DIATOM ASSEMBLAGES AND IONIC CHARACTERIZATION OF LAKES OF THE NORTHERN GREAT-PLAINS, NORTH-AMERICA - A TOOL FOR RECONSTRUCTING PAST SALINITY AND CLIMATE FLUCTUATIONS

被引：151

作者：

FRITZ, SC ^{[1
]}

JUGGINS, S ^{[1
]}

BATTARBEE, RW ^{[1
]}

机构：

[1] UCL, DEPT GEOG, ENVIRONM CHANGE RES CTR, LONDON WC1H 0AP, ENGLAND

来源：

CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES | 1993年 / 50卷 / 09期

关键词：

D O I：

10.1139/f93-207

中图分类号：

S9 [水产、渔业];

学科分类号：

0908 ;

摘要：

The distribution of diatoms with respect to salinity and ionic gradients was studied in lakes of the northern Great Plains of North America. The lakes range from freshwater to hypersaline (0.65-270 g.L(-1)) and include a variety of brine types, although the majority are dominated by sulfate salts. Canonical correspondence analysis of diatoms in the surface sediments of 66 lakes and associated water chemistry data indicates that diatom distributions are highly correlated with salinity. The ordination also suggests that brine type forms a significant environmental gradient and separates taxa characteristic of bicarbonate/carbonate lakes from those of sulfate-dominated systems. The salinity optima and tolerances of diatom species are calculated by weighted averaging regression, and these data provide a tool for the reconstruction of past salinity and the inferance of climatic change in arid and semiarid regions.

引用

页码：1844 / 1856

页数：13

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