Düzce ve Karabük (Türkiye) bölgesindeki ostrakoda (Crustacea) çeşitliliğinin karşılaştırmalı analizi ve ekolojik özelliklerinin belirlenmesi

During this study, 36 ostracod taxa (22 living and 14 sub-recent) were randomly collected with 4155 individuals from 81 sites in Karabük region (4,145 km2) in26 – 28 July 2012. All taxa are new reports for the region. First two axes of Canonical Correspondence Analysis (CCA) displayed 73.4% of the total inertia (6.245) of the relationship between species and environmental variables. Among the species, Heterocypris incongruens, H. salina, Ilyocypris bradyi and Psychrodromus olivaceus were found as the most frequently occurring species. When H. incongruens showed relatively higher optimum and tolerance values more than the mean values of 14 species analyzed, others showed species-specific tolerance and optimum levels. Majority of the species were mostly found from 50 troughs followed by stream, ditch, springs, ponds, lake and cave water. Results suggest that although troughs are artificial, they can provide suitable habitats for ostracods. However, converting natural water sources to troughs will eventually lower the species quality and diversity. In contrast, total of 30 ostracod taxa (19 living and 11 sub-recent) with 2738 individuals were randomly collected from 81 sites in Düzce region (2573 km²) in21-24 September, 2012. out of the individuals collected 16 species are new reports for Düzce region. First two axes of Canonical Correspondence Analysis (CCA) displayed 74% of the total inertia (5.488) for the relationship between species and environmental variables. Among the species H.salina, I.bradyi, C.neglecta, P.olivaceus were found as the most frequently occurring species when the last three species were also common in Karabük. During comparative analyses, two critical hypotheses were tested which includes: (i) numbers of species are equally distributed at the same altitudinal ranges in Düzce and Karabük that altitude alone does not effect species distribution, and (ii) no difference found in the means numbers of species between the two regions. Results showed that there was no significant difference(means numbers of species between two region) in the diversity and change in the numbers of species within the corresponding altitudinal ranges.