Naslov
The assessment of nutrient availability for the growth of freshwater green algae Chlorella kessleri by bioassay (Lake Sakadaš, NP Kopački Rit)

Autori
Horvatić, Janja ; Peršić, Vesna ; Popović, Željko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
36th International Conference International Association for Danube Research - 50 years of IAD: "Danube.River.Life" / - Beč : Lebensministerium fur das Bundesamt fur Wasserwirtschaft, Wien, 2006

Skup
36th International Conference - 50 Years of IAD

Mjesto i datum
Beč, Austrija, 04.09.2006. - 08.09.2006

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
enrichment bioassay; N and P limitation; Chlorella kessleri; Lake Sakadaš.

Sažetak
The influence of nutrient availability on the growth of Chlorella kessleri was investigated in water samples of Lake Sakadaš, from March to September 2005. A nutrient enrichment bioassay was performed to test nitrogen and phosphorus limitation of freshwater green algae C. kessleri. A statistically significant correlation (r = 0.964, P<0.01) was established between the total biomass of C. kessleri in original water samples and nitrate concentration in situ. In the nutrient enrichment bioassay, only the addition of nitrogen showed a statistically significant influence on the growth rate of C. kessleri. In order to quantify the established nutrient limitation, the effect of N (in final concentrations of 5, 10 and 100 mg l-1) and P (in final concentrations of 0.15, 1.5 and 15 mg l-1) addition was expressed as the degree of nutrient limitation (∆ r in mg l-1 per day). The algal response to nitrogen enrichment showed a linear increase (r = 0.997, P<0.05) of the degree of N limitation from March (∆ r = 0.171) to July (∆ r = 0.866).

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA