Population dynamics of dance flies (Diptera, Empididae) at freshwater karst habitats

Barišić, Meri (2012) Population dynamics of dance flies (Diptera, Empididae) at freshwater karst habitats. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

Aquatic dance flies (Empididae; Clinocerinae, Hemerodromiinae) are insects which make an important ecological component of freshwater ecosystems, especially in running waters. Larvae and pupae live in water habitats, while adults live on land habitats close to water. The goals of this study were to analyse their preference for various microhabitats, main ecological factors that have influence on composition and abundance of specimens and emergence of species at two different freshwater karst habitats. Also correlations between abundance of aquatic dance flies and amount of their prey were explored as well as changes in population density for most common species. Sampling was made monthly from 2007 until 2010 at Plitvice lakes, on Spring of Bijela rijeka and Tufa Barrier Labudovac. Adult specimens were collected using a semi quantitative method of emergence with 6 traps placed on each location. A total of 1823 adult Empididae individuals of which 13 species were caught during four years study, 8 species from subfamily Hemerodromiinae and 5 from subfamily Clinocerinae. The greater number of species (9 species) and highest indexes of diversity was recorded at the spring of Bijela rijeka. Water temperature and photoperiod are the main ecological factors influencing their emergence, while water discharge is the main factor influencing the assemblage composition of aquatic dance flies. The highest abundance of aquatic dance flies on spring site was recorded on moss. The highest emergence rates were recorded above microhabitats with highest prey densities and with highest current velocity. Density changes over four- year period was recorded for population of Chelifera siveci. It may be caused by differences in sex ratio during the years. There are no considerable population density changes for Hemerodromia unilineata during the years.

Item Type: Thesis (Diploma thesis)
Keywords: aquatic dance flies, emergence, diversity, spring, tufa barriers, temperature, microhabitats, population density
Supervisor: Mihaljević, Zlatko
Date: 2012
Number of Pages: 58
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Grozdana Sirotic
Date Deposited: 29 May 2014 07:47
Last Modified: 18 Sep 2014 12:35
URI: http://digre.pmf.unizg.hr/id/eprint/1890

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