Study on the structure of phytoplankton population in the Lar dam lake
Subject Areas : Marine Biology
1 - Dept. of Fisheries, Islamic Azad University Tehran North Branch
Keywords: population structure, Phytoplankton, Lar reservoir dam,
Abstract :
In this study, in order to investigate limnological and biological parameters of Lar dam lake such as indentification determination of the density and distribution of phytoplanktons, sampling were done during 3 months (July-August-September) and fixed in formalin 4% and transferred to laboratory for further investigation under inverted microscope. In this study, 24 genera which belonged to 5 phytoplanktonic phyla were identified. Among these genera, 8 were belonged to Ochriphyta, 7 generaus was belonged to Chlorophyta, 3 genera were belonged to Dinophyta, 1 genera were belonged to Euglenophyta, 5 generaus was belonged to Cyanobacteria. In this reservoir dam, Ochriphyta was the dominant phytoplanktom phylum with being annually 88.59% of the population, and followeding by genera Asterionella was dominat samples. The others Other phytoplanktonic phylla were: Chlrophyta, Cyanobacteria, Dinophyta and Euglenophyta with following frequencies: of 6.48%, 2.88%, 1.76% and 0.25% respectively, followed by the and following genera: (Pandorina, Scendemus, Closterium, Oocystis, Gonium, Chodatella and Chlorella), (Anabaena, Merismopedia, Oscillatoria, Gleocapsa, and Coelosphaerium), (Peridinium, Gymnodinium and Ceratium) and (Euglena). In all of the sampling months, the highest average density was belonged to Ochriphyta with 1560733 number per liter and the dominant genus of this phyllum which was observed in high number during in a months, was Asterionella. After that was, followed by Chlorophyta with average number of 164600 per liter and its dominant genera were Scenedesmus, Pandorina and Chlorella, respectively. Biological studies indicated that this reservoir had low planktonic generation potential.
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