HR: 0800h
AN: OS11A-0187    [Abstracts]
TI: Coupled Biodiversity And Climate Evolution Through The Phanerozoic Eon
AU: * Brooks, B
EM: bjorn@climatemodeling.org
AF: Iowa State University, 253 Science I, Ames, IA 50011-3212, United States
AU: Cervato, C
EM: cinzia@iastate.edu
AF: Iowa State University, 253 Science I, Ames, IA 50011-3212, United States
AB: The recent discovery of two prominent extinction cycles throughout the Phanerozoic has caught the attention of many, initiating research into the causes of these periodic biodiversity anomalies in areas such as climate and cosmic forcing. The fossil record however, is dominated by marine fossil taxa, comprising more than four-fifths of the total Phanerozoic genera. It is therefore sensible to search for causes that are most likely to effect change in marine biodiversity, such as the ¹⁸O/¹⁶O composition of seawater. The δ¹⁸O composition of the ancient oceans has been used as an indicator of high and low sea surface evaporation and ocean temperature. This study notes a prominent cycle within δ¹⁸O estimates that corresponds to a recently discovered extinction cycle (Rohde and Muller, 2005). The coincidence of these two cycles suggests that marine ocean temperature or salinity may have been an influential driving force for Phanerozoic biodiversity.
DE: 4805 Biogeochemical cycles, processes, and modeling (0412, 0414, 0793, 1615, 4912)
DE: 4912 Biogeochemical cycles, processes, and modeling (0412, 0414, 0793, 1615, 4805)
SC: Ocean Sciences [OS]
MN: 2007 Fall Meeting