Territorial breakdown of black-capped chickadees, Poecile atricapillus, in disturbed habitats?

Article Abstract:

The hypothesis that in suboptimal habitats, the cost of defense might be prohibitively large compared to the associated benefits, and territorial behavior might be expected to decline is tested in a population of black-capped chickadees breeding in adjacent habitats. Results suggest that the quality of the disturbed habitat might be sufficiently low so as to make normal levels of exclusive defense cost inefficient.

Bird populations, Territoriality (Zoology), Animal territoriality

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Song repertoire evolution and acoustic divergence in a population of black-capped chickadees, poecile atricapillus

Article Abstract:

The singing behavior of populations of black-capped chickadees in Fort Collins, Colorado that represents the apparent evolution of a repertoire of song types is described. The findings indicate that social pressures exist in black-capped chickadees that favor individual birds that sound similar to other conspecifics.

Colorado, Environmental aspects, Black-capped chickadee, Black capped chickadee, Bird songs, Fort Collins, Colorado

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Photoperiodic regulation of food storing and hippocampus volume in black-capped chickadees, Poecile articapillus

Article Abstract:

The photoperiodic regulation of food storing and hippocampus volume in black-capped chickadees is studied. The results indicate that long days inhibit storing regardless of gonadal condition.

Animal behavior, Animal behaviour, Food storage, Animal feeding behaviour, Animal feeding behavior

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