DSpace community: 2007

The monitoring of zooplankton biodiversity changes in the Black Sea in front of Georgia

Sun, 29 Oct 2006 22:58:59 GMT

title: The monitoring of zooplankton biodiversity changes in the Black Sea in front of Georgia authors: Khalvashi, M. S.; Makharadze, G. M.; Takidze, I. D.

Первое нахождение у крымского побережья нового для Чёрного моря вида Pachycordyle napolitana Weismann, 1883 (Hydrozoa: Hydroidomedusae: Anthmedusae: Clavidae)

Sun, 29 Oct 2006 22:58:59 GMT

title: Первое нахождение у крымского побережья нового для Чёрного моря вида Pachycordyle napolitana Weismann, 1883 (Hydrozoa: Hydroidomedusae: Anthmedusae: Clavidae) authors: Мурина, В. В.; Гринцов, В. А.

Methane emission to the hydro- and atmosphere by gas bubble streams in the Dnieper paleo-delta, the Black Sea

Sun, 29 Oct 2006 22:58:59 GMT

title: Methane emission to the hydro- and atmosphere by gas bubble streams in the Dnieper paleo-delta, the Black Sea authors: Artemov, Yu. G.; Egorov, V. N.; Polikarpov, G. G.; Gulin, S. B.
abstract: To estimate methane flux from natural gas bubble streams (seepages) a combined approach was applied, inclusive of detailed echo survey of investigated area and data analysis with the use of specialized software, GIS technique and mathematic simulation. A precise location map of methane seepages in the Dnieper paleo-delta region was obtained. In total 2200 seepages were identified at the investigated area of 378.1 sq.km, which release 16.74 106 m³ at atmospheric pressure (STP), or 12.0 10-3 teragram (Tg) methane a year. Statistical distribution of individual seepage methane flux rates conforms to the lognormal law. We found that 1.9 % of methane from gas bubble streams reaches the atmosphere in gas phase, while 98.1 % dissolves in the water column. Thus, the most part of methane remains in sea water and enters into physical, chemical and biological transformation processes of carbon-containing compounds.

Устойчивость экосистем

Sun, 29 Oct 2006 22:58:59 GMT

title: Устойчивость экосистем authors: Заика, В.Е.
abstract: В аналитическом обзоре обсуждаются вопросы смены аспектов и подходов к проблеме устойчивости экосистем и сообществ за последние десятилетия. Рассмотрены вопросы определения устойчивости, аспекты и показатели устойчивости, различия в подходах к сообществам и экосистемам, связь устойчивости со структурой системы, практическая сторона экологической устойчивости.