title: [Interpopulation comparison of variations in gastrulation of Rana arvalis and Rana ridibunda occurring under the conditions of anthropogenic contamination of water bodies].
abstract: The results of morphometric analysis of gastrulation in city populations of Rana arvalis and Rana ridibunda suggest that under the conditions of anthropogenic contamination of water bodies, the early development is more variable, if we compare less variable sizes of their eggs in the city and suburb populations. The variability of gastrulation appears to depend on the degree of contamination of spawning water bodies and is accompanied by increased correlation between the forming structures. This latter may be determined by two causes: (1) increased number of interdependent features, which leads to coordinated differentiation of structures and regulation of variability, and (2) increased coefficients of correlation within a small group of features, which leads to the formation of structures characteristic for the subsequent developmental stages, including the appearance of heterochronies.
authors.forename: E A
authors.initials: EA
authors.lastname: Severtsova
authors.forename: A S
authors.initials: AS
authors.lastname: Severtsov
mesh_terms: D000818:Animals; D047108:Embryonic Development / Q000187:drug effects* / Q000235:genetics; D004784:Environmental Monitoring / Q000379:methods*; D005775:Gastrula / Q000187:drug effects*; D014644:Genetic Variation / Q000187:drug effects*; D007814:Larva / Q000187:drug effects; D011895:Rana ridibunda / Q000196:embryology; D011898:Ranidae / Q000196:embryology*; D012426:Russia; D013045:Species Specificity; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D014874:Water Pollutants, Chemical