engleski

Sastav planktona i odnos faktora okoline u oligotrofnom jezeru Vrana

The work aimed to determine the abiotic and biotic factors and their influence on plankton community of the lake. Data on some relevant environmental variables and phytoplankton and crustacean zooplankton of olygotrophic Lake Vrana (Island Cres), were analysed using Canonical Correspondence Analysis (CCA). The portion of total variance described by the multivariate analysis relatively high: model explained 69.94% variance of phytoplankton and environmental data, 90.30% crustacean zooplankton and environmental data, and 58.44% of phytoplankton vs. crustacean zooplankton data. According to multivariate analysis temperature and nutrient supply appear to be the main driving factors for phytoplankton dynamics. The species Ceratium hirundinella (Dinophyceae) was the dominant species in the phytoplankton community, and showed the greatest correlation with copepod Cyclops abyssorum abundance. Three cladoceran species were present in the lake. Their dynamics was determined by the food supply namely the appearance of certain phytoplankton species.

phytoplankton; macrozooplankton and multivariate analysis

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