Institut für Biologie der Martin-Luther-Universität Halle-Wittenberg
Date of this Version
2012
Document Type
Article
Citation
Erforschung biologischer Ressourcen der Mongolei (2012) band 12: 219-230.
Abstract
The studies in recent years (2000-2011) have allowed to make more precise the list and ranges of Mongolian fish. This is connected with new findings as well as the continuing process of invasion of alien species. Climate change and increase of human impact transformed ranges and local distribution of fish during last 30 years. Bias on ratio of ecological guilds, number of pathological findings are increasing, and declining of local diversity, rate of growth and fecundity of many species of fish are observed. In the course of long-term observation was confirmed periodically drying of waters of the Central Asian Lake Valley and temporal extinction of some populations of Altai osmans (genus Oreoleuciscus). The gold mining as a main anthropogenic factor in rivers of Arctic Ocean basin cause substantial silting of the grounds, increase of water turbidity, the lowering of flow velocity and heterogeneity of environment at separate sections led to a drastic fall in number of such species as taimen, lenok, grayling, minnows, burbot and to a growth of populations of the species adapting to new environments (golden carp, dace). Construction of hydraulic structures (dams in the basins of the Kobdo and Dzabkhan rivers), increase of pollutions, and intensification of fishery are new challenges for Mongolian fish populations.
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Comments
Copyright 2012, Martin-Luther-Universität Halle Wittenberg, Halle (Saale). Used by permission.