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The Significant Surface-Water Connectivity of "Geographically Isolated Wetlands"
Aram J K Calhoun1, David M Mushet2, Laurie C Alexander3
1Department of Wildlife, Fisheries, and Conservation Biology, University of Maine, Orono, ME 04469, USA.
Wetlands (Wilmington, N.C.)
|August 28, 2018
Summary
The term "geographically isolated wetlands" is an oversimplification. Wetlands surrounded by uplands vary in their surface-water connectivity and should be assessed individually for effective conservation.
Area of Science:
- Wetland science
- Hydrology
- Ecology
Background:
- The classification of wetlands as "geographically isolated" is based on their surrounding upland landscape.
- Recent research highlights challenges in grouping these wetlands due to variable surface-water connectivity.
Purpose of the Study:
- To critically assess the scientific basis for grouping wetlands solely by their upland surroundings.
- To evaluate the ecological implications of the "geographically isolated wetlands" designation.
Main Methods:
- Literature review of surface-water connectivity in wetlands.
- Analysis of research expertise on wetland hydrology.
- Evaluation of existing wetland classification practices.
Main Results:
- The "geographically isolated wetlands" label is an oversimplification that does not accurately reflect hydrologic variability.
- Distance from streams is an unreliable metric for determining surface-water connections.
- Wetland function and connectivity depend on landscape setting, climate, and region.
Conclusions:
- The "geographically isolated wetlands" categorization is not scientifically supported and hinders effective wetland conservation.
- Wetlands surrounded by uplands should be evaluated based on their specific hydrologic characteristics.
- A nuanced approach is needed to understand and conserve diverse wetland resources.
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