Nesting mortality of Carolina Chickadees breeding in natural cavities

Article Abstract:

The effectiveness of hole-nesting in protecting against inclement weather and predation, thus assuring reproductive success, was investigated in the Carolina Chickadees (Parus carolinensis). Nest structure, which did not correlate with microclimate, did not have significant effects on nesting success. Predation accounted for all nest losses and most of the egg losses and chick mortality. Carolina Chickadees lose the best nest holes to more aggressive species, but have greater flexibility in nest site selection and are able to renest rapidly after nest destruction.

Environmental aspects, Nest building

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Relative frequency parameters and song recognition in Black-capped Chickadees

Article Abstract:

Experiments were conducted to analyze the song recognition ability of male Black-capped Chickadees (Parus atricapillus). Three playback songs were synthesized and played in two Chickadee colonies in Canada, in 1991. Results showed that Black-capped Chickadees responded to songs with a glissando in the first note more than they did to songs which did not have a glissando. Although minor variations in pitch interval did not greatly hinder the process of song recognition, the decline in note frequency was used by Chickadees for distance estimation.

Canada, Ornithological research, Black-capped chickadee, Black capped chickadee

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The loss of avian cavities by injury compartmentalization in a primeval European forest

Article Abstract:

A study of avian cavity dynamics in the Bialowieza National Park, Poland, revealed that cavity loss as a consequence of injury compartmentalization did not unduly impact the nature of distribution or density of secondary cavity nesters in the forest zone. Of the 620 cavities in living mediums from a sum total of 983 substrates, only 5% were lost as a result of compartmentalization.

Poland, Natural resources, Habitats, Birds

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