Environmental study on the diversity and distribution of phytoplankton in the AL-Yusifiyariver - Iraq

A. Mahdii, Beadaa

	Environmental study on the diversity and distribution of phytoplankton in the AL-Yusifiyariver - Iraq
Tikrit Journal of Pure Science
Article 1, Volume 17, Issue 3, 2012, Pages 77-84
Author
Beadaa A. Mahdii
Abstract
The study included three locations for this river were selected .These were the 7 Km before the city of Yosfia when the Azza , 6 km after city of Yosfia when the Saadat and 4 km after city of Rasheed when the Waziri . Samples were collected monthly from October 2010 to July 2011. The study in involved the physical & chemical characteristics for the river water and included air and water temperature, electrical conductivity, salinity, pH, dissolved oxygen, Percentage saturation of oxygen and turbidity,the study took typical formation for phytoplankton, its density & its seasonal & locations variation. The results recorded that water temperature is linked with air temperature during the study period and in all locations. Electrical conductivity and salinity was higher in the water of site (3) than in the other sites. The pH was inclined to light alkalinity, its values ranged annualy between (7.25-8.15). water had good aeration except location 3, which recorded in it low values for dissolved oxygen. Higher values of turbidity were found during spring season in all station. (132) Classified units may diagnoses as belonging to phytoplankton during the present study. (68) Units were included in Bacillariophyceaeclass, (34) units in Chlorophyceae class, (19) units in Cynophyceae class, (7) units in Euglenaphyceae class, (4) units in Chrysophyceae. . Many genera whet her from diatoms or else many species for example (Nitzschia, Navicula, Spirogyra, Euglena and Achnanthes). Density data showed the dominancy of class Bacillariophyceae, among which the pennals diatoms rank was higher or denser than centrals diatoms rank. The highest density of phytoplankton (2508.7X 103) indL was record in station (2). The highest biodiversity (0.368) was record in station (2) according Shanon-Wiener Diversity Index .

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