Abstract
A study of Zooplankton community has been carried out at four selected sites on Dukan Lake. Samples of water and zooplankton were collected monthly for the period from July 2015 to February 2016. Some physical and chemical properties of water were studied and the results showed that the air temperature were ranged from 0 to 36.16 °C, water temperature ranged from 2.83 to 34.66 °C, hydrogen ion concentration of studied sites were found to lie in alkaline side, it was ranged between 6.87 to 8.57, electrical conductivity ranged from 190.79 to 850.08 µs.cm¹, turbidity ranged from 0.9-7.7 NTU, and dissolved oxygen from 3.3 to 6.8 mg.l-¹ while BOD5 were ranged from 0.53 to 34.66 mg.l-¹. Concerning to the zooplankton, 37 species were identified which belonged to Cladocera (48.38%), Copepod (43.28%), Rotifera (8.23%), Targigrada (0.08%) and Cnidaria (0.1%). The medusa of Craspedacusta sowerbii Lankester (1880) was recorded for the first time in Iraq. Regarding to zooplankton community, rotifer were ranged between 0 to 690.91 ind.m-3, Copepoda from 54.55 to 5927.27 ind.m-3 and Cladocera ranged from 18.18 to 6072.73 ind.m-3. According to Shanon-Weiner index, species diversity for zooplankton invertebrates was ranged from 0.325 to 1.091 bits/ind. Jaccard’s similarity index showed that the highest similarity was recorded between site (1) and site (4) with 40.74%.
Highlights
Zooplanktons are invertebrates occupy a central position in the food webs of aquatic ecosystem and they form a food webs for the carnivorous as well as omnivorous fishes
The minimum value of water temperature was recorded in site 2 during January, 2016, whereas, the maximum value was recorded in site 3 during July, 2015
The monthly variations of water temperature of studied sites may be due to change in climate during seasons which affected by air temperature [18]
Summary
Zooplanktons are invertebrates occupy a central position in the food webs of aquatic ecosystem and they form a food webs for the carnivorous as well as omnivorous fishes. They are depending heavily on algae, bacteria, protozoa and other invertebrates for their feeding [1, 2]. 14 genera of Rotifera were recorded by [10] in Darbandikhan lake, the results showed that density of Rotifera in the studied sites ranged from 4 to 134 ind.m-3 This present study aims to survey and study of zooplankton community in Dukan Lake Some chemical and physical parameters of lake water were measured
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