Impact of the littoral zone heterogeneity on the macroinvertebrate assamblage in shallow lakes

Ercegovac, Zvonimir (2016) Impact of the littoral zone heterogeneity on the macroinvertebrate assamblage in shallow lakes. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

The study of macrozoobenthos was conducted during 2013 in two water bodies of differing origins, morphometry, trophy degree, macrophyte coverage and composition: backwater of the Sutla River and oxbow lake Škčev kut. The study aims were to determine: 1. spatial oscillations of macroinvertebrate diversity and abundance in habitats of differing macrophyte coverage; 2. spatial and temporal fluctuations of differing macroinvertebrate size categories; 3. trophic structure and the potential role of macroinvertebrates in the food webs of shallow lakes. 57 taxa were determined. The diversity was mostly contributed by representatives of Heteroptera (12 taxa) and Diptera (11 taxa). The greatest abundance and diversity were observed in the Upper Basin of the river Sutla, with an average abundance of 273 ± 642 ind./m2 and 24 taxa, whereas the lowest umber and diversity were observed in the littoral of the Škrčev kut, with an average abundance of 80 ± 211 ind./m2 and 13 taxa. At the extremely low depth ( < 1m) and high turbidity study sites at both water bodies, individuals larger than 4 − 6 mm were dominant, whereas in the littoral of the Upper Sutla river Basin, which exhibited greater habitat diversity with submerged macrophytes, smaller individuals prevailed (0.5 − 3 mm). At the habitats of high turbidity and low habitat diversity, detritivorous Diptera were most abundant, whereas at the habitats with rich macrophyte cover in the littoral zone, besides Diptera, most abundant were Ephemeroptera, presented with numerous scrapers. Abundance of predators was highest on SGB and lowest on the ŠK study site. Results of this study indicate that biotic interactions significantly affected the macrozoobenthos structure in comparison to abiotic parameters. In general, the abundance and diversity of macroinvertebrates increased with habitat diversity, and decreased with increasing trophic level and reducing the diversity of littoral zone, thus influenced on the feeding and size structure of macroinvertebrates of the lake.

Item Type: Thesis (Diploma thesis)
Keywords: benthic macroinvertebrates, abundance, diversity, trophic structure, size categories, biotic interactions
Supervisor: Špoljar, Maria
Co-supervisor: Sertić Perić, Mirela
Date: 2016
Number of Pages: 33
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 25 Mar 2016 08:46
Last Modified: 25 Mar 2016 08:46
URI: http://digre.pmf.unizg.hr/id/eprint/4650

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