Akademik Veri Yönetim Sistemi
Applied Ecology and Environmental Research, cilt.18, sa.5, ss.6137-6162, 2020 (SCI-Expanded)
© 2020, ALÖKI Kft., Budapest, Hungary.Lake Tortum is a natural deep and landslide-set lake located in the northeast of Erzurum in the Eastern Anatolia Region of Turkey. The lake is under the influence of anthropogenic activity and pollution from agriculture. This paper, it was aimed to estimate the trophic level of Lake Tortum together with biological and some physicochemical parameters, as well as the external phosphorus load of this lake. The Lake was determined to be mesotrophic according to Secchi depth, total phosphorus concentration and chlorophyll-a tests. External phosphorus load was calculated above the critical phosphorus value determined for lakes. The lake has been shown in the eutrophication phase due to the nutrient inflow results exceeding the lake’s loading capacity, the presence of some eutrophic species in the phytoplankton composition, and the periodic increase in blue-green algae. A total of 51 phytoplankton species were identified in the study period, belonging to 12 functional groups. The seasonal succession of dominant functional group is code LM (Ceratium hirundinella). The mean value of Q index in Tortum Lake was estimated as 1.88 which pointed out the tolerable ecological quality status.