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Climate and vegetational regime shifts in the late Paleozoic ice age earth

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dc.contributor.author DiMichele, William A. en
dc.contributor.author Montañez, I. P. en
dc.contributor.author Poulsen, C. J. en
dc.contributor.author Tabor, Neil J. en
dc.date.accessioned 2009-07-31T20:06:52Z
dc.date.available 2009-07-31T20:06:52Z
dc.date.issued 2009
dc.identifier.citation DiMichele, William A., Montañez, I. P., Poulsen, C. J., and Tabor, Neil J. 2009. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F7896">Climate and vegetational regime shifts in the late Paleozoic ice age earth</a>." <em>Geobiology</em>. 7 (2):200&ndash;226. <a href="https://doi.org/10.1111/j.1472-4669.2009.00192.x">https://doi.org/10.1111/j.1472-4669.2009.00192.x</a> en
dc.identifier.issn 1472-4677
dc.identifier.uri http://hdl.handle.net/10088/7896
dc.description.abstract The late Paleozoic earth experienced alternation between glacial and non-glacial climates at multiple temporal scales, accompanied by atmospheric CO2 fluctuations and global warming intervals, often attended by significant vegetational changes in equatorial latitudes of Pangaea. We assess the nature of climate2013vegetation interaction during two time intervals: middle2013late Pennsylvanian transition and Pennsylvanian2013Permian transition, each marked by tropical warming and drying. In case study 1, there is a catastrophic intra-biomic reorganization of dominance and diversity in wetland, evergreen vegetation growing under humid climates. This represents a threshold-type change, possibly a regime shift to an alternative stable state. Case study 2 is an inter-biome dominance change in western and central Pangaea from humid wetland and seasonally dry to semi-arid vegetation. Shifts between these vegetation types had been occurring in Euramerican portions of the equatorial region throughout the late middle and late Pennsylvanian, the drier vegetation reaching persistent dominance by Early Permian. The oscillatory transition between humid and seasonally dry vegetation appears to demonstrate a threshold-like behavior but probably not repeated transitions between alternative stable states. Rather, changes in dominance in lowland equatorial regions were driven by long-term, repetitive climatic oscillations, occurring with increasing intensity, within overall shift to seasonal dryness through time. In neither case study are there clear biotic or abiotic warning signs of looming changes in vegetational composition or geographic distribution, nor is it clear that there are specific, absolute values or rates of environmental change in temperature, rainfall distribution and amount, or atmospheric composition, approach to which might indicate proximity to a terrestrial biotic-change threshold. en
dc.format.extent 1507236 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.relation.ispartof Geobiology en
dc.title Climate and vegetational regime shifts in the late Paleozoic ice age earth en
dc.type Journal Article en
dc.identifier.srbnumber 77895
dc.identifier.doi 10.1111/j.1472-4669.2009.00192.x
rft.jtitle Geobiology
rft.volume 7
rft.issue 2
rft.spage 200
rft.epage 226
dc.description.SIUnit NMNH en
dc.description.SIUnit NH-Paleobiology en
dc.citation.spage 200
dc.citation.epage 226

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