Boloria selene

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SMALL PEARL-BORDERED FRITILLARY Boloria selene

No doubt centuries ago this, and the other Heliconiinae ("Fritillaries"), must have had a continuous distribution, but only very isolated frgaments of that distribution now remain, in the Morecambe Bay limestone (SD47), near Quernmore (SD56) and at a single very small isolated site in mid-Cheshire.The populations that once existed at Delamere Forest and Wybunbury have died out.

On the Morecambe Bay limestone, the species is in competition with the next one, B. euphrosyne. I have only once seen B. selene there, and wonder whether the one species will out-compete the other to extinction. The habitat requirements are usually reckoned to be slightly different, B. selene favouring more open andless wooded biotopes, but there is much overlap. Currently all five resident British Heliconiines occur around Morecambe Bay, the only place in Britain where this occurs. but how long this situation can persist is another matter.

 

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

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