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Observations on the Evolution and Classification of Dysaerobic Communities

Published online by Cambridge University Press:  26 July 2017

Paul B. Wignall
Paul B. Wignall*
Affiliation:
Department of Geology, University Road, Leicester University, England LE1 7RH
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Extract

The term dysaerobic was first coined by Rhoads and Morse (1971) to define conditions in which oxygen levels ranged between 1.0 and 0.1 mL of oxygen/litre of water. Such low oxygen tensions were thought to exclude all but soft-bodied invertebrates with the absence of shelly fossils being one of the diagnostic features of the dysaerobic zone. Subsequent observations of recent dysaerobic environments has revealed that shelly invertebrates can survive in oxygen values as low as 0.3 mL/L (e.g. Savrda, Bottjer and Gorsline, 1984). Consequently the dysaerobic zone is now used in the more qualitative sense to denote conditions in which oxygen levels are sufficiently low to cause a notable change in the fauna (Kammer and others, 1986; Wignall and Myers, 1988). Faunal abundance and diversity is reduced under low oxygen conditions compared to more normally oxygenated (aerobic) biofacies.

Type
Research Article
Information
The Paleontological Society Special Publications , Volume 5: Paleocommunity Temporal Dynamics: The Long-Term Development of Multispecies Assemblies , 1990 , pp. 99 - 111
Copyright
Copyright © 1990 Paleontological Society 

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