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MONTHLY VARIATIONS OF THE EPIPELIC AGAL COMMUNITIES IN AL-AaRAS TOURIST ISLAND LAKE , BAGHDAD - IRAQ | ||
| Iraqi Journal of Science | ||
| Article 1, Volume 53, Issue 4, 2012, Pages 735-742 | ||
| Author | ||
| Abdul-Nasir A. M. Al-Tamimi | ||
| Abstract | ||
| Three sites at the Al-aaras tourist island lake were selected to study the physico-chemical characters and epipelic algal communities . Monthly samples for 12 month were taken starting January 2009 . It was found that the lake is alkaline , well oxygenated ,oligohaline with low electrical conductivity and hard water . The concentration of reactive nitrite ( NO3) were available and low concentration of reactive phosphate ( PO 4 ) . A total of 67 taxa were identified dominated by Bacillariophyceae ( 65.7 % ) followed by Cyanophyceae ( 16.4 % ) and Chlorophyceae ( 13.4 % ) . Clear seasonal variations in the total density of epipelic algae were found at different studied sites with a binomial pattern at spring and autumn . The total cell number was ranged between 0.09 x 10 4 – 14.0 x 10 4 Cell / cm² . Almost similar binomial peaks also found in Bacillariophyceae , out of 11 taxa identified of Cyanophyceae , 6 were belong to Oscillatoria . While Scenedesmus quadricauda was composed of high cell number of Chlorophyceae . The dominant species were Cymbella affinis , Navicula cryptocephalla and Nitzschia hungarica which are all originally benthic Key words: Epipelic algae , Physico- Chemical Caracters , Al-aaras Turiste Island Lake , Iraq . | ||
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