عنوان مقاله [English]
This study investigated food chains and fishes feeding habits in Laar Reservoir ecosystem. It investigated monthly hydro-biological parameters such as density and distribution of zooplankton, animal macro-benthic and fish in 12 different sampling stages from June until November in 2008 and 2009. Zooplankton sampling has been done vertically using with Juddy Net, macrobentic using with Grab (400 cm2), Surber (1600 cm2 and hand net (2500 cm2) and fishes were caught using with Cast net, Electro-Shocker in near to Dam and Emam-Pahnak (Delichai), Ab-Sefid, Elarm and Kamardasht tributaries stations. This study showed there were 21 genera and species belong to 3 Zooplankton orders in Laar reservoir which Cladocera order was dominant and it constituted about 55.81% of zooplankton population in all studied period. The highest cell density of zooplankton associated with the Orders of Cladocera (48050±0.05 number/m2) and Rotatoria (24020±0.02 number/m2) in June. There were 98 genera and species in 12 orders of macrobenthic and Diptera order with abundance of 676 number/m2 and biomass of 1.79 gr/m2 in 2008 and 767 number/m2 and biomass of 2.50 gr/m2 in 2009 was dominant. There were 5 fish species which Salmo trutta fario constitutedmore than 95 percent of caught fish population and the averages of its weight and fork length were measured 136.86±103.4 g and 212.81±49.6 mm, respectively. The two-way ANOVA showed that sampling months and studied stations affect fauna abundance (P<0.05). Biological studies indicated that this reservoir has low potential to planktonic productivity and due to geographical location of this dam, remarkable temperature differences can be observed in different years especially in fall and winter, which is biologically important. In the study, we record many species of zooplankton and animal macrobentic for the first time from Iran.
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