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Contemporary Problems of Ecology

2010 year, number 5

Relations of Baikal and Palaearctic Amphipoda with Oxygen as an Environmental Factor and the Mechanisms of Adaptation to a Decrease in its Level

M. A. Timofeyev, K. A. Kirichenko, Z. M. Shatilina, A. V. Rokhin, T. P. Pobezhimova
Keywords: amphipoda, Baikal, hypoxia, oxygen, anаerobic lipolysis, succinate, Eulimnogammarus vittatus, Eulimnogammarus cyaneus, Gammarus lacustris
Pages: 717-724

Abstract

Materials of the comparative investigation of the features of the use of anaerobic mechanisms by Baikal amphipoda Eulimnogammarus vittatus (Dyb.), E. cyaneus (Dyb.), and Palaearctic Gammarus lacustris Sars. under the conditions of decreased oxygen content. It is shown that the anaerobic metabolism system functions with the highest efficiency in the Palaearctic species G. lacustris. This species is characterized by the lowest degree of the use of a low-efficiency route of energy formation - anaerobic lipolysis - and the highest degree of the use of a more efficient route of energy formation under the conditions of the low oxygen content - anaerobic formation of succinate. For Baikal species that are less stable against the action of reduced oxygen content, a more clearly pronounced induction of anaerobic lipolysis and a lower degree of involvement of the anaerobic formation of succinate were demonstrated.