Monday, October 1, 2012

Philadelphia Vireo

This last week I banded a single Philadelphia Vireo. I have previously posted about separating Philadelphia and Warbling vireos. Moskoff and Robinson (2011) suggest that Philadelphia Vireos are also often confused with Red-eyed Vireos, both due to similar plumage and calls.

An ecological rule states that no two species can occupy the same niche, which is to say they can't exploit the same habitat in the same way. Philadelphia and Red-eyed Vireos come close to breaking that law. Philadelphia Vireos actively defend their territories against Red-eyes--in dense populations the two species may actually fight each other.  Philadelphia Vireos may avoid competition by utilizing areas not exploited by Red-eyes. The Philadelphia Vireo, although usually an inhabitant for younger forests, often forages higher in old-growth forests than does its competitor (Moskoff and Robinson 2011).

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