USGS - science for a changing world

USGS Professional Pages

Blank space
Search USGS Professionals Featured Profiles Blank space Frequently Asked Questions  |  About The USGS Professional Pages

Christopher Bernhardt

Research Geologist

Contact Info

Short Biography

Current Postion

♦  Research Geologist



♦  University of Pennsylvania, Ph.D. (2009)

♦  University of Akron, M.S. (2000)

♦  Baldwin Wallace College, B.S. (1998)

Bernhardt, C.E., Wingard, G.L., Willard, D.A., Marot, M.E., Landacre, B., and Holmes, C.W., 2013, Chronology from sediment cores collected in southwestern Everglades National Park, Florida: U.S. Geological Survey Open-File Report 2012‒1275, 59 p., (Available only online.)


Bernhardt, C.E., Horton, B.P., and Stanley, J.-D., 2012, Nile Delta vegetation response to Holocene climate variability, Geology 7: 615-618.


Bernhardt, C.E., 2011, Native Americans, regional drought, and tree island evolution in the Florida Everglades.  The Holocene, vol. 21, 967-978.


Bernhardt, C.E., Stanley, J-D., and Horton, B.P.,  2011, Wetland vegetation in Manzala Lagoon, Nile Delta coast, Egypt:  rapid responses of pollen to altered Nile hydrology and land use.  Journal of Coastal Research, vol. 27, 731-737.


Willard, D.A., and Bernhardt, C.E., 2011, Impacts of past climate and sea level change on Everglades wetlands: placing a century of anthropogenic change into a late-Holocene context. Climatic Change, vol. 107, 59-80.


Larsen, L , Aumen, N , Bernhardt, C., Engel, V., Givnish, T., Hagerthey, S., Harvey, J., Leonard, L., McCormick, P., McVoy, C., Noe, G., Nungesser, M., Rutchey, K., Sklar, F., Troxler, T., Volin, J.h , Willard, D., 2011. Recent and historic drivers of landscape change in the everglades ridge, Slough, and Tree Island Mosaic.  Critical Reviews in Environmental Science and Technology, vol. 21, Issue SUPPL. 1, p. 344-381.


Stanley, J-D., and Bernhardt, C.E.,  2010,  Alexandria’s Eastern Harbor, Egypt: pollen, microscopic charcoal, and the transition from natural to human-modified basin.  Journal of Coastal Research vol. 26: 67-79.  


Willard, D., Bernhardt, C., Brown, R., Landacre, B., and Townsend, P., 2010.  Pollen-based paleohydrologic reconstructions from late Holocene forested wetlands:  Lower Roanoke River Basin, North Carolina, United States.  The Holocene, vol. 21, 305-317.


Bernhardt, C.E. and Willard, D.A., 2009, Response of the Everglades sawgrass ridge and slough landscape to late Holocene climate variability and 20th century water-management practices.  Ecological Applications, vol. 19, 1723-1738.


Bernhardt, C.E, Mitchell, R. J., and Michaels, H. J., 2008, Effect of Lupinus perennis population size and local density on pollinator behavior.  International Journal of Plant Sciences vol.169, 944-953.


Culver, S.J., Farrell, K.M., Mallinson, D.J., Horton, B.P., Willard, D.A., Thieler, E.R., Riggs, S.R., Snyder, S.W., Wehmiller, J.F., Bernhardt, C.E., and Hillier, C., 2008, Micropaleontologic record of late Pliocene and Quaternary paleoenvironments in the northern Albemarle Embayment, North Carolina, U.S.A.  Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 264, 54-77.



Willard, D.A., Bernhardt, C.E., Brooks, G.R., Cronin, T., Edgar, T., and Larson, R., 2007, Deglacial climate variability in central Florida, USA.  Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 251, 366-382.


Willard, D.A, Bernhardt, C.E., Holmes, C.W., Landacre, B., and Marot, M., 2007, Response of Everglades tree islands to environmental change.  Ecological Monographs, vol. 76, 565-583.


Bernhardt, C.E. and Willard, D.A., 2006,  Marl prairie vegetation response to 20th century hydrologic change.  U.S. Geological Survey Open-file report 2006-1355.


Willard, D.A., Bernhardt, C.E., Korejwo, D.A., and Meyers, S.R., 2005, Eastern North American terrestrial ecosystem response to millennial-scale Holocene climate variability:  pollen-based climatic reconstruction.  Global and Planetary Change vol. 47, 17-35.


Willard, D.A., Bernhardt, C.E., Weimer, L., Cooper, S.R., Gamez, D., and Jensen, J., 2004, Atlas of pollen and spores of the Florida Everglades.  Palynology vol. 28, p. 175-227.


Bernhardt, C.E., Willard, D.A., Marot, M., and Holmes, C., 2004, Anthropologic and Natural Variation in the Ridge and Slough Pollen Assemblages. U.S. Geological Survey Open-File Report 2004-1448.


Willard, D.A. and Bernhardt, C.E., 2004, Pollen stratigraphy and land-use change, Pocomoke Sound. In Cronin, TM., ed., Pocomoke Sound Sedimentary and Ecosystem History.  U.S. Geological Survey Open-File Report OFR-2004-1350, Chapter 7.


Willard, D.A., Cronin, T.M., Bernhardt, C.E., and Damon, J., 2004, Sediment transport in Pocomoke Sound, Maryland inferred from microfossils in surface sediments. In Cronin, TM., ed., Pocomoke Sound Sedimentary and Ecosystem History.  U.S. Geological Survey Open-File Report OFR-2004-1350, Chapter 3.


Wingard, G.L., Cronin, T.M., Holmes, C.W., Willard, D.A., Dwyer, G., Ishman, S.E., Orem, W., Williams, C.P., Albietz, J., Bernhardt, C.E., Budet, C.A., Landacre, B., Lerch, T., Marot, M., and Ortiz, R.E., 2004, Ecosystem history of southern and central Biscayne Bay:  summary report on sediment core analyses – year two.  U.S. Geological Survey Open-File Report 2004-1312.




My Science Topics

Science Topic
Ecology and Environmentforests
Ecology and Environmentfreshwater ecosystems
Ecology and Environmentwetlands
Plants and Animalspaleobotany
Plants and Animalspalynology
Plants and Animalsvegetation
Earth Characteristicsbiostratigraphy

My USGS Science Strategy Areas

Climate Variability & Change

Atlantic and Gulf Coastal Plain Climate Variability

Image of Atlantic and Gulf Coastal Plain Climate Variability

This project is designed to generate high-resolution proxy records of late Holocene climate variability in the Atlantic and Gulf Coastal Plain, USA.  In this region, most pollen and plant macrofossils records have focused on large-scale patterns of the last deglaciation (~20 ka – 11.5 ka) and the Holocene (11.5 ka to present).  Although the broad changes tied to loss of the Laurentide Ice Sheet and mid-Holocene insolation changes have been well documented, few records have sufficient temporal resolution to document terrestrial response to decadal, multi-decadal, and centennial scale patterns of climate variability.  Sediment coring and pollen, microscopic charcoal, other proxies, and geochronology are used to document the vegetation response to changes in hydrology.  By generating these high-resolution vegetation records, the project will link the terrestrial response to well-documented climate events found in marine and ice cores.

Contact Information

Christopher Bernhardt
12201 Sunrise Valley Dr
Reston, VA 20192
703-648-6953 - Fax
Back to top

Accessibility FOIA Privacy Policies and Notices logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information:Ask USGS
Page Last Modified: January 24 2013 17:21:51.
Version: 2.6