Инд. авторы:	Krivonogov S.K., Yamamuro M., Takahara H., Kazansky A.Y., Klimin M.A., Bobrov V.A., Safonova I.Y., Phedorin M.A., Bortnikova S.B.
Заглавие:	An abrupt ecosystem change in Lake Beloye, southern Western Siberia: Palaeoclimate versus local environment
Библ. ссылка:	Krivonogov S.K., Yamamuro M., Takahara H., Kazansky A.Y., Klimin M.A., Bobrov V.A., Safonova I.Y., Phedorin M.A., Bortnikova S.B. An abrupt ecosystem change in Lake Beloye, southern Western Siberia: Palaeoclimate versus local environment // Palaeogeography, Palaeoclimatology, Palaeoecology. - 2012. - Vol.331-332. - P.194-206. - ISSN 0031-0182.
Внешние системы:	DOI: 10.1016/j.palaeo.2012.02.030; SCOPUS: 2-s2.0-84859838955;
Реферат:	eng: Sediment structure, rock-magnetic and bio-geochemical records obtained from sapropel core samples in Lake Beloye, southern Western Siberia, indicate an abrupt ecosystem change at 3.4 calibrated ka BP. The lake changed from eutrophic to oligotrophic, its vegetation - from carbon-fixing macrophytic angiosperms to calcium-fixing macrophytic algae and angiosperms, and, as a result, the type of sedimentation shifted from peaty sapropel to carbonate-rich sapropel. Those changes could be induced by climate, which was warmer and wetter before 3.4ka BP and cooler and drier after this. Nevertheless, our data show that those ecosystem changes occurred when the lake became shallower to get about 1m depth and started to freeze to the bottom in winter time. The full freezing of the lake led to the deposition of carbonates, which resulted in: i) death of carbon-utilizing macrophytic angiosperms; and ii) winter precipitation of calcium carbonate. In summer, additional portions of Ca 2+ and HCO 3 - ions come into the lake from the surrounding CaCO 3 rich loess sediments with ground water. The Beloye Lake thus represents an example of interrelated regional climatic and local ecological factors, which combination resulted in the 3.4cal. ka BP dramatic change of its ecosystem. © 2012 Elsevier B.V.
Ключевые слова:	algae; Siberia; Russian Federation; Novosibirsk; Lake Beloye; sedimentation rate; sediment core; sapropel; precipitation (chemistry); paleoecology; paleoclimate; macrophyte; loess; Magnoliophyta; Holocene; ecosystem dynamics; biogeochemistry; alga; Western Siberia; Small lakes; Sedimentology; Rock magnetics; Holocene; Geochemistry; Environmental changes; Biochemistry; lacustrine deposit;
Издано:	2012
Физ. характеристика:	с.194-206