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Ultrasonic communication in frogs.

Albert S Feng1, Peter M Narins, Chun-He Xu

  • 1Department of Molecular and Integrative Physiology & Beckman Institute, University of Illinois, Urbana, Illinois 61801, USA. afeng1@uiuc.edu

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|March 17, 2006
PubMed
Summary
This summary is machine-generated.

Ultrasonic communication and hearing were discovered in the concave-eared torrent frog (Amolops tormotus), an amphibian. This challenges the notion that only mammals use ultrasound for communication, likely evolving to overcome noisy stream environments.

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Area of Science:

  • Bioacoustics
  • Animal Communication
  • Evolutionary Biology

Background:

  • Ultrasonic sound production and detection (>20 kHz) were previously known only in a few mammal groups (bats, cetaceans, rodents).
  • Most amphibians, reptiles, and birds have limited hearing (<12 kHz).
  • The concave-eared torrent frog (Amolops tormotus) inhabits noisy, fast-flowing streams.

Purpose of the Study:

  • To investigate ultrasonic communication and hearing in the amphibian Amolops tormotus.
  • To determine if ultrasonic vocalizations are used for communication or are a byproduct of sound production.
  • To understand the evolutionary drivers for ultrasonic capabilities in this species.

Main Methods:

  • Field acoustic playback experiments in the natural habitat of Amolops tormotus.
  • Analysis of vocalizations for ultrasonic components.
  • Electrophysiological recordings of auditory midbrain responses.

Main Results:

  • Amolops tormotus males produce bird-like calls with ultrasonic frequencies.
  • Both audible and ultrasonic components of calls elicited vocal responses from males.
  • Auditory midbrain confirmed ultrasonic hearing capacity in Amolops tormotus and a sympatric species.

Conclusions:

  • Amphibians possess ultrasonic communication and hearing capabilities, previously thought to be limited to mammals.
  • The evolution of ultrasonic capabilities in Amolops tormotus is likely a response to intense low-frequency ambient noise.
  • This represents an independent evolution of ultrasonic perception in a distinct vertebrate lineage.