Naslov
Algal growth potential of Chlorella kessleri FOTT et NOV. in comparison with in situ microphytoplankton dynamics in the water of the marshes of Lake Sakadaš

Autori
Horvatić, Janja ; Mihaljević, Melita ; Stević, Filip

Izvornik
Periodicum biologorum (0031-5362) 105 (2003), 3; 307-312

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

Ključne riječi
algal growth potential (AGP); Chlorella kessleri; nitrates; phosphates; microphytoplankton biomass

Sažetak
The unicellular green alga Chlorella kessleri FOTT et NOV. is suitable for the evaluation of the AGP by the miniaturized bioassay method in order to evaluate the trophic level and the productivity and toxicity of water ecosystems. The aim of this paper is to compare in situ phytoplankton growth with the influence of the addition of nitrates and phosphates into the original waters on the growth potential of C. kessleri in Lake Sakadaš. Samples were collected once a month from March to December 1999, from a site in the central part of Lake Sakadaš. The "tubular-chamber" method was used for the quantitative analysis of phytoplankton. Fresh weight phytoplankton biomass was calculated from the volume of phytoplankton units. The miniaturized bioassay method was used to establish the algal growth potential of C. kessleri. The total microphytoplankton biomass in situ varied 6.82 - 115.62 mg/l. The following sequences in the phytoplankton successions were evident: Bacillariophyceae community (March) ; Dinobryon community (April) ; depression of phytoplankton (May) ; algal bloom of blue greens (July) ; Synura bloom (September) ; Euglenophyceae community (October-December). Results of the AGP of C. kessleri showed that the addition of nitrates has caused a statistically significant increase of AGP. The addition of phosphates did not have an influence on the AGP only in June, September and October. The in situ microphytoplankton biomass dynamics as well as the qualitative composition and seasonal succession of phytoplankton indicate eutrophic conditions of Lake Sakadaš. According to the results of the AGP of C. kessleri, the water of Lake Sakadaš can be classified as highly productive and the algal growth was N-limited.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA