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Diatom preservation: differential preservation of sedimentary diatoms in two saline lakes

Roger J. Flower ; Environmental Change Research Centre, Department of Geography, University College London, Gower Street, London WC1E 6BT, UK
David B. Ryves ; Department of Geography, Loughborough University, Loughborough LE11 3TU, UK

Sažetak

The integrity of all sedimentary diatom assemblages is influenced to some degree by taphonomic processes. Recognising these processes with regard to preservation pathways for diatom assemblages and for individual species can be instructive for interpreting sediment core diatom records. Diatoms deposited in saline lakes are usually particularly exposed to both chemical and physical processes that promote poor preservation. Aspects of diatom preservation are explored in two markedly different saline lakes (one in North America and one in Egypt) and observations are used to make some initial inferences about diatom preservation. By applying dissolution indices to evaluate differences in valve preservation states between assemblages and between species in an objective manner, sedimentation processes and valve characteristics are indicated important implications for interpreting sedimentary diatom records. It is further argued that, by taking account of diatom dissolution states, both qualitative and quantitative inferences about past environments can be extended.

Ključne riječi

Diatom; dissolution; preservation; biogenic silica; ultrastructure; saline lake; sedimentation; taphonomy; climate change

Hrčak ID:

41437

URI

https://hrcak.srce.hr/41437

Datum izdavanja:

15.10.2009.

Posjeta: 3.563 *