A drainage ditch can hold river life without becoming a natural stream
WHAT THE EVIDENCE SAYS
Sampling 32 reaches across natural streams, modified waterways and ditches showed higher macroinvertebrate taxa richness in natural streams, while overall diversity and abundance were similar across waterway classes. Till ditches and modified channels often resembled natural streams; peat ditches had different acidity and substrates. Catchment size and pH helped explain richness.
WHY IT MATTERS / OUR READ
The word artificial is a poor ecological diagnosis. Before infilling or reshaping long-established forest drainage, examine organisms already using it, the local hydrology and soil, and potential wetland, peat-carbon and flood consequences.
CAVEATS / UNCERTAINTY
One Swedish catchment and benthic invertebrate metrics do not prove hydrologic equivalence, fish passage, carbon balance or restoration outcomes.
SOURCE
Ambio — Zivec et al. (2026)
View original evidence ↗
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