Limnological Institute, SB RAS, Irkutsk
Tel: +7 (3952) 46 05 04
Fax:+7 (3952) 46 04 05
The ability of any ecosystem to meet various environmental challenges directly depends on its complexity, which includes not only species composition of its biota, but also genetic variability of the species. Therefore it is essential to develop an estimate which would take into account the both characteristics. Currently there are many different approaches to quantify species diversity, but estimates of genetic variability although widely used in population and evolutionary studies, still escape application at the ecosystem level. On the other hand, recent progress in technology of DNA sequencing made it possible to obtain sufficient amounts of data, which would allow taking into account genetic diversity while describing an ecosystem.
Thus in framework of current project we propose to collect both sets of data (species content and genetic diversity) for several different ecosystems concentrating at benthic invertebrate communities, obtain an information on their genetic diversity by amplifying and sequencing ca 600BP long fragment of mitochondrial gene Cox I and compare traditional numerical characteristics of an ecosystems based on species content only with several kinds of the new ones taking into account genetic diversity. By comparing the data obtained to the existing qualitative knowledge on the processes going on the model ecosystems we expect to estimate the usability of different methods of numerical descriptions of ecosystem and obtain more adequate tool for uniform description of biodiversity in different ecosystems.
At the Limnological Institute in course of molecular phylogenetic studies ca 700bp long fragment of mitochondrial gene coding for the first sub unit of cytochrom c oxydase have been successfully used to analyze evolutionary relationships within amphipods, 3 families of molluscs and oligochaets. Currently it is well accepted, that this fragment is usefull for evolutionary studies at different levels including the population one: in spite of relatively high evolutionary robustness of its amino acid composition, the accumulation rate of synonymous base substitutions, especially transitions, is still very high. Universal primers allow seemless inclusion of representatives of different animal groups into the same study, thus allowing comparison of the results, which already have been done in course of evolutionary studies.
On the other hand, considerable experience of taking of quantitative probes and analyzing species content and abundance there had been accumulated in course of detailed ecological studies of benthic communities at Lake Baikal.
Well established and wide network of international collaboration with different European laboratories of similar profile (Royal Belgian Institute of Natural Sciences, Drs. Goddeeris, Marens, Verheyen; Bulgarian Institute of Fisheries, Dr. Uzunova; the Helsinki University, Dr. Va inola and several other German, British and Dutch groups) will enable the analysis of different ecosystems ranging both by biodiversity and extent of human impact.
Therefore the program of the program of the study proposed (flow chart is given at Fig.1) will consist of the following major stages performed for at least two model communities at Lake Baikal and Black Sea:
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