Journal Article

Journal article

PALLAS  [2014]

Baytimirova Ekaterina Vershinin Vladimir Institute of Plant and Animal Ecology, Ural Branch of the Russian Academy of Sciences [Corporate Author]

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The effect of endocrine disruptors lead to sexual development deviations and to the appearance of intersexual individuals. The increase of the number of intersexual frogs became one of the results of hormone disruptors influence on amphibians. At the same time fact about the presence of oocytes in the issues of testis is prevailing in literature. No doubt that the connections between intersexuality and fertility of sexually mature frogs needs more investigation. One of the main indicators of impregnating ability of spermatozoa is the head size. Sexually mature marsh frog males (Pelophylax ridibundus), caught in three habitats with different level of anthropogenous loading were investigated in this work. Spermatozoa heads area measurement is carried out both on the smear preparations, and on histologic preparations of a seed plant by means of the ImageJ program. A microscopic research concerning the presence of oocytes at seed plants’ tissue was carried out on serial cuts of animal seed plants. The abnormal spermatozoa quantity does not exceed 7%. The minimum head area is noted around the hermaphroditic individual capture place. The spermatozoa heads area of the hermaphrodite is smaller than the one of normal males. Research of the oocytes presence in seed plant tissue showed its’ existence only in tissue of the hermaphrodite seed plant. It is possible to refer the spermatozoa head size of a marsh frog to parameters rather sensitive to adverse effects unlik
e the quantity of spermatozoa. And one of probable causes of a marsh frog hermaphroditic individual emergence in the area of Yekaterinburg city, is the pollution of a spawning reservoir by the easily oxidized organic substances with hormon properties.

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ISSN : 2072-0831