Christopher Bernhardt, Ph.D.
Chris Bernhardt is the Center Director of the USGS Florence Bascom Geoscience Center.
Education and Certifications
University of Pennsylvania, Ph.D. (2009)
University of Akron, M.S. (2000)
Baldwin Wallace College, B.S. (1998)
Science and Products
Filter Total Items: 31
Chronology from sediment cores collected in southwestern Everglades National Park, Florida Chronology from sediment cores collected in southwestern Everglades National Park, Florida
Age model data are presented for 10 cores from the southwestern coastal mangrove zone of Everglades National Park, Florida, collected in Common Era (CE) 2004 and 2005 and used for paleoecological analysis. Carbon-14 (14C), lead-210 (210Pb), cesium-137 (137Cs), radium-226 (226Ra), and pollen biostratigraphic information is included, and age models were generated for 6 of the 10 cores. Age...
Authors
C.E. Bernhardt, G.L. Wingard, Debra A. Willard, M. E. Marot, B. Landacre, C. W. Holmes
Quantification of water-level variability effect on plant species populations using paleoecological and hydrological time series data Quantification of water-level variability effect on plant species populations using paleoecological and hydrological time series data
Soil cores provide valuable data on historical changes in vegetation and hydrologic conditions. Empirical models were developed to quantify the effect of meteorological and hydrologic forcing on plant species distributions over a 110-year period in Water Conservation Area 1 (WCA1) in the Florida Everglades, also known as the Arthur R. Marshall Loxahatchee National Wildlife Refuge...
Authors
Edwin A. Roehl, Paul Conrads, Christopher Bernhardt
Nile Delta vegetation response to Holocene climate variability Nile Delta vegetation response to Holocene climate variability
A 7000 yr palynologic record from Burullus Lagoon, Nile Delta, Egypt, is assessed to investigate changes in terrestrial vegetation in response to Nile flow. Previous studies in this region have shown that sea-level rise in the early to mid-Holocene, and markedly increased human land use during the past several centuries, altered vegetation in and around the lagoon. The pollen record from...
Authors
Christopher E. Bernhardt, Benjamin P. Horton, Jean-Daniel Stanley
Recent and historic drivers of landscape change in the Everglades ridge, slough, and Tree Island mosaic Recent and historic drivers of landscape change in the Everglades ridge, slough, and Tree Island mosaic
More than half of the original Everglades extent formed a patterned peat mosaic of elevated ridges, lower and more open sloughs, and tree islands aligned parallel to the dominant flow direction. This ecologically important landscape structure remained in a dynamic equilibrium for millennia prior to rapid degradation over the past century in response to human manipulation of the...
Authors
Laurel G. Larsen, Nicholas Aumen, Christopher E. Bernhardt, Vic Engel, Thomas J. Givnish, P McCormick S Hagerthey, Judson Harvey, Lynn Leonard, P. McCormick, Christopher McVoy, Gregory E. Noe, Martha K. Nungesser, K. Rutchey, Fred Sklar, Tiffany G. Troxler, John C. Volin, Debra A. Willard
Impacts of past climate and sea level change on Everglades wetlands: placing a century of anthropogenic change into a late-Holocene context Impacts of past climate and sea level change on Everglades wetlands: placing a century of anthropogenic change into a late-Holocene context
We synthesize existing evidence on the ecological history of the Florida Everglades since its inception ~7 ka (calibrated kiloannum) and evaluate the relative impacts of sea level rise, climate variability, and human alteration of Everglades hydrology on wetland plant communities. Initial freshwater peat accumulation began between 6 and 7 ka on the platform underlying modern Florida Bay...
Authors
Debra A. Willard, C.E. Bernhardt
Development and application of a pollen-based paleohydrologic reconstruction from the lower Roanoke River Basin, North Carolina, USA Development and application of a pollen-based paleohydrologic reconstruction from the lower Roanoke River Basin, North Carolina, USA
We used pollen assemblages to reconstruct late-Holocene paleohydrologic patterns in floodplain deposits from the lower Roanoke River basin (North Carolina, southeastern USA). Using 120 surface samples from 38 transects, we documented statistical relationships between pollen assemblages, vegetation, and landforms. Backswamp pollen assemblages (long hydroperiods) are dominated by Nyssa...
Authors
D. Willard, C. Bernhardt, R. Brown, B. Landacre, P. Townsend
Science and Products
Filter Total Items: 31
Chronology from sediment cores collected in southwestern Everglades National Park, Florida Chronology from sediment cores collected in southwestern Everglades National Park, Florida
Age model data are presented for 10 cores from the southwestern coastal mangrove zone of Everglades National Park, Florida, collected in Common Era (CE) 2004 and 2005 and used for paleoecological analysis. Carbon-14 (14C), lead-210 (210Pb), cesium-137 (137Cs), radium-226 (226Ra), and pollen biostratigraphic information is included, and age models were generated for 6 of the 10 cores. Age...
Authors
C.E. Bernhardt, G.L. Wingard, Debra A. Willard, M. E. Marot, B. Landacre, C. W. Holmes
Quantification of water-level variability effect on plant species populations using paleoecological and hydrological time series data Quantification of water-level variability effect on plant species populations using paleoecological and hydrological time series data
Soil cores provide valuable data on historical changes in vegetation and hydrologic conditions. Empirical models were developed to quantify the effect of meteorological and hydrologic forcing on plant species distributions over a 110-year period in Water Conservation Area 1 (WCA1) in the Florida Everglades, also known as the Arthur R. Marshall Loxahatchee National Wildlife Refuge...
Authors
Edwin A. Roehl, Paul Conrads, Christopher Bernhardt
Nile Delta vegetation response to Holocene climate variability Nile Delta vegetation response to Holocene climate variability
A 7000 yr palynologic record from Burullus Lagoon, Nile Delta, Egypt, is assessed to investigate changes in terrestrial vegetation in response to Nile flow. Previous studies in this region have shown that sea-level rise in the early to mid-Holocene, and markedly increased human land use during the past several centuries, altered vegetation in and around the lagoon. The pollen record from...
Authors
Christopher E. Bernhardt, Benjamin P. Horton, Jean-Daniel Stanley
Recent and historic drivers of landscape change in the Everglades ridge, slough, and Tree Island mosaic Recent and historic drivers of landscape change in the Everglades ridge, slough, and Tree Island mosaic
More than half of the original Everglades extent formed a patterned peat mosaic of elevated ridges, lower and more open sloughs, and tree islands aligned parallel to the dominant flow direction. This ecologically important landscape structure remained in a dynamic equilibrium for millennia prior to rapid degradation over the past century in response to human manipulation of the...
Authors
Laurel G. Larsen, Nicholas Aumen, Christopher E. Bernhardt, Vic Engel, Thomas J. Givnish, P McCormick S Hagerthey, Judson Harvey, Lynn Leonard, P. McCormick, Christopher McVoy, Gregory E. Noe, Martha K. Nungesser, K. Rutchey, Fred Sklar, Tiffany G. Troxler, John C. Volin, Debra A. Willard
Impacts of past climate and sea level change on Everglades wetlands: placing a century of anthropogenic change into a late-Holocene context Impacts of past climate and sea level change on Everglades wetlands: placing a century of anthropogenic change into a late-Holocene context
We synthesize existing evidence on the ecological history of the Florida Everglades since its inception ~7 ka (calibrated kiloannum) and evaluate the relative impacts of sea level rise, climate variability, and human alteration of Everglades hydrology on wetland plant communities. Initial freshwater peat accumulation began between 6 and 7 ka on the platform underlying modern Florida Bay...
Authors
Debra A. Willard, C.E. Bernhardt
Development and application of a pollen-based paleohydrologic reconstruction from the lower Roanoke River Basin, North Carolina, USA Development and application of a pollen-based paleohydrologic reconstruction from the lower Roanoke River Basin, North Carolina, USA
We used pollen assemblages to reconstruct late-Holocene paleohydrologic patterns in floodplain deposits from the lower Roanoke River basin (North Carolina, southeastern USA). Using 120 surface samples from 38 transects, we documented statistical relationships between pollen assemblages, vegetation, and landforms. Backswamp pollen assemblages (long hydroperiods) are dominated by Nyssa...
Authors
D. Willard, C. Bernhardt, R. Brown, B. Landacre, P. Townsend