introduction - Pennsylvania Natural Heritage Program

SMITH 1991 TYPESGLOBAL STATECOMMUNITY NAME RANK RANKSUBTERRANEAN COMMUNITIES:Solution Cave Terrestrial Community G? S3Solution Cave Aquatic Community G? S3Tectonic Cave Community G? S3S4Talus Cave Community G? S2S4DISTURBED COMMUNITIES:Bare Soil G? S?Meadow/Pastureland G? S?Cultivated Land G? S?Successional Field G? S?Young Miscellaneous Forest G? S?Conifer Plantation G? S?ESTUARINE COMMUNITIES:Deepwater Subtidal Community G? S1Shallow-Water Subtidal Community G? S1Freshwater Intertidal Mudflat G3G4 S1Freshwater Intertidal Marsh G3G4 S1RIVERINE COMMUNITIES:Low-Gradient Ephemeral/Intermittent Creek G? S5Low-Gradient Clearwater Creek G? S3S4Low-Gradient Clearwater River G? S2S3Low-Gradient Brownwater Creek G? S2S3Medium-Gradient Ephemeral/Intermittent Creek G? S5Medium-Gradient Clearwater Creek G? S3Medium-Gradient Clearwater River G? S?Medium-Gradient Brownwater Creek G? S3High-Gradient Ephemeral /Intermittent Creek G? S5High-Gradient Clearwater Creek G? S3High-Gradient Clearwater River G? S?High-Gradient Brownwater Creek G? S?Waterfall and Plungepool G? S3S4Spring Community G? S1S2Spring Run Community G? S1S2160