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Biosonar pp 195-229 | Cite as

On-Animal Methods for Studying Echolocation in Free-Ranging Animals

  • Mark Johnson
Chapter
Part of the Springer Handbook of Auditory Research book series (SHAR, volume 51)

Abstract

Although still relatively new, sound sampling tags are proving to be powerful tools for studying echolocation in the wild. Compared to remote camera or listening systems that receive only fleeting glimpses of individuals, a tag follows an animal for periods of hours as it navigates and forages in its natural environment. Sensors can be added to sample movements, physiological parameters, and the environment of the animal. Such multisensor sound tags have been used extensively on odontocetes enabling fine-scale studies of prey search, selection, and capture behaviors that are expanding our knowledge of species traditionally thought of as hard to study. Given the severe weight constraint on tags for bats, short-range telemetry devices are still the only option for on-animal sound sensing. These have been used to study signal adaptation in captive animals but telemetry range is limited for outdoors use.

On-animal sound recordings can be difficult to interpret because of the density of the data and because of limitations associated with the location of the tag on the animal. New creative ways to explore multidimensional datasets that convey also the uncertainties inherent in these data are essential to unlock the full potential of sound tags in echolocation studies. Standardized ways to exchange and compare data are also needed to combine the small numbers of tag deployments typically achievable into a larger ecological picture.

Keywords

Bats Echogram Event detection Foraging Movement sensors Sensor fusion Sound recording Sound-source parameters Tags Toothed whales Visualization 

Notes

Acknowledgements

Thanks to T. Horiuchi, P. Madsen, N. Aguilar, T. Hurst, and A. Surlykke for helpful discussions. Funds from the National Oceanographic Partnership Program, a Woods Hole Oceanographic Institution senior technical award, the Marine Alliance for Science and Technology, Scotland, and a Marie Curie Career Integration Grant, supported the preparation of this chapter.

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Copyright information

© Springer-Verlag New York 2014

Authors and Affiliations

  1. 1.Sea Mammal Research UnitUniversity of St. AndrewsSt. AndrewsScotland

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