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Providing evidence to improve practice

Individual study: Muskrat abundance responses to water level regulation within freshwater coastal wetlands

Published source details

Toner J., Farrell J.M. & Mead J.V. (2010) Muskrat abundance responses to water level regulation within freshwater coastal wetlands. Wetlands, 30, 211-219


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Manage wetland water levels for mammal species Terrestrial Mammal Conservation

A replicated, site comparison study in 2000–2006 at three wetland sites on the St Lawrence River, USA (Toner et al. 2010) found that managing wetland water levels to be higher in winter increased the abundance of muskrat Ondatra zibethicus houses. This result was not analysed for statistical significance. At wetlands where water levels were managed to be higher in winter, muskrat house density was higher (3.0 houses/ha) than in wetlands where water levels were not managed (0.7 houses/ha). At two wetland sites, in 2000–2004 and 2004–2006, water control structures were installed to increase water levels during winter. At a third site, no such structure was installed. Where water levels were not managed, they were lower during winter. Muskrat houses were counted at all sites in winters of 2001–2006, using unspecified methodologies.

(Summarised by Phil Martin)