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Contemporary Problems of Ecology

2003 year, number 5

Oxidative Influence of Solutions of Humic Substances on European and Baikalian Amphipods; an Evolutionary View on the Causes of Differences in Resistance

M. A. TIMOFEYEV, Z. M. SHATILINA, A.V. KOLESNICHENKO, T. P. POBEZHIMOVA, O. I. GRABELNIH
Pages: 569–574

Abstract

The goal of this work was to study the resistance of three amphipod species to the influence of humus substances solutions. European species G.tigrinus and C.ischnus, from Lake Mugulsee (Germay), and also species E.cyaneus, from Lake Baikal, (Russia) were used in the experiments. Amphipods were exposed to solutions of humic substance, whereupon the level of peroxidase activity was measured; for E.cyaneus, the level of lipid peroxidation was estimated. The experiments showed that the exposure of amphipods to solutions of humus substances caused death of European species, and increased the peroxidase activity level in all the species. Lipid peroxidation level increased also in E.cyaneus. This means an increase of production of reactive oxygen forms. The highest resistance to the influence of humus substances was shown by the Baikalian endemic E.cyaneus. A hypothesis of evolutionary causes of the high resistance of the Baikalian species is put forward.