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Differential drivers of benthic foraminiferal and molluscan community composition from a multivariate record of early Miocene environmental change

Published online by Cambridge University Press:  08 April 2016

Christina L. Belanger  and
Marites Villarosa Garcia
Christina L. Belanger
Affiliation:
Department of Geology and Geological Engineering, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701, U.S.A. E-mail: [email protected]
Marites Villarosa Garcia
Affiliation:
Department of Geophysical Sciences, University of Chicago, Chicago, Illinois 60637, U.S.A. E-mail: [email protected]
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Abstract

Climate changes are multivariate in nature, and disentangling the proximal drivers of biotic responses to paleoclimate events requires time series of multiple environmental proxies. We reconstruct a multivariate time series of local environmental change for the early Miocene Newport Member of the Astoria Formation (20.26–18 Ma), using proxies for temperature (δ18O), productivity (δ13C), organic carbon flux (Δδ13C), oxygenation (δ15N), and sedimentary grain size (% mud). Our data suggest increases in productivity and declines in oxygenation on the Oregon shelf during this interval of global warming. We evaluate the association of individual environmental factors, and combinations of factors, with changes in faunal composition observed in benthic foraminiferal and molluscan communities collected from the exact same sediments as the environmental data. The δ15N values are the most parsimonious correlates with major changes in foraminiferal composition, whereas molluscan composition is most closely related to δ13C values, suggesting that different components of the environment are influencing each group. When the proxies that have the best supported relationships with the faunal gradients are removed from the analyses to simulate the absence of those proxy data, significant relationships between the faunal gradients and the remaining environmental proxies can still be found. This suggests that environmental drivers can be incorrectly attributed to faunal changes when key proxy data are missing. Paleoecological studies of biotic response that test multiple environmental drivers for multiple taxonomic groups are powerful tools for identifying the ecological consequences of past warming events and the regional drivers of ecological changes.

Type
Articles
Information
Paleobiology , Volume 40 , Issue 3 , Summer 2014 , pp. 398 - 416
Copyright
Copyright © The Paleontological Society 

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