Application of Fluctuating Asymmetry Values in Pelophylax ridibundus (Amphibia: Anura: Ranidae) Meristic Traits as a Method for Assessing Environmental Quality of Areas with Different Degrees of Urbanization

In this paper, we assess the environmental impact of urbanization in three freshwater biotopes, using levels fluctuating asymmetry (FA) 10 meristic morphological traits Marsh Frog (Pelophylax ridibundus (Pallas, 1771)). Two studied biotopes are located boundaries city Plovdiv (one central part, other a suburban residential area), and third is vicinity village Orizare. Our working hypothesis based on assumption that urban sites more severely affected by human activities than rural sites. However, according to our results, population P. inhabiting Maritsa River part City, zone, have found relatively good living conditions. Contrary expectations, worst conditions were observed where anthropogenic stress related intensive pastoral animal husbandry crop farming was present. The absence adult individuals site also an indicator unfavorable