Phytoplankton assemblage in the Plio-Pleistocene record of Lake Baikal as indicated by sedimentary steryl chlorin esters
作者： Yukinori Tani , Fumiko Nara , Yuko Soma , Mitsuyuki Soma , Nobuyasu Itoh
DOI: 10.1016/J.QUAINT.2009.02.004
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摘要: Abstract Past changes in phytoplankton assemblages Lake Baikal over the last 4.5 Ma, both population and composition, are inferred from downcore profiles of relatively stable chlorophyll derivatives steryl esters pyropheophorbides a b (steryl chlorine esters; SCEs) 0–200 m section BDP-98 drill core, supplemented by data on biogenic silica (BSi) total organic carbon (TOC) contents. SCEs-a -b dominate among sedimentary sediments except for upper few meters, indicating their high stability during diagenetic alteration sediments. The depth (age) consistent with BSi TOC interpreted as reflecting primary productivity lake past. proxies reveal close correlation marine oxygen isotope records (MIS stratigraphy). These observations confirm that climate change northern hemisphere has been factor controlling several million years. Among SCEs-a, C30 (dinostanol)-SCE-a, marker dinoflagellates was identified GC–MS analysis. SCE-b, green algae, its UV–vis spectrum. ratio C30-SCE-a to (TSCEs-a) higher 4.5–4.2 1.7–1.3 Ma, suggesting proliferated preferentially those periods. early Pleistocene maximum this corresponds broad minimum diatom abundance previously suggested have recorded prolonged regional cooling. An abrupt increase SCE-b/TSCEs-a observed at 2.5–2.6 Ma, algae containing period. This interval also contain evidence significant cooling based minima profile C27Δ5 (cholesterol)-SCE-a relative TSCEs-a showed trend similar BSi, C27Δ5-SCE-a/TSCEs-a is potential diatoms Baikal. Certain mismatches between biological indicators records, well slight temporal offsets different signals suggest component climatic and/or lacustrine environmental played role determining composition Plio-Pleistocene assemblage.
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