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By Maik Ònauka

Abstract

The biological characteristics of amphibians, which develop in water (outside the mother’s organism) since fertilization, determine their considerable dependence on environmental conditions. Animals with various morphological abnormalities are common in amphib-ian populations (Borkin and Pikulik, 1986; Hebard and Brunson, 1963; Talvi, 1993). The abnormalities are often induced by byproducts of human activities, such as various pollutants. All abnormalities may be divided into two main groups: hereditary and acquired. The lat-ter develop in the course of regeneration or ontogeny. The abnormalities resulting from developmental distur-bances and atypical regeneration are largely deter-mined by pollutant-induced inhibition or activation of the thyroid function. This leads to the suppression of proliferation and morphogenesis during larval develop-ment and organ regeneration (Syuzyumova, 1985) and affects the metabolic rate (Tokar’ et al

Year: 1067
OAI identifier: oai:CiteSeerX.psu:10.1.1.1006.3559
Provided by: CiteSeerX
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