A population-phenogenetic analysis of plants (European white birch) based on investigation of the stability of their development in natural populations was performed. The data obtained allow character izing the violation of the stability in natural populations as a response of developing organisms to environ mental (climate) changes not only in the reclamation of new high altitude areas, but during temperature increases in plains as well.Keywords: stability of development, European white birch, climate change, population-phenogenetic anal ysis, ecological periphery of an area.

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Summary Here we describe the results of a preliminary study to evaluate the response of the cellular skeleton of the large African barb, Labeobarbus intermedius, to exposure to high levels of the thyroid hormone T3 for 1 and 3 months. We examined the effects in terms of mineral density and mechanical properties of the operculum bone, as well as evaluated and compared the light microscopy features of this bone between the treatment groups and the untreated control group. We found a significant increase in bone mineral density in the treated groups compared to untreated controls, and a tendency towards a corresponding increase of bone material stiffness (Young's modulus). These findings suggest that thyroid hormone enrichment may contribute to improved skeletal properties in pond‐raised fish, and help moderate osteomalacia, a commonly seen problem in aquaculture.

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