Diversity and structure of community of the snail fauna (Mollusca, Gastropoda) in the source area of the Cetina river

Baraka, Anamarija (2015) Diversity and structure of community of the snail fauna (Mollusca, Gastropoda) in the source area of the Cetina river. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

The main objective of this study was to determine the composition and structure of recommunities of freshwater snails in the source area of the Cetina River. Two locations were chosen: Preočki most and Crveni most. The first research location is located 1,5 km and the second one 2,5 km downstream from the source Glavas. Collection of macroinvertebrates samples took place every other month from October 2004 to August 2005. At each location three various substrates (microhabitats) were selected: pebbles, macrovegetation and sediment. Snails were separated from the benthos in the laboratory and were determined to the species level. Abundance of each species was determined based on the number of individuals, and age structure was based on morphometric measurements of their shells. During this study, a total of three snail species was found. The dominant species at both locations is Radomaniola curta germari. Horatia klecakiana is the second dominant species. Species Ancylus fluviatilis occurs in a small number of samples at the location Preočki most while at the location Crveni most was not recorded. The analysis of functional feeding guilds at researched sites showed equal share of the grazers and detritivora. Highest values of the Shannon and Simpson diversity indices were recorded at macrovegetation of Preočki most, while the lowest values of the indices were determined on the sediment of the same stations. Cluster analysis of similarity, which was carried out according to the type of habitat, showed the greatest similarity between microhabitats with pebbles of both stations, while the lowest similarity was found between microhabitats characterized by sediment. The obtained data are significant contribution to better understanding of the freshwater snail’s fauna of the Cetina River.

Item Type: Thesis (Diploma thesis)
Keywords: abundance, functional trophic groups, molluscs, upper course, growth structure
Supervisor: Lajtner, Jasna
Date: 2015
Number of Pages: 48
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Grozdana Sirotic
Date Deposited: 22 Apr 2015 11:19
Last Modified: 22 Apr 2015 11:19
URI: http://digre.pmf.unizg.hr/id/eprint/3860

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