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Lateral trends in carbon isotope ratios reveal a Miocene vegetation gradient in the Siwaliks of Pakistan

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dc.contributor.author Morgan, Michele E. en
dc.contributor.author Behrensmeyer, Anna K. en
dc.contributor.author Badgley, Catherine en
dc.contributor.author Barry, John C. en
dc.contributor.author Nelson, Sherry en
dc.contributor.author Pilbeam, David en
dc.date.accessioned 2009-06-08T14:26:24Z
dc.date.available 2009-06-08T14:26:24Z
dc.date.issued 2009
dc.identifier.citation Morgan, Michele E., Behrensmeyer, Anna K., Badgley, Catherine, Barry, John C., Nelson, Sherry, and Pilbeam, David. 2009. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F7526">Lateral trends in carbon isotope ratios reveal a Miocene vegetation gradient in the Siwaliks of Pakistan</a>." <em>Geology</em>. 37 (2):103&ndash;106. <a href="https://doi.org/10.1130/G25359A.1">https://doi.org/10.1130/G25359A.1</a> en
dc.identifier.issn 0091-7613
dc.identifier.uri http://hdl.handle.net/10088/7526
dc.description.abstract Isotopic analyses of mammalian tooth enamel from a well-defined, laterally extensive 150 k.y. interval (9.15-9.30 Ma) reveal an ecological gradient in vegetation on the late Miocene sub-Himalayan alluvial plain. Two contemporaneous river systems deposited the sediments of this interval, with a mountain-sourced system (herein, Blue-gray) to the southwest interfingering with a foothill-sourced system (Buff) to the northeast. Fossil mammal teeth collected from a 32 km transect across this fluvial gradient are significantly more depleted in 13C from northeastern localities than from southwestern localities. This trend occurs in equids, giraffids, suids, sivapithecine hominoids, and anthracotheres. We propose that the Buff fluvial system provided more equably moist substrate conditions and supported more closed-canopy vegetation than the Blue-gray fluvial system. Herbivores living along the paleovegetation gradient thus acquired different carbon isotopic signatures during the period of tooth enamel formation, resulting from higher {delta}13C values in the forage supported by the Blue-gray fluvial system compared with forage associated with the Buff system. The data also imply that many Siwalik mammalian herbivores displayed marked fidelity in juvenile home ranges and habitats. en
dc.format.extent 370853 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.relation.ispartof Geology en
dc.title Lateral trends in carbon isotope ratios reveal a Miocene vegetation gradient in the Siwaliks of Pakistan en
dc.type Journal Article en
dc.identifier.srbnumber 77295
dc.identifier.doi 10.1130/G25359A.1
rft.jtitle Geology
rft.volume 37
rft.issue 2
rft.spage 103
rft.epage 106
dc.description.SIUnit NH-Paleobiology en
dc.description.SIUnit NMNH en
dc.citation.spage 103
dc.citation.epage 106

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