Structural Changes and Adaptation of Algal Population under Different Regimens of Toxic Exposure

Ipatova, V.I.; Prokhotskaya, V.Y.; Dmitrieva, A.G.

Авторы: Ipatova V.I., Prokhotskaya V.Yu, Dmitrieva A.G.
Сборник: Unifying Themes in Complex Systems VII. Proceedings of the Seventh International Conference on Complex Systems. Minai, Ali A.; Braha,Dan; Bar-Yam, Yaneer (Eds.)
Год издания: 2012
Место издания: Springer, ISBN 978-3-642-18002-6
Первая страница: 149
Последняя страница: 156
Аннотация: The present study is a simple model of algal adaptation to stressful environments. The changes of population structure of freshwater green alga Scenedesmus quadricauda (Turp.) Breb. and marine diatom alga Thalassiosira weissflogii (Grunow) Fryxell et Hastle were studied under different regimens of heavy metal (chromium) exposure. The main aims of this work were: (1) to estimate the effect of chromium contamination on microalgal populations under different regimens of chromium addition; (2) to determine the nature and origin of chromium-resistant cells that arise; (3) to estimate the mutation rate from chromium sensitivity to chromium resistance. Our results suggest that rare preselective mutants can be sufficient to ensure the adaptation of eukaryotic algae to extreme natural habitats. The resistant cells arise randomly by rare spontaneous mutation during replication of cells prior to the addition of the contaminant. Resistant mutants are maintained in the absence of contaminants as the result of balance between new resistant cells arising from spontaneous mutation and resistant cells eliminated by natural selection, so that about 3-5 chromium-resistant mutants per million cells are present in the absence of chromium. Adaptation of algal populations to modern pollution-derived environmental hazards seems to be the result of a rare instantaneous events and the result of resistant cells selection within heterogeneous population.
Добавил в систему: Ипатова Валентина Ивановна

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