Diatoms as indicators of hydrologic and climatic change in saline lakes

Sheri C. Fritz, Brian F. Cumming, Françoise Gasse, Kathleen R. Laird

Research output: Chapter in Book/Report/Conference proceedingChapter

50 Scopus citations

Abstract

Introduction Lakes are intricately tied to the climate system in that their water level and chemistry are a manifestation of the balance between inputs (precipitation, stream inflow, surface runoff, groundwater inflow) and outputs (evaporation, stream outflow, groundwater recharge) (Mason et al., 1994). Hence, changes in a lake’s hydrologic budget caused by climatic change have the potential to alter lake level and lake chemistry. These changes, in turn, may affect the physiological responses and species composition of the lake’s biota, including diatoms. Here we review the use of diatoms as indicators of hydrologic and climatic change, with an emphasis on environmental reconstruction in arid and semi-arid regions. First we discuss linkages among climate, hydrology, lake hydrochemistry, and diatoms that form the foundation for environmental reconstruction, and then we review selected examples of diatom-based studies. Lake hydrology and hydrochemistry Lakes vary in their hydrologic sensitivity to climatic change (Winter, 1990). In basins with a surface outlet, lake-level increase is constrained by topography, and any change in input is usually balanced by outflow. Thus, in open basins, lake level fluctuates relatively little, unless hydrologic change is sufficiently large to drop water level below the outlet level. In contrast, closed-basin lakes without surface outflow often show changes in level associated with changes in the balance between precipitation and evaporation (P – E).

Original languageEnglish (US)
Title of host publicationThe Diatoms
Subtitle of host publicationApplications for the Environmental and Earth Sciences, Second Edition
PublisherCambridge University Press
Pages186-208
Number of pages23
ISBN (Electronic)9780511763175
ISBN (Print)9780521509961
DOIs
StatePublished - Jan 1 2010

ASJC Scopus subject areas

  • General Agricultural and Biological Sciences

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