Water Shrew Welfare in UK Wetlands

The water shrew is Britains largest shrew, semi-aquatic and dependent on clean upland streams and wetlands. Pollution and water quality deterioration threaten welfare and populations.

Key Facts

Water shrews have a venomous bite used to paralyse invertebrate prey in water
They dive to feed on invertebrates, small fish, and amphibians in clear streams
Their survival depends on aquatic invertebrate abundance as a food source
Pollution reducing macroinvertebrate communities directly reduces food supply
They have very small territories and cannot travel long distances around barriers

Welfare Considerations

Water shrew welfare is directly linked to the quality of aquatic habitat within their small territories. Agricultural run-off, silt, and chemical pollution reduce the macroinvertebrate communities that they depend on for food. Their inability to disperse far means local habitat quality changes cannot be compensated by moving to better habitat. Maintenance of clean, well-oxygenated streams with diverse invertebrate communities through riparian management is the most effective welfare intervention for this cryptic and poorly studied species.

What You Can Do

Support catchment management reducing agricultural pollution in stream systems
Advocate for riparian buffer strip requirements along streams in agricultural areas
Donate to river restoration projects improving stream habitat quality
Participate in National Water Vole Survey which also records water shrew presence