engleski

Abundance and colonisation of attached diatoms in the Zrmanja Estuary, Adriatic Sea

The colonisation of a periphyton community on Plexiglas plates was observed in the oligotrophic karstic Zrmanja Estuary (eastern Adriatic coast), during the summer of 2000. Maximum periphyton biomass was detected at days 19-25 (chlorophyll a 1630-1674 ng cm^-2). The dominant periphitic microalgae were diatoms (maximum concentration of fucoxanthin 1371.4 ng cm^-2, maximum abundance 1.8 x 10^7 cells cm^-2). Among the 69 determined taxa, the highest species diversity was found in the genera Navicula (13 taxa), Nitzschia (12 taxa) and Achnanthes (6 taxa). The diatom Amphora coffeaeformis var. coffeaeformis (C.A. Agardh) Kützing dominated throughout the entire colonisation period (100% frequency of appearance, abundance up to 1.6 x 10^6 cells cm^-2).

Diatoms; periphyton; Zrmanja; estuary; Adriatic Sea

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