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In a recent paper published in the journal Wetlands, Diane De Steven and her colleagues present a 5 year restoration experiment where they tried to pilot restored coastal depressional wetlands in South Carolina to either herbaceous wetlands or wet forests. They failed!
Well, they didn’t fail overall. In fact, they generate a whole suite of restored wetlands that are well within the range of preserved wetlands in the region in terms of hydrology and plant communities. What they failed to do was to correctly predict which one of the 16 wetlands they restored would (likely) evolve into either a herbaceous wetland or a wet forest. This is because they could not predict the restored hydrology of each wetland (restored by plugging drains) which is the main determinant of tree establishment, ahead of planting tree seedlings into the wetlands targeted to become wet forests.
Diane De Steven and her colleagues draw several conclusions from this outcome :
These are interesting ideas to keep in mind when discussing restoration (of course!) but also in designing assessment methods for wetland mitigation : with which metrics and against which targets should losses and gains in wetland condition be assessed?
Tags: USA, Wetland mitigation, Wetlands