Population density and reproduction of Niphargus dalmatinus (Crustacea, Amphipoda) along the river Cetina

Jandrić, Nina (2009) Population density and reproduction of Niphargus dalmatinus (Crustacea, Amphipoda) along the river Cetina. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

The reproductive traits of Niphargus dalmatinus were examined from August 2007 to August 2008 at eight study sites located in the upper, middle and lower reaches of the Cetina River and its tributary the Ruda River. Although the species belongs to the subterranean genus, it inhabits epigean streams in the Middle Dalmatia. Whereas the ecology of the species in the epigean habitats remains unknown, the primary goal was to establish the ecology and reproductive biology of the species. Influence of abiotic factors on appearance of ovigerous females was the main focus of the research. The obtained results pointed out a strong relationship between longitudinal variation in population density, appearance of ovigerous females and water temperature. The highest population density of the species was recorded in the eucrenal zone of the Cetina River, with the water temperature below 10°C. The ovigerous females were recorded year-round in the upper and lower reaches only, with high density during the autumn (October) and spring (March, April, May). The populations studied in this work appears to be bivoltine, but the data are not sufficiently consistent to confirm the hypothesis. Amplexus and intersex individuals of N. dalmatinus were not observed in our study.

Item Type: Thesis (Diploma thesis)
Keywords: Niphargidae, population density, sex ratio, ovigerous females, reproductive cycle, springs
Supervisor: Gottstein, Sanja
Co-supervisor: Žganec, Krešimir
Date: 2009
Number of Pages: 48
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 09 Sep 2014 12:50
Last Modified: 09 Sep 2014 12:50
URI: http://digre.pmf.unizg.hr/id/eprint/2683

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