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Why The Swamp Sparrow Is Hitting The High Notes

Date:
January 12, 2009
Source:
University of Miami
Summary:
Scientists have long thought that a bird's vocal performance is a static characteristic-set once a song is learned. Yet, biologists now explain that songbirds can modulate vocal performance, when it is important to do so.

This small songbird with gray face and reddish wings defends his territory and attracts a mate usually by singing from a raised perch in a brushy swamp.
Credit: Robert Lachlan

Birdsongs are used extensively as models for animal signaling and human speech, offering a glimpse of how our own communicating abilities developed. A new study by Adrienne DuBois, a graduate student at the University of Miami (UM) College of Arts and Sciences Department of Biology, shows that the Swamp Sparrow has the ability to emit songs that are physically difficult to produce during hostile situations, implying that songbirds use sophisticated vocal performances as signals in aggressive communication.

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The findings contribute to the current understanding of how animals use signals to communicate.

DuBois investigated whether vocal performance (a measure of how well a male sings songs that are difficult to produce) is used as a signal in aggressive interactions between male songbirds. The study reveals that, when challenged, the male Swamp Sparrow escalates its vocal performance by increasing the frequency range and the speed of its song.

"Vocal performance was thought to be a static characteristic—set once a song is learned," DuBois said. "Our results are the first to show that songbirds can modulate vocal performance, when it is important to do so."

Theoretically, only males with better genes, or that are in better condition, should be able to produce high performance songs. However, the study found that males are able to increase their vocal performance when challenged by a competitor, explained Bill Searcy, Maytag professor of Ornithology in the UM College of Arts and Science and co-author of the study.

"Even in the case of signals whose properties are physically constrained to reflect an individual's abilities, animals exaggerate their signals as much as they can, during critical situations," Searcy said.

The slow trills of the Swamp Sparrows can be heard during spring and summer across the Eastern and Central North American wetlands. This small songbird with a grey face and reddish wings defends his territory and attracts a mate usually by singing from a raised perch in a brushy swamp.

Results from research on birdsong can be extrapolated to other areas of study, including the evolution of communication, and animal cognition, explained Steve Nowicki, Duke University professor, dean of Undergraduate Education and co-author of the study.

"By understanding what animals do in their natural environment, we get a glimpse of what their brains can do," said Nowicki, "In a broader sense, we can make assumptions about the way the animal brain develops to support a complex communication system."

Songs of swamp sparrows.


Story Source:

The above story is based on materials provided by University of Miami. Note: Materials may be edited for content and length.


Journal Reference:

  1. DuBois et al. Swamp sparrows modulate vocal performance in an aggressive context. Biology Letters, 2009; 1 (-1): -1 DOI: 10.1098/rsbl.2008.0626

Cite This Page:

University of Miami. "Why The Swamp Sparrow Is Hitting The High Notes." ScienceDaily. ScienceDaily, 12 January 2009. <www.sciencedaily.com/releases/2009/01/090109125636.htm>.
University of Miami. (2009, January 12). Why The Swamp Sparrow Is Hitting The High Notes. ScienceDaily. Retrieved November 27, 2014 from www.sciencedaily.com/releases/2009/01/090109125636.htm
University of Miami. "Why The Swamp Sparrow Is Hitting The High Notes." ScienceDaily. www.sciencedaily.com/releases/2009/01/090109125636.htm (accessed November 27, 2014).

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