Wetlands are effective – on average the removal efficiency is 40%.

A widely used method for reducing the input of nutrients into freshwater and marine environments is to allow contributing water to pass through a created or restored wetland. Mistra EviEM has assessed the evidence and concluded that this intervention generally works well. The variation between wetlands is however large, and to obtain significant effects it is important to carefully consider where and how the wetland is constructed.

More projects

Reviews

Mowing grass verge with tractor mower. Photo: hansslegers via iStockphoto.

SR17 Roadside vegetation removal

How should roadside management be carried out to benefit biodiversity? A systematic review.

Farmlands with various crops. Copyright: Amanda Langford, from iStockphoto

SR16 Crop rotation

A systematic review on which crop rotations are favourable for organic carbon in agricultural soil.

A forest fire in progress. Copyright: Dmytro Gilitukha, from iStockphoto

SR15 Prescribed burning

EviEM synthesises evidence on how prescribed forest burning affect species that do not directly depend on fire or the dead wood that fires provide.

Rapeseed can be protected from insects by neonicotinoid insecticides. Photo: iStockphoto, copyright: mtreasure

SR14 Neonicotinoids

A systematic review on adverse effects on non-target organisms and exposure via occurrence of NNIs in various parts of the environment.