Diversity of the aquatic malacofauna (Mollusca: Gastropoda, Bivalvia) of the Vrana Lake Nature Park

Srebočan, Marta (2013) Diversity of the aquatic malacofauna (Mollusca: Gastropoda, Bivalvia) of the Vrana Lake Nature Park. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

The aim of this study was to determine the composition of the community of freshwater molluscs in the Vrana Lake Nature Park and to establish their density and age structure. The survey was conducted during the 2011 at a total of 12 sites. Qualitative and quantitative samples were collected from different substrates. A total of 22 groups of invertebrates were recorded. During the investigation we found 15 snail species and 6 bivalve species. The snails Stagnicola fuscus, Acroloxus lacustris and Theodoxus fluviatilis were represented on the most locations. One invasive mussel species Dreissena polymorpha, was also found. The age structure of certain snail species was analysed, which showed that at the beginning of the year adult individuals dominated, and the number of juveniles gradually increased from May and July, indicating that the spawning process took place in spring. Trophic structure of molluscs was also analysed and we found that species can be divided into five functional feeding groups. Finding of Anisus vorticulus is very important from the aspect of nature conservation because the species is strictly protected in Croatia.

Item Type: Thesis (Diploma thesis)
Keywords: molluscs, population density, age structure, size category, functional feeding groups
Supervisor: Lajtner, Jasna
Date: 2013
Number of Pages: 63
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 29 Sep 2014 12:52
Last Modified: 29 Sep 2014 12:52
URI: http://digre.pmf.unizg.hr/id/eprint/2867

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