The descriptive text, below the map, is from the Cornish Red Data Book (2009). The map on this web page depicts the organisms distribution and shows the records made pre-2000 and those made since.
Range & Status
Found over most of Europe and widespread throughout mainland Britain where there is an estimated population of 95,000 in England, 4000 in Scotland and 15,000 in Wales (Harris et al .,1995). An increasing trend has emerged in the last 10 years (NBMP, 2008).
Thought to be less common in Cornwall where it has been found occasionally from east to west. The total population size is not known. This species is probably under-recorded. The increase in 1km squares from seven to 23 is likely to be in part due to increased recording effort but may also reflect the national reported increase.
Habitat & Ecology
Hunts over open water taking caddis flies, mayflies and other insects. In summer it roosts in tree holes, buildings, tunnels, underground sites and bridges. Hibernates mainly in underground sites. Emerges late dusk.
See Introduction. Roost disturbance, including re-pointing of stonework bridges, changes in water courses, water pollution and lighting of water course and associated structures.
Extensive legal protection detailed in Introduction. Not at risk of extinction worldwide (IUCN status, 2001).
I.J. Bennallick, S. Board, C.N. French, P.A. Gainey, C. Neil, R. Parslow, A. Spalding and P.E. Tompsett. eds. 2009. Red Data Book for Cornwall and the Isles of Scilly. 2nd Edition.Croceago Press.
The Cornish Red Data Book Project was led by the Cornwall and Isles of Scilly Federation for Biological Recorders (CISFBR). The full text and species accounts (minus the maps) are available on the CISFBR website.