Naslov
Trophic Relationship in the Pelagic Community of the Borovik Reservoir Three Years after Revitalization

Autori
Mihaljević, M. ; Bogut, Ivan ; Novoselić, Daniela

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings / 33rd Conference of International Association for Danube Research / Horvatić, Janja - Osijek : Pedagoški fakultet Osijek ; Hrvatsko ekološko društvo Zagreb, 2000, 343-350

Skup
33rd Conference of International Association for Danube Research

Mjesto i datum
Osijek, Hrvatska, 03.09.2000. - 09.09.2000

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
phytoplankton; zooplankton; fish; trophic relationship

Sažetak
The Borovik Reservoir (water surface 23 km2 ; mean depth cc 5m), constructed in 1970, was emptied in 1993 and almost all fish were harvested. The objective of this study was to analyze the structure of the pelagic community and the trophic relationship in linear food chain: ichtyofauna-zooplankton-phytoplankton, three years after refilling of the reservoir. Sampling was done in two-week intervals between May and October 1996. According to the results of three catches, six fish species have been identified: carp, tench, prussian carp, common perch, sunfish and largemouth back bass. The most abundant were planctivorous fish, which had strong feeding pressure on the zooplankton. Small cladocerans and rotifers were dominated in the zooplankton community. A significant correlation between chlorophyll-a and zooplankton density suggests that there was top-down impact of zooplankton on chlorophyll-a, i.e. the phytoplankton community, in which large inedible phytoplankton species were dominant. Top-down effects are evident from the top of the food web down to the phytoplankton level in the mesotrophic ecosystem of the Borovik Reservoir.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA