Thursday, April 2, 2015

Blue-winged Warbler

I photographed this Blue-winged Warbler last spring. Elsewhere in this blog, I discussed the genetics of Blue-winged and Golden-winged warbler hybrids. Blue-winged numbers have greatly increased since their discovery. Because they prefer brushy scrublands, they benefited from the cutting of the Eastern forests and eventual abandonment of farmlands. As their numbers increased, their range expaned northward, often replacing the genetically similar Golden-winged Warbler (Gill et al. 2001). Only in recent years have populations declined, as a result of forest regeneration or urbanization of scrublands.

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