Abstract
The study includes the phytoplankton compositions in Alaaras Lake , in summer 2008 and winter , spring , summer 2009. Samples were collected from three selected sites at north , middle and south of lake. A total of 74 taxa of phytoplankton were identified . The diatoms were the dominated by 44 taxa represented 82.8% of the total indentified species, followed by green algae ( Chlorophyta ) of 20 taxa (8.5%), and blue green algae (Cyanophyta of 7 taxa (7.2%). Tow species were recorded of Pyrrophyta and one species of Euglenophyta .The seasonal variation for Diatoms density showed tow peaks during Autumn and summer. Few species were dominated during the most studied period such as Cocconeis placentula var. euglypta, Synedra fasciculata and Cymbell affinis .
Highlights
Samples were collected from three selected sites at north, middle and south of lake
The diatoms were the dominated by 44 taxa represented 82.8% of the total indentified species, followed by green algae ( Chlorophyta ) of 20 taxa (8.5%), and blue green algae (Cyanophyta of 7 taxa (7.2%)
Tow species were recorded of Pyrrophyta and one species of Euglenophyta .The seasonal variation for Diatoms density showed tow peaks during Autumn and summer
Summary
الهائمات النباتية في جزيرة الاعراس السياحية – العراق التوالي .وجاءت بعدها الطحالب الخضر ثم الخضر المزرقة .سجلت سيادة الدايتومات للهائمات النباتية في جميع الخزانات والبحيرات المحلية في أهوار جنوب العراق .بحيرة سامراء[.]7،37 وبحيرة القادسية ( )31وبحيرة الحبانية [ ]35ونهر ديالى []32وكذلك نهري دجلة [ ]39والفرات [ ]21،51وفي نهر ايداهو Idahoفي الولايات المتحدة الامريكية [ ]55وخزان للماء في افريقيا [ .]51ويمثل التوزيع الفصلي لكثافة المجاميع الرئيسة للهائمات النباتية بظهور زيادتيين واضحتين خلال فصلي الخريف والصيف في الموقع 1للدايتومات والطحالب الخضر المزرقة والخضر على التوالي في حين كانت هناك زيادتان واضحتان في فصلي الخريف والشتاء في الموقع 5 للمجاميع السابقة ,وزيادة واحدة في فصل الشتاء
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