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Signal Perception in Frogs and Bats and the Evolution of Mating Signals

Signal Perception in Frogs and Bats and the Evolution of Mating Signals. Karin L. Akre , Hamilton E. Farris , Amanda M. Lea , Rachel A. Page , Michael J. Ryan. Introduction.

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Signal Perception in Frogs and Bats and the Evolution of Mating Signals

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  1. Signal Perception in Frogs and Bats and the Evolution of Mating Signals Karin L. Akre, Hamilton E. Farris, Amanda M. Lea, Rachel A. Page, Michael J. Ryan

  2. Introduction Mike J. Ryan, The Túngara Frog, A Study in Sexual Selection and Communication (Univ. of Chicago Press, Chicago, 1985). A. N. Popper, R. R. Fay, Eds., Hearing by Bats, Springer Handbook of Auditory Research (Springer-Verlag, New York, 1995).

  3. Introduction Tungara Frogs and Fringe-lipped(Frog-eating) Bats live in the same areas of South America The male frogs mating call is made of two sounds, a “whine” and a “chuck”

  4. Methods Wild-caught females were played differing male calls from two speakers. Choice was determined based on which speaker the females approached within 10 cm.

  5. Methods Wild-caught bats released into flight cage. Two speakers played differing male calls from different areas. Choice was determined by which speaker the bats flew within 1 m of during the calls.

  6. Results Preferentially approach complex calls. i.e Higher energy and higher difference in chucks

  7. Results

  8. Results Chuck Number Ratio has the most significant results. Natural selection probably not that strong on frog mating calls. Fixed difference of one chuck between neighbours.

  9. Discussion Female cognition affects how signal complexity develops through evolution as female attention tends to wane as calls become increasingly elaborate compared to neighbours. However, predation also constrains how elaborate a males song can be, so females choice may not be significant. Based on the data, signal elaboration more likely limited by attractiveness and predation as females are less attracted to calls past a certain complexity while bats are still attracted at that point.

  10. Future? Investigate other factors of male frog condition and how females can detect it.Light Levels Influence Female Choice in Túngara Frogs: Predation Risk Assessment?A. Stanley Rand, Maria Elena Bridarolli, Laurie Dries and Michael J. Ryan How does the frog-eating bats hunting strategy change when the breeding season is finished?

  11. Questions?

  12. References Additional Paper Light Levels Influence Female Choice in Túngara Frogs: Predation Risk Assessment?A. Stanley Rand, Maria Elena Bridarolli, Laurie Dries and Michael J. RyanPublished by:American Society of Ichthyologists and Herpetologists (ASIH) Stable URL: http://www.jstor.org/stable/1447770 Pictures: http://bcrc.bio.umass.edu/courses/fall2009/plsoilin/plsoilin190e/review/20091021/tungaraFrogBat.jpg http://psych.wisc.edu/marler/frogcall.jpg http://www.ruhr-uni-bochum.de/ecoevo/klhomepage/HPPpustulosus.jpg http://lh3.ggpht.com/-MKwJ7aGrasg/RquBQV8KH8I/AAAAAAAABMM/NuO7l-3p8kA/DSCF4189.JPG http://web5.cns.utexas.edu/news/2010/05/frog-man-cometh/ http://koshersamurai.wordpress.com/2011/08/19/females-can-limit-male-attractiveness/

  13. 1). Why are the differing auditory systems of the frogs and the bats a source of error in this experiment? 2). What evolutionary advantages/disadvantages would the introduction of a third call give to an individual male?

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