent vegetation and spring period with emergent vegetation. Main hypothesis in this study was that water transparency and morphometrical characteristics of littoral zone and diversity of macrophytes effect trophic structure of zooplankton community in shallow eutrophic lakes. Aims of this study were 1. to analyse an establish effect of food resources and nutrients on abundance and biomass of trophic structure of zooplankton community; 2. to establish effect of water transparency and fish predation on body size groups of zooplankton in littoral zone and i open-water zone; 3. to analyse physico-chemical factors on trophic structure of zooplankton community in open-water zone and littoral zone. Higher species richness was recorded in littoral zone (station P 25, station L 36), but lower abundance (average: P 650±383 jed/L, L 354±169 jed/L), and biomass dry weight (P 216±260 μg/L, L 203±214 μg/L) of zooplankton in comparison to the open-water zone. In trophic structure, rotifers were most abundant on both stations, with the most dominant microfilter-feeder species Keratella cochlearis. Differences in physico-chemical factors between station were not statistically significant (p > 0,05). Water transparency, conductivity, water temperature and concentrations of dissolved and suspended organic matter significant positively corelated (p < 0,05) with total zooplankton biomass and species diversity index (H’). Effect of fish predation manifested in dominant biomass of copepods in open-water zone (body size 1000 – 1500 μm, size category VII), and dominant biomass of cladocerans in littoral zone (body size 500 – 1000 μm, size category VI). The results of this study suggest that the percentage of macrophyte covered area and water transpareny have a significant influence on primary production, and therefore on trophic structure and size categories distribution of zooplankton.

Item Type: Thesis (Diploma thesis)
Keywords: zooplankton, water transparency, trophic groups, body size, fish predation
Supervisor: Špoljar, Maria
Date: 2010
Number of Pages: 50
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 08 Sep 2014 10:07
Last Modified: 08 Sep 2014 10:07
URI: http://digre.pmf.unizg.hr/id/eprint/2654

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