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Zhelev Z.M.,Plovdiv University | Popgeorgiev G.S.,Regional Natural History Museum of Plovdiv | Georgieva Z.K.,Basin Direc. Plovdiv
Acta Zoologica Bulgarica | Year: 2014

Levels of fluctuating asymmetry in two species of anuran amphibians, Pelophylax ridibundus and Pseudepidalea viridis, in sympatric and syntopic conditions at the dam lake "Studen Kladenets" located next to the Lead and Zinc Plant "Kardzhali", South Bulgaria, are studied. Materials were collected during the breeding season in three consecutive years. Based on the indicators of fluctuating asymmetry in both species, grades characterizing the developmental stability of their populations are identified. These grades are indicative for the quality of the environment and are used for assessment of the biotope, carried out parallel and independently from the physicochemical analysis. Source


Zhelev Z.,Plovdiv University | Popgeorgiev G.,Regional Natural History Museum of Plovdiv | Georgieva Z.,Basin Directorate Plovdiv
Acta Zoologica Bulgarica | Year: 2013

In the present work we did a bio-indicational assessment of the ecological status of the river Sazliyka (Southern Bulgaria) and two of its left tributaries (the rivers Blatnitsa and Sokolitsa), based on the integral indicator for the developmental stability - fluctuating asymmetry (FA) in the populations of the marsh frog Pelophylax ridibundus. Seven biotopes upstream to the mouth of the Sazliyka River, and one and four biotopes along the rivers Blatnisa and Skokolitsa, respectively, were examined. Based on the indicators for FA, grade rating was assigned, and it was also done as a characteristic of the living environment in these biotopes, parallel and independently of the data from the physicochemical analysis. Source


Zhelev Z.M.,Plovdiv University | Popgeorgiev G.S.,Regional Natural History Museum of Plovdiv | Angelov M.V.,Basin Directorate Plovdiv
Acta Zoologica Bulgarica | Year: 2013

The current research examines some of the basic morphological hematological indicators (erythrocyte count, leukocyte count, hemoglobin, differential blood formula) in adult, fertile species within a population of the marsh frog Pelophylax ridibundus, inhabiting two heavily polluted rivers in Bulgaria. One of the two rivers is Sazliika River, which is polluted with nitrates, phosphates, biological oxygen demand in five days and insoluble substances, and the other one is Topolnica River, polluted with heavy metals. The paper explores the use of these indicators as biological markers for the quality of the environment in the two rivers. Statistically significant differences were found between the examined parameters in the two rivers and the control group. The living in toxic conditions resulted in a single type change in the blood toxicology (increased erythrocyte count and amount of hemoglobin). The changes in the differential blood formula differ considerably - the samples from Sazliika exhibit adaptive characteristics (neutrophilia, monocytosis and lymphopenia in general leukocytosis), whereas the samples from Topolnica showed lymphopenia accompanied with neutropenia and monocytosisin general leukocytosis. This is an evidence of the degenerative effects of toxicity. Source


Zhelev Z.,Plovdiv University | Arnaudov A.,Plovdiv University | Popgeorgiev G.,Regional Natural History Museum of Plovdiv | Dimitrov H.,Plovdiv University
Acta Zoologica Bulgarica | Year: 2012

The degree of manifestation of the indicators of fluctuating asymmetry (FA) was studied in the populations of Rana ridibunda in two of the most polluted river ecosystems in Southern Bulgaria. The integral indicator of developmental stability, evaluation of the ecological condition parallel to the data of physicochemical analysis was performed. It was found that the variations in genetic homeostasis in the populations of R. ridibunda in a habitat under conditions of anthropogenic pollution occur independently on the type of toxicants, but the degree of violation expression in the form of FA depends on the nature of the pollution. Source

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