Seasonal variation of the Malascostraca (Crustacea) fauna and their relationship with physicochemical parameters in Seyhan Basin, Türkiye
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The objective of this study was to investigate the seasonal distribution of Malacostraca fauna in the Seyhan Basin by examining their relationship with physicochemical parameters. Field studies were conducted at 23 stations during the spring, summer, and autumn of 2019, resulting in the examination of 4302 individuals. The orders Amphipoda and Decapoda were represented by 5 families (Niphargidae, Gammaridae, Palemonidae, and Potamidae) and 10 species. Echinogammarus ischnus, Gammarus mladeni, and G. pseudanatoliensis are the first recorded species in this basin. The Shannon-Wiener diversity (H) index showed that the highest diversity was at station 11th in the spring (0.72), at station 22nd (0.66) in the summer and autumn, and the lowest diversity was recorded at station 3rd in the spring (0.22) and autumn (0.05), and at station 1st in the summer (0.17). Based on Shannon Evenness (E), the most balanced distribution was observed at station 22nd during the spring and summer seasons (0.97), and at station 1st during the autumn season (0.96). The least homogeneous stations were identified as station 3 during the spring (0.22) and autumn (0.53) seasons, and station 1 during the summer season (0.59). Based on the results of the clustering analysis, the 3rd and 5th stations showed the highest similarity (89%), while the 2nd station was the least similar, separating from all other stations. The Pearson correlation analysis revealed a significant negative correlation between DO and temperature and total nitrogen and a significant positive correlation between temperature and EC (P<0.01). When examining the water quality classes of the stations according to the Water Quality Regulation criteria, it is observed that the stations have either 1st class (very clean) or 2nd class (moderately polluted) water quality.
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