30 year river study finds overlooked extinction effect’

The number of specialist invertebrates is dwindling.


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Worldwide change is making freshwater species being lost twice as quick as in some other environment. A new research, which considered Welsh rivers and streams for more than 30 years, has discovered that the quantity of expert spineless creatures is waning.

Cardiff University scientists checked fourteen streams at the Llyn Brianne Observatory, gathering information from the headwaters of the River Tywi in Wales since 1981. The information uncovered that expert living beings, as savage flatworms, certain stoneflies or caddis hatchlings, are in a sharp decrease, as their exact needs roll out them helpless against improvements in the atmosphere.

Not exclusively is the adjustment in their condition making their numbers diminish, however, once these species turn out to be rare they have restricted capacity to recolonize their beforehand involved territories.

Professor Steve Ormerod, Cardiff University School of Biosciences, said: “Freshwater ecologists are seriously concerned at the plight of the world’s rivers, lakes and wetlands, and at the rate at which they’re losing plants and animals of many types.”

“Yet, many people are unaware of this ongoing tragedy hidden beneath the water surface. Our results show that the build-up to species extinction can start in a subtle way, for example, where climate change causes numbers to decline before the sudden disappearance.”

“We’ve already lost one species like this across large areas of Wales, the flatworm Crenobiaalpine, whose specialism is predation in cool-water streams.”

Dr. Stefano Larsen, University of Trento, added: “Species extinction is now a major global issue, but is seen mostly as large-scale changes where whole habitats are lost, invaded by non-native species, polluted or over-exploited.”

“Local trends have been less clear, particularly from long-term studies at sites like Llyn Brianne, where the absence of serious ecological disruption means that more subtle changes are visible.”

“Our study shows how species with special ecological needs progressively form a smaller and smaller proportion of the species in our study streams, and there is a risk of them disappearing altogether.”


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