Name: Geophysical Settings

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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Geophyscial settings clasified the study area into distinct geophysical “stages” based on the elevation, geology and soils. Our premise is that the characteristics of a geophysical setting represent enduring features that influence biotic differences in the flora, fauna, and natural communities (e.g. due to differences in pH, nutrients, drainage, erodibility) now, and these differences will continue to favor or select against different subsets of species under future climates. In addition, geophysical environments tend to share topographic characteristics and land use properties, both of which are key components of our site resilience metrics. Typically, bedrock-based environments are more topographically complex and have more intact natural landcover than deep soil environments, which are flatter and more likely to be converted to agriculture. Within these deep soil settings, remaining natural areas often have poorer soils or more topographic diversity than the surrounding farmlands due to the conversion of sites that are easiest to farm. </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN>Because geophysical settings are key drivers of biological diversity, a representation of the full range of settings is a critical conservation goal. To ensure this representation in our analysis, our final resilience scores are stratified by each geophysical setting to ensure the most resilient portions of each geophysical setting are identified. </SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN>For more information on the setting types, please see the individual regional reports which will describe the settings in more detail. Each region used specific elevation zones and geology types relevant to those sets of ecoregions and the reports will describe how ecological processes and patterns in biodiversity are associated with the specific substrate and elevational settings in those regions. For example, the Pacific-Northwest and California defined substrate classes using soil order given its influence on biota in this region. Other areas of the country defined geologic settings using the underlying bedrock type in shallow soil areas while using soil texture to define geologic settings in the very deep surficial sediment areas. </SPAN></P><P><SPAN /></P></DIV></DIV></DIV>

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Copyright Text: The Nature Conservancy, Eastern Resource Office, Eastern Conservation Science (ECS), Boston, MA Source Reports from which this national dataset was created: Anderson, M.G., A. Barnett, M. Clark, C. Ferree, A. Olivero Sheldon, J. Prince. 2016. Resilient Sites for Terrestrial Conservation in Eastern North America. The Nature Conservancy, Eastern Conservation Science. Anderson, M.G., M. M. Clark, M.W. Cornett, K.R. Hall, A. Olivero Sheldon, J. Prince. 2018. Resilient Sites for Terrestrial Conservation in the Great Lakes and Tallgrass Prairie. The Nature Conservancy, Eastern Conservation Science and North America Region. Anderson, M.G., M.A. Ahlering, M. M. Clark, K.R. Hall, A. Olivero Sheldon, J. Platt and J. Prince. 2018. Resilient Sites for Terrestrial Conservation in the Great Plains. The Nature Conservancy, Eastern Conservation Science and North America Region. Anderson, M.G., M. M. Clark, A. Olivero, and J. Prince. 2019. Resilient Sites and Connected Landscapes for Terrestrial Conservation in the Lower Mississippi-Ozark Region. The Nature Conservancy, Eastern Conservation Science. Anderson, M.G., M. M. Clark, A. Olivero, and J. Prince. 2019. Resilient Sites and Connected Landscapes for Terrestrial Conservation in the Rocky Mountains and Southwest Desert Region. The Nature Conservancy, Eastern Conservation Science. Buttrick, S., K. Popper, M. Schindel, B. McRae, B. Unnasch, A. Jones, and J. Platt. 2015. Conserving Nature’s Stage: Identifying Resilient Terrestrial Landscapes in the Pacific Northwest. The Nature Conservancy, Portland Oregon. 104 pp. Available online at: http://nature.ly/resilienceNW March 3, 2015

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