Abstract
It was pointed out in Chapter Four that populations can be adapted in detail to the special environments of restricted habitats provided that they are isolated, but only to the average conditions of relatively extensive and diversified ones. Those situations were illustrated by the butterfly Maniola jurtina on large and small islands in the Isles of Scilly (pp. 61–77). Furthermore, clines may be formed if a large region is subdivided ecologically in such a way that the various parts are substantially greater than the range normally exploited by the individuals of a species (p. 47).
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