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Интеллектуальная Система Тематического Исследования НАукометрических данных |
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The influence of the Caspian’s Sea level dynamics on the marine ecosystems stabilityтезисы доклада
- Авторы: Mitina N.N., Malashenkow B.M.
- Сборник: Int. Conference BALWOIS-2012.Ohrid, FY Republic of Macedonia
- Том: 25
- Тезисы
- Год издания: 2012
- Место издания: Ohrid, FY Republic of Macedonia
- Первая страница: 794
- Последняя страница: 802
- Аннотация: Among the most important influences on the stable ecological state of the Caspian Sea is its levelchanging. During the regular instrumental observations which have been conducted since 1837 the level of the Caspian Sea has been subject to significant fluctuations. The highest water level was recorded in 1882 (-25.2 m), the lowest - in 1977 (-29.0 m). The water level rose since 1978 and in 1995 he reached the mark -26.7 m, since 1996 there is a tendency to decrease, which lasted until 1998, when the Caspian Sea level was dropped to -27.17 m. [Frolov, 2003]. From 1999 to 2005 oscillatory trend motion with the total level of a slight increase up to the mark - 26.8 m. The aim of this study is to establish the dependence of the impact of changes in the Caspian Sea level on the benthos community characteristics and aquatic ecosystems biodiversity. In order to understand the degree of influence of anthropogenic factors on the ecosystem of the Caspian Sea, to study its dynamics and the stabilizing role of individual components, we have compiled a database in which we collected the average annual values of climatic, hydrological, hydrochemical and biological data indicators of the region's natural environment and the characteristics of the various anthropogenic actions in the period from 1878 to 2007. After that we use simple statistical methods - calculation of pair correlation coefficients (r) to analyzed data .Data matrix analysis from 1935 to 2005 showed that the dependences of the sea level and various forms of benthic items that are valuable commercially fish species. It was found, for example, that the zoobenthos biomass dynamics trend associated with the Caspian Sea level dynamics and closely antiphase with him during 1935-2005.Caspian Sea level rose during the period of 1935-1990 and in the same period the benthos biomass decreased both in the eastern and western regions of the Northern Caspian Sea. There was some benthic biomass increase (to 49.9 g/m2) in 2000 but after 2001 it was a sharp downturn. In 2006, the zoobenthos biomass was only 8.2g/m2, which is comparable with the data of the late 1930. For thermore, the dependences of the biomass of forage benthos forms and quantity of valuable herds of commercial fish species. We can say tentatively that the condition of the herd of commercial fish species depends on the forage base of the reservoir in the first place.
- Добавил в систему: Митина Наталья Николаевна
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | 770-298-1-DR.pdf | 770-298-1-DR.pdf | 1,5 МБ | 7 декабря 2012 [MalashenkowBM] |