The effect of climate on acoustic signals: does atmospheric sound absorption matter for bird song and bat echolocation?

The Journal of the Acoustical Society of America
Emilie C Snell-Rood

Abstract

The divergence of signals along ecological gradients may lead to speciation. The current research tests the hypothesis that variation in sound absorption selects for divergence in acoustic signals along climatic gradients, which has implications for understanding not only diversification, but also how organisms may respond to climate change. Because sound absorption varies with temperature, humidity, and the frequency of sound, individuals or species may vary signal structure with changes in climate over space or time. In particular, signals of lower frequency, narrower bandwidth, and longer duration should be more detectable in environments with high sound absorption. Using both North American wood warblers (Parulidae) and bats of the American Southwest, this work found evidence of associations between signal structure and sound absorption. Warbler species with higher mean absorption across their range were more likely to have narrow bandwidth songs. Bat species found in higher absorption habitats were more likely to have lower frequency echolocation calls. In addition, bat species changed echolocation call structure across seasons, using longer duration, lower frequency calls in the higher absorption rainy season. These resul...Continue Reading

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Citations

Aug 21, 2013·Behavioral Ecology and Sociobiology·Sarah R Partan
Dec 18, 2013·Journal of the Royal Society, Interface·Jinhong LuoHolger R Goerlitz
Jun 6, 2014·Integrative and Comparative Biology·Eli M Swanson, Emilie C Snell-Rood
Aug 3, 2017·The Journal of the Acoustical Society of America·Gloriana Chaverri, Oscar E Quirós
May 29, 2018·Zoology : Analysis of Complex Systems, ZACS·Chunmian ZhangJiang Feng

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