Small grey sedge
The Small grey sedge is one of the eight rare and threatened riverflies which have been designated as conservation priorities by the UK Government and are listed on the UK Biodiversity Action Plan (BAP). This webpage gives details of the Small grey sedge and has links to more detailed documents.
Small grey sedge (Glossosoma intermedium)
Window winged sedge (Hagenella clathrata) © Ian Wallace
This caddisfly has been found in only four Lake District streams, however it has been lost at two of the four sites and another is in decline. It is suspected that cypermethrin sheep dips may have been responsible for one disappearance. The adults mainly emerge from the water and fly between April and May. Threats to this species include pollution from pesticides; nutrient enrichment from dams, sewage and farm run-off; siltation and disturbance from drainage works; and shading by afforestation.
To see the Small grey sedge (Glossosoma intermedium) Species Dossier click here.
To see the Small grey sedge (Glossosoma intermedium) Summary Sheet click here. To find out more about the Riverfly Partnership and the Riverfly BAP Project click here.