Naslov
PERENNIAL POPULATION DYNAMICS OF DANCE FLIES (DIPTERA, EMPIDIDAE) AT FRESHWATER KARST HABITATS

Autori
Ivković, Marija ; Barišić, Meri & Mihaljević, Zlatko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
SEFS 8 - Symposium for European Freshwater Sciences Abstract Book / - Münster, 2013, 170-170

Skup
SEFS 8 - Symposium for European Freshwater Sciences

Mjesto i datum
Münster, Njemačka, 01.07.2013. - 05.07.2013

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
aquatic dance flies; emergence; diversity; spring; tufa barriers; temperature; microhabitats; population density

Sažetak
Aquatic dance flies (Empididae ; Clinocerinae & Hemerodromiinae) are important components of freshwater ecosystems, especially in running waters. Larvae and pupae live in water habitats, while adults live on land habitats close to water. They are predators as larvae and adults and thus essential for understanding aquatic food webs. 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 different freshwater karst habitats. Also correlations between abundance of aquatic dance flies and amount of their prey were explored. Sampling was made monthly from 2007 until 2010 at Plitvice lakes, on 4 sites (Spring of Bijela Rijeka, Upper reach of Bijela Rijeka, Tufa barrier Labudovac and Tufa barrier Kozjak-Milanovac). Adult specimens were collected using a semi quantitative method of emergence with 6 traps placed on each location. A total of 2378 specimens comprising 16 species were caught during four years study, 10 species from subfamily Hemerodromiinae and 6 from subfamily Clinocerinae. The dominant genus was Chelifera, while the most abundant species was Hemerodromia unilineata. All species were univoltine except Chelifera precabunda, Chelifera pyrenaica and Chelifera stigmatica that were bivoltine. 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. Highest abundance changes over four- year period was recorded for population of Chelifera siveci. It may be caused by differences in sex ratio during the years, and defined by population dynamics within years.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA