Zooplankton Fauna of Demrek Dam Lake (Kırıkhan, Hatay)

Abstract

The annual average of Secchi disk depth (100.42 ±38. 99 cm), water temperature (21.06±5.96 ºC), dissolved oxygen (8.33±0.99 mg/l), nitrate (0.43±0.19 mg/l), nitrite (0.02±0.01), hardness (172±17.27 mg/l), silica (1.17±0.28 mg/l), phosphate (0.14±0.03 mg/l), organic phosphate (1.09 ±0.56 mg/l) and chlorophyll-a (0.05±0.03 mg /l) were detected and according to these values, it was determined that the reservoir water has eutrophic and hyperneurophic character. Rotifera had the highest proportion with 45 taxa, followed by Cladocera with 11 species and Copepoda with 7 species. Asplanchna priodonta, Keratella cochlearis, Polyarthra dolichoptera, Sychaeta stylata Bosmina longirostris, Diaphanosoma birgei, and Disparalona rostrata were present throughout the whole study period. The most abundant species from Rotifera was Sychaeta stylata (26034±56482.24 ind./m3 ) followed by Polyarthra dolichoptera (15356±9593.48 ind./m3 ) and Keratella cochlearis (11850±15441.51 ind./m3 ). In the study, the most common species belonging to Cladocera was Ceriodaphnia pulchella (7042±6759.93 ind./m3 ) and the most abundant copepod species was Cyclops vicinus (2553±1596.48 ind./m3 ).

Yıllık ortalama secchi disk derinliği (100,42 ± 38,99 cm), su sıcaklığı (21,06 ± 5,96 ºC), çözünmüş oksijen (8,33 ± 0,99 mg / l), nitrat (0,43 ± 0,19 mg / l), nitrit (0,02 ± 0,01), sertlik (172 ± 17,27 mg / l), silikat (1,17 ± 0,28 mg / l), fosfat (0,14 ± 0,03 mg / l), organik fosfat (1,09 ± 0,56 mg / l) ve klorofil-a (0,05 ± 0,03 mg / l) tespit edildi ve bu değerlere göre rezervuar suyunun ötrofik ve hiperneurofik karaktere sahip olduğu belirlendi. Rotifera 45 taksonla en yüksek orana sahipken, onu 11 tür ile Cladocera ve 7 tür ile Copepoda izledi. Bütün çalışma süresince Asplanchna priodonta, Keratella cochlearis, Polyarthra dolichoptera, Sychaeta stylata, Bosmina longirostris, Diaphanosoma birgei ve Disparalona rostrata mevcuttu. Rotifera'dan en bol bulunan tür Sychaeta stylata (26034 ± 56482,24 birey /m3 ) iken, bunu Polyarthra dolichoptera (15356 ± 9593,48 birey /m3 ) ve Keratella cochlearis (11850 ± 15441,51 birey/m3 ) takip etmiştir. Çalışmada Kladosera'ya ait en yaygın türün Ceriodaphnia pulchella (7042 ± 6759,93 birey /m3 ) ve Kopepoda’ya ait en bol türün ise Cyclops vicinus (2553 ± 1596,48 birey /m3 ) olduğu belirlenmiştir.