Naslov
Change in metazooplankton abundance in response to flood dynamics and the trophic relations in Danubian floodplain lake (Kopačk rit, Croatia)

Autori
Galir Balkić, Anita ; Palijan, Goran

Izvornik
Polish journal of ecology (1505-2249) 60 (2012), 4; 777-787

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
metazooplankton; floodplain; storage zone; bacterioplankton; trophic relations; Lake Sakadaš

Sažetak
This study investigated relationships of hydrological variability and potential food resources with metazooplankton groups: rotifera, cladocera, copepoda and nauplii. Samples were collected monthly during ice-free season from March until November in 2006. Two sampling stations were chosen, the one located in Lake Sakadaš, as a segment of Kopački Rit floodplain (Croatia), and in the River Danube. Due to hydrological conditions we divided our samples into two hydrological groups: 1. increased water level or disturbed phase and 2. decreased water level representing a more stable phase. Abundance of metazooplankton was not significantly different between hydrological groups in the River Danube. On contrary, it was significantly different between hydrological groups in Lake Sakadaš (one-way ANOSIM R = 0.688, p = 0.024), where during a decreased water level higher abundance of metazooplankton was recorded. Rotifers were the most abundant metazooplankton group during the whole investigated period at both stations and between both hydrological groups comprising almost 99 % of total metazooplankton abundance. Rotifers were significantly positively correlated with the total number of bacteria, as well as with ammonium and total phosphorous concentrations. The metazooplankton community in Lake Sakadaš was negatively influenced by flooding, while the same could not be concluded for the River Danube. Compared to the River Danube the investigated floodplain segment showed potential as a storage zone for metazooplankton development during more stable hydrological periods. During that time development of rotifers was related to the heterotrophic component of microbial food web. Hence, this investigation adds to the understanding of the metazooplankton dynamics as well as of their relations with lower trophic levels under variable hydrological conditions.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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