Известия высших учебных заведений. Поволжский регион: Естественные науки (Oct 2022)
The effect of environmental pollution on Pelophylax ridibundus (Pallas, 1771) morphometric and biochemical parameters
Abstract
Background. The growth of anthropogenic pressure on water bodies due to the expansion of agglomerations contributes to the reduction in the abundance of both rare and widespread amphibian species. We studied the features of Pelophylax ridibundus adaptations living in urban water bodies to anthropogenic pollution based on the study of a number of morphometric and biochemical parameters. Materials and methods. For the study, three reservoirs were used on the territory of the city of Makhachkala with varying degrees of pollution, based on the calculation of the coefficient of complexity of environmental pollution. In mature P. ridibundus, after spawning, morphometric measurements were taken, body weight was measured, linear indices were calculated, and the content of total protein, cholesterol in tissues, and blood glucose was determined. Results. In the course of studying the morphometric parameters of P. ridibundus in a polluted environment, a decrease in the morphometric parameters of the body, the presence of size-weight sexual dimorphism, and an increase in the size of the head and limbs in females were noted. Correlation analysis showed the presence of a negative correlation in females between the L/L.c. and F/T indices from polluted water bodies and a positive correlation from a water body with a low degree of pollution. In males, only a positive correlation was noted. According to the factor analysis of variance, it was revealed that environmental pollution affects the decrease in body weight, cholesterol and glucose levels, as well as an increase in the total protein content in P. ridibundus tissues (R2 ≥ 53 %, p ≤ 0.05). Some parameters are also affected by gender, as well as the interaction of two factors. Conclusions. The population variability of body weight and biochemical parameters in P. ridibundus is largely due to environmental pollution, while the variability of morphometric parameters both within and between populations is due to a complex of factors, where the degree of environmental pollution affects to a lesser extent.
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