Seasonal variations of phytoplankton community and it's relationship with occurrence of zebra mussel Dreissena polymorpha (Pallas, 1771) at Haditha reservoir.

	Seasonal variations of phytoplankton community and it's relationship with occurrence of zebra mussel Dreissena polymorpha (Pallas, 1771) at Haditha reservoir.
Magazine of Al-Kufa University for Biology
Article 1, Volume 2, Issue 0, 2010, Pages 236-245
Abstract
Seasonal variations of phytoplankton community were studied at Haditha reservoir from 15/2/2002 to 18/3/2003 .Water samples were collected monthly to study the phytoplankton seasonally. 55 species of algae were identified at the location, including 32 species of diatoms (Bacillarophyta), 13 species of Chlorophyta, 7 species of Cyanophyta and two species of Euglenaphyta and one species of Pyrrophyta. The species (Scenedesmus quadricuda, Oscillatoria sp., Melosira granulata, Nitzschia palea and Navicula cryptocephala) were recorded throughout the study period at the location. Results showed there was a peak of phytoplankton density in autumn at the reservoir (278 x 103 cell/l). Also the results suggested that there was reduction (35 times) in the high annual density of phytoplankton in this study compared with other studies (carried out throughout 1993) at Haditha reservoir in the same area . As a conclusion , there was a negative effect of zebra mussel on the density of phytoplankton .

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