COMMON BLUE Polyommatus icarus
The maps indicate a fairly stable general distribution whichisprobably correct, and the seeming coastal bias in west Lancashire is probably correct also. The butterfly favours limestone, though it will use other habitats if there are suitable hostplants.
THE THREE PERIODS COMPARED
PERIOD 1 (1940-1994) WITH RECORDING COVERAGE, ALTITUDE AND URBAN COVER
PERIOD 2 (1995-2000) WITH RECORDING COVERAGE, ALTITUDE AND URBAN COVER
PERIOD 3 (2001-2007) WITH RECORDING COVERAGE, ALTITUDE AND URBAN COVER
