Testing the basic assumption of the hydrogeomorphic approach to assessing wetland functions

Environmental Management
T Hruby

Abstract

The hydrogeomorphic (HGM) approach for developing "rapid" wetland function assessment methods stipulates that the variables used are to be scaled based on data collected at sites judged to be the best at performing the wetland functions (reference standard sites). A critical step in the process is to choose the least altered wetlands in a hydrogeomorphic subclass to use as a reference standard against which other wetlands are compared. The basic assumption made in this approach is that wetlands judged to have had the least human impact have the highest level of sustainable performance for all functions. The levels at which functions are performed in these least altered wetlands are assumed to be "characteristic" for the subclass and "sustainable." Results from data collected in wetlands in the lowlands of western Washington suggest that the assumption may not be appropriate for this region. Teams developing methods for assessing wetland functions did not find that the least altered wetlands in a subclass had a range of performance levels that could be identified as "characteristic" or "sustainable." Forty-four wetlands in four hydrogeomorphic subclasses (two depressional subclasses and two riverine subclasses) were rated by tea...Continue Reading

Citations

Jul 17, 2008·Environmental Management·S M Hoeltje, C A Cole
Oct 14, 2008·Environmental Management·Emilie K Stander, Joan G Ehrenfeld
Nov 23, 2013·Ecological Applications : a Publication of the Ecological Society of America·Daniel L McLaughlin, Matthew J Cohen
Mar 25, 2009·Environmental Management·Thomas Hruby

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