Analysis of chlorophyll-a concentrations in the Danube river [Serbia] during 2002-2005
2006
Obradovic, V. (Institut za vodoprivredu Jaroslav Cerni, Beograd (Serbia)), E-mail: oveca@eunet.yu | Janac, M. (Institut za vodoprivredu Jaroslav Cerni, Beograd (Serbia)) | Milenkovic, N. (Institut za vodoprivredu Jaroslav Cerni, Beograd (Serbia))
This paper presents the results of investigation on photosynthetic pigments, chlorophyll a in the river Danube (Serbia) during 2002-2005. Field investigations were carried out with seasonal dynamics on the river strech between 1112 and 851 km. Exceptionally in September, during low water period, investigations were carried out on the river strech between km 1260 - 851, including the main tributaries: Tisza, Sava, Velika Morava and Pek. The concentrations of chlorophyll a and phaeophytin a were determined using the standard ISO 10260/92 methodology, variant B. Pigment extraction was done in hot ethanol immediately after sampling, on board of a research ship. The results revealed seasonal concentration dynamics of the mentioned indicators of primary productivity and physiological status of the algae community where fall of chlorophyll a from the upstream towards downstream profiles was evidenced.
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