Abstract
We report on a long-term study of the flower preferences of feeding adult butterflies undertaken in the Wyre Forest, UK. Examination of 5638 observations of nectar-feeding clearly demonstrates several findings: (i) that butterflies differ in their range of flower use, some are generalists and others specialists, respectively, exploiting more or less sources than expected; (ii) certain flower species are preferred over others. We find that (iii) generalism and specialism in flower use corresponds to generalism and specialism, respectively, in larval host range and biotope occupancy; that (iv) generalism in flower use is accounted for by life history and resource variables that increase opportunity for contact with a wider variety of flowering herbs; that (v) specialist flower users are more typically woodland butterflies and generalist flower users species of more open biotopes. A key finding is that (vi) many specialist flower users are butterfly species of conservation concern listed in Biodiversity Action Plans. We suggest that management of woodland sites for butterfly conservation should give as much consideration to nectar sources as to host plant sources.
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