Research on the relationship between water chemistry, sediment chemistry and carapace structure of non-marine ostracoda (crustacea) from Giresun (Turkey)

This study includes 105 different freshwater habitats were sampled from Giresun during 3-8 October 2015. Nine genera and 16 species were recorded from 69 of 105 sampling sites in Giresun. All species were new record for this province. Water and sediment samples from different aquatic habitat types were collected and analyzed to show possible relationship between abundance and effects on carapace structure of Ostracoda. Selected 17 carapace sample prepared for Energy Dispersive X-ray Analysis (EDX) and the percentages of the elements forming the carapace were determined. First two axes of Canonical Correspondence Analysis (CCA) revealed 69.5% of relationship between nine species and four environmental variables. Among variables, while water temperature (P<0.05) was the most effective variable, electrical conductivity, magnesium and nitrate were less effective variables. According to C2 analysis, Heterocypris salina has maximum optimum value for water temperature. Potamocypris fallax has minimum tolerance and optimum values for electrical conductivity. Sodium in the carapace structure of H. salina was found higher than other edx samples. There was no clear evidence of relationship between calcium concentrations at water and carapace. This finding suggets that major source of calcium in carapace was sediment through water.