Effect of Carassius gibelio on trophic status and food web of Neour Lake

Neour Lake is one of the important lakes in the Ardabil Province and was famous for its amphipod gamaros. The invasive Carassius gibelio have been observed in lake in 2003 while has successfully established populations over period of winter ice condition and grow rapidly in lake. In this survey the taxonomic status and frequency of phytoplankton, zooplankton and benthic macroinvertebrates were monthly investigated in order to detect the effects of invasive species on food web and trophic state. The result indicated that the lake food web varied significantly while the phytoplankton frrqency was high with dominance of cyanophyta group and the rotifer were the dominant zooplankton species and tubificede were the only species of benthic fauna. The gammarus population was diminished too. Overall trophic status of the lake showed to be highly eutrophic. The results indicat that the invasive C. gibelio not only a competitor for food to other fishes bout alter the food web and trophic state as well.

کلیدواژه ها:

Neour Lake ، Carassius gibelio ، Food web ، Trophy level.