The Partitioning of Flowering Century Plants by Black-Chinned and Lucifer Hummingbirds

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Abstract
Feeding habits and aggressive abilities of black-chinned hummingbirds (Archilochus alexandri) and lucifer hummingbirds (Calothorax lucifer) at flowering century plants (Agave havardiana Trel.) were examined. Archilochus males established territories at Agave in open microhabitats while most Calothorax were non-territorial and foraged at undefended Agave in densely-vegetated sites. Variations in the foraging behaviors of the birds coincided with annual fluctuations in the resource base. Despite such variations, partitioning of Agave by both species was maintained by the aggressiveness of dominant Archilochus males.

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