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Endemism in Wyoming plant and insect herbivore communities during the early Eocene hothouse

Published online by Cambridge University Press:  20 June 2019

Ellen D. Currano Open the ORCID record for Ellen D. Currano [Opens in a new window] ,
Esther R. S. Pinheiro ,
Robert Buchwaldt ,
William C. Clyde  and
Ian M. Miller
Ellen D. Currano
Affiliation:
Departments of Botany and Geology & Geophysics, University of Wyoming, Laramie, Wyoming 82071, U.S.A. E-mail: ecurrano@uwyo.edu
Esther R. S. Pinheiro
Affiliation:
Department of Botany, University of Wyoming, Laramie, Wyoming 82071, U.S.A. E-mail: esther.rspinheiro@gmail.com
Robert Buchwaldt
Affiliation:
Department of Earth and the Environment, Boston University, Boston, Massachusetts 02215, U.S.A. E-mail: buchwalr@bu.edu
William C. Clyde
Affiliation:
Department of Earth Sciences, University of New Hampshire, Durham, New Hampshire 03824, U.S.A. E-mail: will.clyde@unh.edu
Ian M. Miller
Affiliation:
Department of Earth Sciences, Denver Museum of Nature & Science, Denver, Colorado 80205, U.S.A. E-mail: ian.miller@dmns.org
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Abstract

The warm, equable, and ice-free early Eocene Epoch permits investigation of ecosystem function and macro-ecological patterns during a very different climate regime than exists today. It also provides insight into what the future may entail, as anthropogenic CO2 release drives Earth toward a comparable hothouse condition. Studying plant–insect herbivore food webs during hothouse intervals is warranted, because these account for the majority of nonmicrobial terrestrial biodiversity. Here, we report new plant and insect herbivore damage census data from two floodplain sites in the Wind River Basin of central Wyoming, one in the Aycross Formation (50–48.25 Ma) at the basin edge (WRE) and the second in the Wind River Formation in the interior of the basin (WRI). The WRI site is in stratigraphic proximity to a volcanic ash that is newly dated to 52.416 ± 0.016/0.028/0.063 (2σ). We compare the Wind River Basin assemblages to published data from a 52.65 Ma floodplain flora in the neighboring Bighorn (BH) Basin and find that only 5.6% of plant taxa occur at all three sites and approximately 10% occur in both basins. The dissimilar floras support distinct suites of insect herbivores, as recorded by leaf damage. The relatively low-diversity BH flora has the highest diversity of insect damage, contrary to hypotheses that insect herbivore diversity tracks floral diversity. The distinctiveness of the WRE flora is likely due to its younger age and cooler reconstructed paleotemperature, but these factors are nearly identical for the WRI and BH floras. Site-specific microenvironmental factors that cannot be measured easily in deep time may account for these differences. Alternatively, the Owl Creek Mountains between the two basins may have provided a formidable barrier to the thermophilic organisms that inhabited the basin interiors, supporting Janzen's hypothesis that mountain passes appear higher in tropical environments.

Type
Articles
Information
Paleobiology , Volume 45 , Issue 3 , August 2019 , pp. 421 - 439
Copyright
Copyright © The Paleontological Society. All rights reserved 2019 

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Footnotes

Data available from the Dryad Digital Repository: https://doi.org/10.5061/dryad.fb821k5

References

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