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Croatian Journal of Fisheries : Ribarstvo, Vol. 74 No. 1, 2016.

Original scientific paper

https://doi.org/10.1515/cjf-2016-0002

ZOOPLANKTON STRUCTURE IN TWO INTERCONNECTED PONDS: SIMILARITIES AND DIFFERENCES

Maria Špoljar orcid id orcid.org/0000-0003-1006-8300 ; University of Zagreb, Faculty of Science, Department of Biology, Zoology, Zagreb, Croatia
Tea Tomljanović orcid id orcid.org/0000-0002-5917-3315 ; University of Zagreb, Faculty of Agriculture, Zagreb, Croatia
Tvrtko Dražina ; University of Zagreb, Faculty of Science, Department of Biology, Zoology, Zagreb, Croatia
Jasna Lajtner ; University of Zagreb, Faculty of Science, Department of Biology, Zoology, Zagreb, Croatia
Helena Štulec orcid id orcid.org/0000-0002-6906-0832 ; Ministry of construction and physical planning, Directorate for construction and energy efficiency in the buildings sector, Zagreb, Croatia
Daniel Matulić orcid id orcid.org/0000-0002-2724-8407 ; University of Zagreb, Faculty of Agriculture, Zagreb, Croatia
Jelena Fressl ; Dvokut ECRO Ltd., Zagreb, Croatia

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Abstract

The research of zooplankton diversity, abundance and trophic structure was conducted during the summer period in pelagial zone on the longitudinal profile of the Sutla River Backwater. Investigated site consists of two interconnected basins: transparent Upper Basin with submerged macrophytes and turbid Lower Basin without macrophytes in the littoral zone. In the Upper Basin, abundance and diversity of zooplankton in the pelagial was higher in comparison to the Lower Basin, with prevailing species of genus Keratella as microfilter-feeder, and genera of Polyartha and Trihocerca as macrofilterfeeder rotifers. On the contrary, in the Lower Basin, crustaceans dominated in abundance. Microfilter-feeder cladoceran (Bosmina longirostris) and larval and adult stages of macrofilter-feeder copepod (Macrocyclops albidus) prevailed in the Lower Basin. Fish predation pressure was more pronounced in the pelagial of the Upper Basin, indicated by low cladoceran abundance in the surface layer. Although the studied basins were interconnected, results indicate significant (Mann-Whitney U test, p < 0.05) differences in the zooplankton structure as a potential result of the macrophyte impact on environmental conditions and fish predation pressure.

Keywords

Submerged macrophytes; Transparency; Turbidity; Predation; Fish

Hrčak ID:

154672

URI

https://hrcak.srce.hr/154672

Publication date:

21.3.2016.

Article data in other languages: croatian

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