Seasonal variation in physico-chemical properties and zooplankton biomass in Greater Zab River -Iraq

صخلملا Seasonal variation of zooplankton biomass has been carried out at two selected sites on Greater Zab River. Monthly samples of water were collected during period from January to December 2008. Some physico-chemical properties of water were studied including water temperature (from 8 to 30.5 C), hydrogen ion concentration (from 6.3 to 8), EC (from 255 to 821 μs.cm), turbidity (1085 NTU), dissolved oxygen (from 4.2 to 12.35 mg.l), BOD5 (from 0.6 to 24 mg.l), COD (from 15 to 294 mg.l), ammonium level (from 0.51 to 1.66 μg NH4-N.l), nitrite (from 29.1 to 71.3 μg NO2 N.l), nitrate (from 112.9 to 327.4 μg NO3N.l), reactive phosphate (from 195.7 to 558 μg PO4-P.l) and calcium concentration (from 24.7 to 72 mg.l). Concerning planktonic communities, the results showed that the total zooplankton number was ranged from 100 individuals.l to 6650 individuals.l and the total phytoplankton population was 18773 cell.l to 269448 cell.l. Statistical analysis showed that there was a positive correlation between total count of zooplankton and total count of phytoplankton during studied period with r = 0.38 in site (1) and r = 0.31 in site (2). However, the results of water quality of Greater Zab River showed that the values of WQI were 66.15% and 64.61% respectively in both studied sites which can be considered as fair according CCME (2001) and medium according EU (1975). تامئاھلا عمتجمل ةيلصفلا تاريغتلا ةسارد مت و ةيتابنلا يف ةيناويحلا ريبكلا باز رھن ىلع نيعقوم . للاخ ايرھش تانيعلا تعمج َ ةرتف نوناك لولاا نوناك ىلا يناثلا 2008 . و دق ت ةيوايميكلا تافصلا ضعب ةسارد م يلاتلا وحنلا ىلع جئاتنلا تناكو ءاملل ةيوايزيفلاو : ءاملا ةرارح ةجرد ) نم تحوارت 8 ىلا 30.5 ( ينيجوردياھلا نويا زيكرت ، ) نم تحوارت 6.3 ىلا 8 ( يئابرھكلا ليصوتلا ، ) نم تحوارت 255 ىلا 821 زنمسوركيم / مس ( هايملا ةروكع ، ) 10 ىلا 85 ع ةدحو ةروك ( ، باذملا نيجسكولاا ) 4.2 ىلا 12.35 مغلم / رتل ( يويحلا بلطتملا ، نيجسكولال ) 0.6 ىلا 24 مغلم / رتل ( نيجسكولال يوايميكلا بلطتملا ، ) 15 ىلا 294 مغلم / رتل ( اينوما ، ) 0.51 ىلا 1.66 مارغ وركيم NH4 N/ رتل ( تيرتن ، ) 29.1 ىلا 71.3 مارغ وركيم NO2 N/ رتل ( تارتن ، ) 112.9 ىلا 327.4 مارغ وركيم NO3 N/ رتل ( تافسوفلا ، ) 195.7 ىلا 558 مارغ وركيم PO4 P/ رتل ( مويسلاكلا نويا زيكرتو ) 24.7 ىلا 72 مغلم / رتل .( ةسارد ىلا ةبسنلاب اما ةلتك جئاتنلا ناف ،تامئاھلا نيب حوارتت تناك ةيناويحلا تامئاھلا عومجم ناب تحضوا 100 درف / ىلا رتل 6650 درف / جمو رتل حوارتت تناك ةيتابنلا تامئاھلا عوم نيب 18773 ةيلخ / ىلا رتل 269448 ةيلخ / رتل ناب ايئاصحا ترھظ امك ، تناك ثيح ةيتابنلاو ةيناويحلا تامئاھلا دادعا نيب ةبجوم ةقلاع كانھ ةميق r= 0.38 و لولاا عقوملل r= 0.31 يناثلا عقوملل . نا امك جئاتن ىلع ادامتعا هايملا ةيعون رابتخا َ ) EU, 1975 ( و ) CCUM, 2001 ( تناك هايملا ةيعون ميقت ةميق ناب تحضوا 66.15 % و 64.61 % ىلع لاك يف ىلاوتلا نم ةساردلا يتطحم ةمج و كسوكروك سبد . © 2010 Jordan Journal of Biological Sciences. All rights reserved