geo 12 - The Dynamics of Tropical Vegetational Change...

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Unformatted text preview: The Dynamics of Tropical Vegetational Change During the Final Stage of the Late Paleozoic Ice Age and Subsequent Deglaciation DIMICHELE, William A. 1 , LOOY, Cynthia V. 1 , MONTANEZ, Isabel P. 2 , and TABOR, Neil J. 3 (1) Paleobiology, National Museum of Nat History, Smithsonian Institution, Washington, DC 20560 (2) Dept. of Geology, Univ of California - Davis, One Shields Avenue, Davis, CA 95616-8605 (3) Department of Geological Sciences, Southern Methodist Univ, Dedman College, Dallas, TX 75275 Vegetational change in tropical latitudes during the late Paleozoic is hierarchical and can be characterized as within-biome and between-biome. Within-biome change consists largely of persistent dominance- diversity patterns with gradual species turnover, via background extinction and origination, at levels of less than 10% between stratigraphically successive, isotaphonomic sampling points (presumed glacial- interglacial events during some time intervals). Rarely, within-biome change may involve highly elevated interglacial events during some time intervals)....
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