Distribution and interrelation of community of hydrobionts in the water-basin having areas of naturally different trophity ( on the example of the Chivirkui Bay of Lake Baikal )

Institute of General and Experimental Biology, SB RAS, Ulan-Ude

Head of the Institute:

Vladimir M.Korsunov, Doctor of Biological Sciences, Professor
6 Sakhyanovoi Str., Ulan-Ude, 670047, Russia
Tel. (3012) 331211, Fax: (3012) 330134,
email: ioeb@bsc.buriatia.ru

Principal researchers:

N.M.Pronin, Ph.D. (Biology),
Head of the Laboratory of Parasitology and Ecology of Hydrobionths
B.B.Namsaraev, Doctor of Sciences (Biology),
Head of the Laboratory of Microbiology
A.V.Sokolov, Ph.D. (Biology),
deputy director of the Eastern-Siberian Centre of Fishery

Project objectives

Background and significance of objectives

There are considerable data on comparative research of hydrobiological characteristics of water-basins of different trophic type and of the influence of different factors on processes of eutrophication in ecology. Chivirkui Bay is a super-unique water-basin due to the existence of natural areas of different trophity. A natural change of the trophic type of water-body: eutrophic – mesotrophic – oligotrophic – ultraoligotrophic along with the longitudinal profile of the Bay with changing of its depth from 4 m to 100 m is noted. Gradual alternation of the fauna: from Siberian to Baikal-Siberian and to endemic Baikalian one is marked. There is a large number of relatively isolated gulfs with peculiar temperature conditions. The Bay is tied with the large Lake Arangatui situated on the isthmus by a little river. There is a number of small lakes with reduced fauna on the isthmus. Chivirkui Bay of Lake Baikal is entirely part of the territory of Zabaikal’skii National Natural Park, 40 km away from the village of Ust-Barguzin, 5 km away from the pier of fishermen’s village of Kurbulik (see Fig. 1). Chivirkui Bay is the most cutting into the mainland and relatively isolated one among other Baikal bays, with numerous unique gulfs (see Fig. 2).

At present, there are very interesting, but isolated or fragmentary data on some taxonomic or ecological groups of hydrobionts. The diversity and activity of micro-organisms of water and bottom precipitation of Chivirkui Bay have not yet been researched. Fragmentary investigations of any physiological groups of micro-organisms give no idea about their role in the action of the lake ecosystem. The changes of environmental conditions from shallow-water to deep-water give the possibility of comparative research into the biogeochemical activity of micro-organisms.

A. Ya.Bazikalova (1945) established a varying distribution of gammarids along the profile of the Bay and in its gulfs. The poorest composition of gammarid fauna is typical of the southern shallow-water part of the Bay (Pronin et al., 1986). The diversity of fauna is increasing in the part near the open Baikal. However, the spatial distribution of abundance and biomass of this group of the benthos has another pattern. The distribution of zooplankton is uneven, too. Its abundance in June in central and south-eastern parts of the Bay does not exceed 80000 spesies/m3. In the northern and south-western part the abundance of zooplankton was less than 40000 spesies /m3 (Sokolnikov, 1994). Different directions of seasonal abundance of zooplankton in the other part of the Bay (from 40 to 160000 spesies/m3) demand deeper research of regularities of its distribution in time and space.

Among the fish of the Bay, there are coinciding species in eutrophic, mesotrophic, oligotrophic and ultraoligotrophic areas and in different parts of water-basin. The structure of parasitocoenosis is determined by the environment and interrelations between parasites and hosts. The parasite species composition of fish integrates its trophic and topic connections. The comparison of community of parasites of hydrobionths arranged into areas of appointed trophity allows one to reveal physiological and ecological factors that determined parasite species diversity.

Especially interesting information may be obtained from comparative analysis of fauna of blood parasites of fish in different faunistical complexes.

At the first stage the research of the following taxonomic and ecological groups is supposed to be conducted:

Research plan: approaches and methods

General hydrobiological survey of the open part of Chivirkui Bay, its gulfs and Lake Arangatui will be made and general quality hydrobiological features will be estimated. Basing on the results of a general hydrobiological survey, constant transection of stations along the central axis and series of station on the longitudinal hemiprofile in the littoral of the different part of the bay (eutrophic, mesotrophic, oligotrophic) will be established for the periodical survey.

All materials will be sampling and processed according the wide-accepting methods. Specific diversity will be defined by Shannon`s index (Megarran, 1992). Spatial distribution will be described by mapping of aquatoria. Diversity of microorganisms will be described by microscopic, cultural, physiological, molecular-genetic and serological methods. The activity of microorganisms will be determined by fermentative, radio-izotope and chemical methods. The composition of parasites will be determined by method of I.E.Bykhovskaya-Pavlovskaya (1985). Monitoring of the state of the fisheries resources in the aquatoria of the National Parks of Lake Baikal will be based on the population approach of determination of the abundance of local fish populations in Chivirkui Bay (the method of area, hydroacoustic survey, modelling). The main biological indices of fish will be characterised on the basis of materials of trawling surveys.

Expected results

Will be presented:

List of publications of participants related to the project

 

Fig. 1. Transbaikalian National Park on Lake Baikal, Buryatia.

 

Fig. 2. Isthmus of the Svyatoj Nos peninsula and adjacent surroundings, Lake Baikal, Transbaikal National Park on Lake Baikal, Buryatia.