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Challenges of Using Bioacoustics to Globally Monitor Bats

Abstract

As bats are important biodiversity indicators, monitoring their populations is becoming increasingly important to understand the impacts of global change. Bats leak information about themselves into the environment in the form of ultrasonic calls. Using these calls to globally survey bat populations may offer a more efficient alternative or addition to traditional methods for bat monitoring. We identify three of the most important challenges to the development of a global acoustic bat monitoring programme: the robust identification of acoustic signals, the ability to develop meaningful population trends from acoustic activity, and engaging a global audience to take part. We discuss the rapid progress in all three of these areas, for example, development of comprehensive call libraries, quantitative regional tools for call identification, new statistical methods to monitor trends and a resurgence of interest in the public participation in science and monitoring of nature. We also discuss the important gaps in our knowledge and where resources could be best focused to build a global programme. Specifically, tropical areas present a particular challenge: they have high species-richness; species acoustic diversity is poorly documented; call similarity of species is very high, making robust call identification more challenging; and traditionally these areas have had a lower citizen engagement in biodiversity monitoring.

Keywords

  • Discrete Wavelet Transform
  • Acoustic Signal
  • Automate Speech Recognition
  • Discriminant Function Analysis
  • Echolocation Call

These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Acknowledgments

We thank Michel Barataud, Roger Coles, Christian Dietz, Brock Fenton, Dai Fukui, Gareth Jones, David Jacobs, Richard Jenkins, Nancy Jennings, Elisabeth Kalko, Martin Obrist, Stuart Parsons, Sebastien Puechmaille, and Thomas Sattler for contributing calls to EchoBank, Bernd Brandt for assistance using PhyloPars, and an anonymous reviewer and editor Rick Adams for invaluable comments on a previous version of this manuscript.

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Correspondence to Kate E. Jones .

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Walters, C.L., Collen, A., Lucas, T., Mroz, K., Sayer, C.A., Jones, K.E. (2013). Challenges of Using Bioacoustics to Globally Monitor Bats. In: Adams, R., Pedersen, S. (eds) Bat Evolution, Ecology, and Conservation. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-7397-8_23

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