Abstract
Some water quality parameters (Secchi disk depth, water temperature, dissolved oxygen, pH, conductivity, chlorophyll a, NO2-N, NO3-N, NH4-N, PO4-P) and zooplankton fauna were determined in the Kozan Dam Lake. While the quality of the reservoir water was first class water in terms of temperature, dissolved oxygen, NH4-N, PO4-P, it was second-class water in terms of conductivity, pH, NO3-N. In total, 50 zooplankton species belonging to 26 families were determined (29 species belonging to 17 families from Rotifera, 15 species belonging to 7 families from Cladocera and 6 species belonging to 2 families from Copepoda). Brachionidae (Rotifera) was the most species rich family with 7 species, followed by Chydoridae (Cladocera) and Cyclopidae (Copepoda) with 6 and 5 species respectively. The most dominant species were Synchaeta pectinata (38.33%) from Rotifera, Bosmina longirostris (5.71%) from Cladocera and Cyclops vicinus (0.67%) from Copepoda. At the same time, the species found in every month were Asplanchna priodonta, Polyarthra dolichoptera, Bosmina longirostris, Ceriodaphnia pulchella, Cyclops vicinus and Diacyclops bicuspidatus. In the study, Rotifera was the most abundant group with 67%, followed by Cladocera with 29% and Copepoda with 4%. On the other hand, total Rotifera was found mostly in December (10099 individual/ m3), Cladocera in January (4928 ind./m3) and Copepoda in September (1091 ind./m3).
Highlights
Turkey has very rich potential in terms of lakes and dam lakes
Water temperature varied from 7.97°C (December at second station) to 24.57°C (June at second station) with a mean value of 16.51 ±5.32°C (Figure 2B)
Determined water quality parameters, for animals in water are observed to be within the normal values
Summary
Tugyan and Bozkurt 2019 - LimnoFish 5(3): 147-158 They have been known as an important energy resource for small sized fish that, in turn, provide energy to piscivorous fish consumers higher up in the food web in fresh water. Crustacean plankton has been described as preferred fish food items by several authors (Zaret 1972; Dodson 1974; Ayodele and Adeniyi 2006) They are preferred by fishes to their Rotifera counterparts for several reasons. Cyclopoid copepods have been described as effective predators of rotifers, and so are some calanoid species which may include rotifers in their diets too (Williamson and Butler 1986; Schulze and Folt 1990) Aside their importance in fisheries, crustacean plankton (some cyclopoids) are ecologically important by suppressing mosquito larvae (Alekseev 2002). That's why, studies on zooplanktonic organisms are important for the freshwater ecosystem
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