David C Walters
David is a biological science tech with the Eastern Ecological Science Center at the Patuxent Research Refuge in Laurel, MD
David is a wetland ecologist, researching how coastal wetlands respond to sea level rise. With a background in biological and physical sciences, his work focuses on the interaction between wetland plant species and their physical environment.
Professional Experience
2020-Present - U.S. Geological Survey, Eastern Ecological Science Center, Biologist, Coastal Wetlands Group
2017-2020 - NSA Contractor with U.S. Geological Survey, Patuxent Wildlife Research Refuge, Coastal Wetlands Group
2013-2017 - Virginia Institute of Marine Science, Laboratory and Research Specialist
Education and Certifications
M.S., University of North Carolina- Chapel Hill, Geology (2013)
B.S., Longwood Univerity, Biology, concentration in Ecology (2011)
Science and Products
Filter Total Items: 83
Pharmaceuticals and personal care products (PPCPs) are ecological disrupting compounds (EcoDC) Pharmaceuticals and personal care products (PPCPs) are ecological disrupting compounds (EcoDC)
Pharmaceuticals and personal care products (PPCPs) are ubiquitous in freshwater ecosystems worldwide and are recognized as contaminants of concern. Currently, contaminants of concern are classified for their persistence, bioaccumulation, and toxicity (PBT criteria). PPCPs are not classified as persistent organic pollutants (POPs), although some PPCPs share characteristics similar to POPs...
Authors
Erinn Richmond, Michael R. Grace, John R. Kelly, Andrew Reisinger, Emma J. Rosi, David M. Walters
Riparian spiders as sentinels of polychlorinated biphenyl contamination across heterogeneous aquatic ecosystems Riparian spiders as sentinels of polychlorinated biphenyl contamination across heterogeneous aquatic ecosystems
Riparian spiders are being used increasingly to track spatial patterns of contaminants in and fluxing from aquatic ecosystems.However, our understanding of the circumstances under which spiders are effective sentinels of aquatic pollution is limited. The present study tests the hypothesis that riparian spiders may be effectively used to track spatial patterns of sediment pollution by
Authors
Johanna M. Kraus, Polly P. Gibson, David M. Walters, Marc A. Mills
Sea level driven marsh expansion in a coupled model of marsh erosion and migration Sea level driven marsh expansion in a coupled model of marsh erosion and migration
Coastal wetlands are among the most valuable ecosystems on Earth, where ecosystem services such as flood protection depend nonlinearly on wetland size and are threatened by sea level rise and coastal development. Here we propose a simple model of marsh migration into adjacent uplands and couple it with existing models of seaward edge erosion and vertical soil accretion to explore how...
Authors
Matthew L. Kirwan, David C. Walters, William G. Reay, Joel A. Carr
Macroinvertebrate community sample collection methods and data collected from Sand Creek and Medano Creek, Great Sand Dunes National Park and Preserve, Colorado, 2005–07 Macroinvertebrate community sample collection methods and data collected from Sand Creek and Medano Creek, Great Sand Dunes National Park and Preserve, Colorado, 2005–07
This report provides a table of site descriptions, sample information, and semiquantitative aquatic macroinvertebrate data from 105 samples collected between 2005 and 2007 from 7 stream sites within the Sand Creek and Medano Creek watersheds in Great Sand Dunes National Park and Preserve, Saguache County, Colorado. Additionally, a short description of sample collection methods and...
Authors
Morgan A. Ford, Robert E. Zuellig, David M. Walters, James F. Bruce
A modeling approach to compare ΣPCB concentrations between congener-specific analyses A modeling approach to compare ΣPCB concentrations between congener-specific analyses
Changes in analytical methods over time pose problems for assessing long-term trends in environmental contamination by polychlorinated biphenyls (PCBs). Congener-specific analyses vary widely in the number and identity of the 209 distinct PCB chemical configurations (congeners) that are quantified, leading to inconsistencies among summed PCB concentrations (ΣPCB) reported by different...
Authors
Polly P. Gibson, Marc A. Mills, Johanna M. Kraus, David M. Walters
Assessing atmospheric concentration of polychlorinated biphenyls (PCBs) by evergreen Rhododendron maximum next to a contaminated stream Assessing atmospheric concentration of polychlorinated biphenyls (PCBs) by evergreen Rhododendron maximum next to a contaminated stream
Conifers are often used as an “air passive sampler”, but few studies have focused on the implication of broadleaf evergreens to monitor atmospheric semivolatile organic compounds such as polychlorinated biphenyls (PCBs). In this study, we used Rhododendron maximum (rhododendron) growing next to a contaminated stream to assess atmospheric PCB concentrations. The study area was located in...
Authors
Viet D. Dang, David Walters, Cindy M. Lee
Non-USGS Publications**
Lauzon, R., Murray, A. B., Moore, L. J., Walters, D. C., Kirwan, M. L., & Fagherazzi, S. (2018). Effects of marsh edge erosion in coupled barrier island-marsh systems and geometric constraints on marsh evolution. Journal of Geophysical Research: Earth Surface, 123, 1218– 1234. https://doi.org/10.1029/2017JF004530
Moore, L.J. et al. (2018). The Role of Ecomorphodynamic Feedbacks and Landscape Couplings in Influencing the Response of Barriers to Changing Climate. In: Moore, L., Murray, A. (eds) Barrier Dynamics and Response to Changing Climate. Springer, Cham. https://doi.org/10.1007/978-3-319-68086-6_10
Schieder, N.W., Walters, D.C. & Kirwan, M.L. Massive Upland to Wetland Conversion Compensated for Historical Marsh Loss in Chesapeake Bay, USA. Estuaries and Coasts 41, 940–951 (2018). https://doi.org/10.1007/s12237-017-0336-9
Walters, D.C. & M.L. Kirwan, Optimal hurricane overwash thickness for maximizing marsh resilience to sea level rise, Ecology and Evolution (2016). https://onlinelibrary.wiley.com/doi/10.1002/ece3.2024
Moore, L.J., Walters, D.C., et al., Ecomorphodynamic feedbacks and couplings between landscape units affect barrier island response to changing climate. In: Coastal Sediments, (2015). https://www.worldscientific.com/doi/10.1142/9789814689977_0246
Walters, D., et al., Interactions between barrier islands and backbarrier marshes affect island system response to sea level rise: Insights from a coupled model, Journal of Geophysical Research: Earth Surface, (2014). https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2014JF003091
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
Filter Total Items: 83
Pharmaceuticals and personal care products (PPCPs) are ecological disrupting compounds (EcoDC) Pharmaceuticals and personal care products (PPCPs) are ecological disrupting compounds (EcoDC)
Pharmaceuticals and personal care products (PPCPs) are ubiquitous in freshwater ecosystems worldwide and are recognized as contaminants of concern. Currently, contaminants of concern are classified for their persistence, bioaccumulation, and toxicity (PBT criteria). PPCPs are not classified as persistent organic pollutants (POPs), although some PPCPs share characteristics similar to POPs...
Authors
Erinn Richmond, Michael R. Grace, John R. Kelly, Andrew Reisinger, Emma J. Rosi, David M. Walters
Riparian spiders as sentinels of polychlorinated biphenyl contamination across heterogeneous aquatic ecosystems Riparian spiders as sentinels of polychlorinated biphenyl contamination across heterogeneous aquatic ecosystems
Riparian spiders are being used increasingly to track spatial patterns of contaminants in and fluxing from aquatic ecosystems.However, our understanding of the circumstances under which spiders are effective sentinels of aquatic pollution is limited. The present study tests the hypothesis that riparian spiders may be effectively used to track spatial patterns of sediment pollution by
Authors
Johanna M. Kraus, Polly P. Gibson, David M. Walters, Marc A. Mills
Sea level driven marsh expansion in a coupled model of marsh erosion and migration Sea level driven marsh expansion in a coupled model of marsh erosion and migration
Coastal wetlands are among the most valuable ecosystems on Earth, where ecosystem services such as flood protection depend nonlinearly on wetland size and are threatened by sea level rise and coastal development. Here we propose a simple model of marsh migration into adjacent uplands and couple it with existing models of seaward edge erosion and vertical soil accretion to explore how...
Authors
Matthew L. Kirwan, David C. Walters, William G. Reay, Joel A. Carr
Macroinvertebrate community sample collection methods and data collected from Sand Creek and Medano Creek, Great Sand Dunes National Park and Preserve, Colorado, 2005–07 Macroinvertebrate community sample collection methods and data collected from Sand Creek and Medano Creek, Great Sand Dunes National Park and Preserve, Colorado, 2005–07
This report provides a table of site descriptions, sample information, and semiquantitative aquatic macroinvertebrate data from 105 samples collected between 2005 and 2007 from 7 stream sites within the Sand Creek and Medano Creek watersheds in Great Sand Dunes National Park and Preserve, Saguache County, Colorado. Additionally, a short description of sample collection methods and...
Authors
Morgan A. Ford, Robert E. Zuellig, David M. Walters, James F. Bruce
A modeling approach to compare ΣPCB concentrations between congener-specific analyses A modeling approach to compare ΣPCB concentrations between congener-specific analyses
Changes in analytical methods over time pose problems for assessing long-term trends in environmental contamination by polychlorinated biphenyls (PCBs). Congener-specific analyses vary widely in the number and identity of the 209 distinct PCB chemical configurations (congeners) that are quantified, leading to inconsistencies among summed PCB concentrations (ΣPCB) reported by different...
Authors
Polly P. Gibson, Marc A. Mills, Johanna M. Kraus, David M. Walters
Assessing atmospheric concentration of polychlorinated biphenyls (PCBs) by evergreen Rhododendron maximum next to a contaminated stream Assessing atmospheric concentration of polychlorinated biphenyls (PCBs) by evergreen Rhododendron maximum next to a contaminated stream
Conifers are often used as an “air passive sampler”, but few studies have focused on the implication of broadleaf evergreens to monitor atmospheric semivolatile organic compounds such as polychlorinated biphenyls (PCBs). In this study, we used Rhododendron maximum (rhododendron) growing next to a contaminated stream to assess atmospheric PCB concentrations. The study area was located in...
Authors
Viet D. Dang, David Walters, Cindy M. Lee
Non-USGS Publications**
Lauzon, R., Murray, A. B., Moore, L. J., Walters, D. C., Kirwan, M. L., & Fagherazzi, S. (2018). Effects of marsh edge erosion in coupled barrier island-marsh systems and geometric constraints on marsh evolution. Journal of Geophysical Research: Earth Surface, 123, 1218– 1234. https://doi.org/10.1029/2017JF004530
Moore, L.J. et al. (2018). The Role of Ecomorphodynamic Feedbacks and Landscape Couplings in Influencing the Response of Barriers to Changing Climate. In: Moore, L., Murray, A. (eds) Barrier Dynamics and Response to Changing Climate. Springer, Cham. https://doi.org/10.1007/978-3-319-68086-6_10
Schieder, N.W., Walters, D.C. & Kirwan, M.L. Massive Upland to Wetland Conversion Compensated for Historical Marsh Loss in Chesapeake Bay, USA. Estuaries and Coasts 41, 940–951 (2018). https://doi.org/10.1007/s12237-017-0336-9
Walters, D.C. & M.L. Kirwan, Optimal hurricane overwash thickness for maximizing marsh resilience to sea level rise, Ecology and Evolution (2016). https://onlinelibrary.wiley.com/doi/10.1002/ece3.2024
Moore, L.J., Walters, D.C., et al., Ecomorphodynamic feedbacks and couplings between landscape units affect barrier island response to changing climate. In: Coastal Sediments, (2015). https://www.worldscientific.com/doi/10.1142/9789814689977_0246
Walters, D., et al., Interactions between barrier islands and backbarrier marshes affect island system response to sea level rise: Insights from a coupled model, Journal of Geophysical Research: Earth Surface, (2014). https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2014JF003091
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.