Northern Mockingbird and Swamp Sparrow Overwinter in Calgary
نویسندگان
چکیده
منابع مشابه
Macrogeographic Vocal Variation in Subspecies of Swamp Sparrow
Variation in song can play a central role in species and subspecies recognition among birds. The ability of individuals to distinguish between songs of their own versus songs of a different subspecies potentially strengthens local adaptation of subspecific populations. We investigated the degree of vocal divergence and discrimination between two subspecies of Swamp Sparrow (Melospiza georgiana)...
متن کاملAdaptations to Tidal Marshes in Breeding Populations of the Swamp Sparrow’
The Coastal Plain Swamp Sparrow (Melospiza georgiana nigrescens) was originally described from a small number of specimens from the tidal marshes of the Nanticoke River in southeastern Maryland. Based on our quantitative analysis of a larger series of specimens, we found that Swamp Sparrows collected during the breeding season from the Chesapeake and Delaware bays (and tributaries) and near the...
متن کاملDistribution, Abundance, and Habitat Affinities of the Coastal Plain Swamp Sparrow
—We examined the distribution and abundance of the Coastal Plain Swamp Sparrow (Melospiza georgiana nigrescens) at previously occupied sites and points within potential habitat. We found Swamp Sparrows throughout their formerly documented range except in southern Chesapeake Bay. Swamp Sparrows were most common in the Mullica River region of New Jersey where we detected individuals at 78% of sys...
متن کاملSensory Constraints on Birdsong Syntax: Neural Responses to Swamp Sparrow Songs with Accelerated Trill Rates.
Both sensory and motor mechanisms can constrain behavioral performance. Sensory mechanisms may be especially important for constraining behaviors that depend on experience, such as learned birdsongs. Swamp sparrows learn to sing by imitating the song of a tutor, but sparrows fail to accurately imitate artificial tutor songs with abnormally accelerated trills, instead singing brief and rapid tri...
متن کاملTwo-voice complexity from a single side of the syrinx in northern mockingbird Mimus polyglottos vocalizations.
The diverse vocal signals of songbirds are produced by highly coordinated motor patterns of syringeal and respiratory muscles. These muscles control separate sound generators on the right and left side of the duplex vocal organ, the syrinx. Whereas most song is under active neural control, there has been a growing interest in a different class of nonlinear vocalizations consisting of frequency ...
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ژورنال
عنوان ژورنال: Blue Jay
سال: 1991
ISSN: 2562-5667,0006-5099
DOI: 10.29173/bluejay5181