Bat echolocation calls: adaptation and convergent evolution

Research output: Contribution to journalArticle (Academic Journal)peer-review

139 Citations (Scopus)

Abstract

Bat echolocation calls provide remarkable examples of ‘good design’ through evolution by natural selection. Theory developed from acoustics and sonar engineering permits a strong predictive basis for understanding echolocation performance. Call features, such as frequency, bandwidth, duration and pulse interval are all related to ecological niche. Recent technological breakthroughs have aided our understanding of adaptive aspects of call design in free-living bats. Stereo videogrammetry, laser scanning of habitat features and acoustic flight path tracking permit reconstruction of the flight paths of echolocating bats relative to obstacles and prey in nature. These methods show that echolocation calls are among the most intense airborne vocalizations produced by animals. Acoustic tracking has clarified how and why bats vary call structure in relation to flight speed. Bats using broadband echolocation calls adjust call design in a range-dependent manner so that nearby obstacles are localized accurately. Recent phylogenetic analyses based on gene sequences show that particular types of echolocation signals have evolved independently in several lineages of bats. Call design is often influenced more by perceptual challenges imposed by the environment than by phylogeny, and provides excellent examples of convergent evolution. Now that whole genome sequences of bats are imminent, understanding the functional genomics of echolocation will become a major challenge.
Translated title of the contributionBat echolocation calls: adaptation and convergent evolution
Original languageEnglish
Pages (from-to)905 - 912
Number of pages8
JournalProceedings of the Royal Society B: Biological Sciences
Volume274 (1612)
DOIs
Publication statusPublished - Apr 2007

Bibliographical note

Publisher: Royal Society

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