Ankara?nın farklı sucul alanlarında ostrakot (Crustacea) tür çeşitliliği ile çevresel değişkenler arasındaki ilişkinin belirlenmesinde kullanılan çeşitlilik hipotezlerinin karşılaştırmalı analizi

This study includes samples collected randomly from 173 different aquatic bodies from 17 counties of Ankara between 22 June and 03 July 2011. Total of 31 ostracod species were identified. When two of which (Eucypris elliptica and Cavernocypris subterranea) are new reports for the Turkish ostracod fauna, 19 taxa are new reports for Ankara region. Ecological correlation was evaluated by means of using multi-variable analyses between ostracod species and environmental variables. Canonical Correspondence Analyses (CCA) outlined 58.9 % of the correlation between species and environmental variables. Five variables (water temperature, humidity, dissolved oxygen, altitude, and atmospheric pressure) were found to be the most effective factors on species. Unweighted Paired Group Mean Analyses (UPGMA) illustrated four main clustering groups of ostracods attained in theirecological conditions. Generally, results showed that species with cosmopolitan characteristics had wide ecological tolerances for different variables. According to the Species-Area relationships, eight diversity hypotheses (passive sampling hypothesis (random placement hypothesis), island biogeography theory (area per se effect), habitat diversity hypotesis, sampling effect hypothesis, intermediate disturbance hypothesis, small island habitat hypothesis, target area hypothesis and species-energy hypothesis) were examined and compared with each other. Accordingly, results imply that habitat diversity hypothesis seems to be the most suitable hypothesis explaining ostracod distribution at different altitudinal ranges. However, results should not be generalized at the moment because of dominancy of sampling from troughs. Thus, future studies are urged to be clarify the situation.