This study aims to determine the bacterial flora on the skin surface of the juvenile forms of Pelophylax ridibundus inhabiting three different altitudes and examine potential correlations between bacterial diversity, ecological location, and factors. It was attempted to characterize thirty-two bacteria isolated from the Melet River, Sülük Lake, and Çambaşı Pond through combined biochemical and molecular methods. Canonical correspondence analysis showed that the most important ecological factors for microorganisms to settle on frog skin were determined as water conductivity and dissolved oxygen amount. The most frequently isolated bacteria belonged to the genera Erwinia and Pseudomonas. Altitude positively affected Exiguobacterium. This first report of skin cultivable bacteria from P. ridibundus juvenile forms natural population improves our knowledge of amphibian skin bacterial flora. This study contributes to a better understanding of their ecology and how this species has survived in an environment modulated by altitude.

Faculty of Education Science Education Department Ordu University Ordu Turkey

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