Messages encoded in the songs of chestnut-sided warblers

Article Abstract:

A multivariate model of association was developed to analyze the different song categories of the chestnut-sided warbler and the information they carry. Results showed that accented-ending songs provide information about the singer's location, unmated status and interaction with females but unaccented-ending songs are associated with the singer's intention to move or to fight. Although useful, the findings of the study are not conclusive since other sets of behavioral possibilities need to be considered.

Birdsongs

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The effect of predation on begging-call evolution in nestling wood warblers

Article Abstract:

There is a strong interspecific link between nesting site and the frequency (pitch) of begging calls in wood warblers (Parulidae). Nesting site was also linked, to a lesser degree, with the rate of modulation of calls. It seems that the calls of ground-nesting warblers may be less likely to be detected by predators than those of tree-nesting birds. The calls of older ground-nesting warbler nestlings may also be harder to locate than the calls of tree nesters, as they show a lower rate of modulation.

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Burial of cowbird eggs by parasitized yellow warblers: an empirical and experimental study

Article Abstract:

The reaction of yellow warblers, Dendroica petechia, to naturally laid and experimentally introduced eggs of the brown-headed cowbird Molothrus ater, showed a dichotomy of reactions to cowbird parasitism which may be due to the big cost of rejection. Selection for rejection/acceptance may fluctuate over time as expenditure and merit of each strategy change with different environmental situations.

Analysis, Eggs, Eggs (Food), Parasitic birds, Cowbirds

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