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Applications of freshwater diatoms to geographical researchDepartment of Geography, McMaster University, Hamilton, Ontario L8S 1Y8, Canada
Department of Geography, UCLA, 405 Hilgard Ave., Los Angeles, CA 90024-1524, USA
Paleoecological Environmental Assessment and Research Laboratory (PEARL), Department of Biology, Queen's University, Kingston, Ontario K7L 3N6, Canada Diatoms (Bacillariophyceae) are a widely distributed group of microscopic, unicellular algae that are characterized by siliceous cell walls (frustules). The size, shape and sculpturing of diatom frustules are taxonomically diagnostic. Moreover, because of their siliceous composition, diatoms are often well preserved in stratigraphic deposits, where they can be used to infer (quantitatively or qualitatively) past environmental conditions. The sensitivity of diatoms to a wide variety of environmental variables provides geographers with a multitude of research opportunities. This review focuses on palaeoecological reconstructions that are based on freshwater diatoms. Geographical applications including studies of climatology, hydrology, geomorphology, bio geography, and water-quality assessment and monitoring are discussed.
Key Words: diatoms environmental change climatic change hydrology water quality palaeolimnology.
Progress in Physical Geography, Vol. 20, No. 1,
21-52 (1996) |
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