Structures and Applications of Biomarkers from Arctic Sea Ice Diatoms (original) (raw)

Encyclopedia of Quaternary Science, 2013

Abstract

Polar oceans are characterized by the presence of seasonal and multiyear sea ice which can provide a habitat for autotrophic and heterotrophic organisms with diatoms dominating the bottom ice photosynthetic organisms. Sea ice diatoms produce a series of readily identifiable biomarker chemicals including fatty acids, sterols, and highly branched isoprenoid (HBI) alkenes. One monounsaturated HBI alkene, IP 25 , is specific to Arctic sea ice diatoms and its presence in underlying marine sediments has formed the basis of a proxy method for determining paleo-sea ice records.

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