Socially foraging bats discriminate between group members based on search-phase echolocation calls
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Animals have evolved diverse strategies to use social information for increasing foraging success and efficiency. Echolocating bats, for example, can eavesdrop on bats foraging nearby because they shift from search-phase calls to feeding buzzes when they detect prey. Feeding buzzes can directly convey information about prey presence, but it is unknown whether search-phase calls also convey social information. Here, we investigated whether search-phase echolocation calls, distinct calls produced by some bat species to scan large open areas for prey, can additionally convey individual identity. We tested this in Molossus molossus, a neotropical insectivorous bat that forages with group members, presumably to find ephemeral insect swarms more efficiently. We caught M. molossus from six different social groups and recorded their search-phase calls during a standardized release procedure, then recaptured and tested 19 marked bats with habituation–dishabituation playback experiments. We showed that they can discriminate between group members based on search-phase calls, and our statistical analysis of call parameters supported the presence of individual signatures in search-phase calls. Individual discrimination is a prerequisite of individual recognition, which may allow M. molossus to maintain contact with group members while foraging without using specialized signals for communication.
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KOHLES, Jenna E., Gerald G. CARTER, Rachel A. PAGE, Dina K. N. DECHMANN, 2020. Socially foraging bats discriminate between group members based on search-phase echolocation calls. In: Behavioral Ecology. Oxford University Press (OUP). 2020, 31(5), pp. 1103-1112. ISSN 1045-2249. eISSN 1465-7279. Available under: doi: 10.1093/beheco/araa056BibTex
@article{Kohles2020-10-12Socia-52267,
year={2020},
doi={10.1093/beheco/araa056},
title={Socially foraging bats discriminate between group members based on search-phase echolocation calls},
number={5},
volume={31},
issn={1045-2249},
journal={Behavioral Ecology},
pages={1103--1112},
author={Kohles, Jenna E. and Carter, Gerald G. and Page, Rachel A. and Dechmann, Dina K. N.}
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<dcterms:abstract xml:lang="eng">Animals have evolved diverse strategies to use social information for increasing foraging success and efficiency. Echolocating bats, for example, can eavesdrop on bats foraging nearby because they shift from search-phase calls to feeding buzzes when they detect prey. Feeding buzzes can directly convey information about prey presence, but it is unknown whether search-phase calls also convey social information. Here, we investigated whether search-phase echolocation calls, distinct calls produced by some bat species to scan large open areas for prey, can additionally convey individual identity. We tested this in Molossus molossus, a neotropical insectivorous bat that forages with group members, presumably to find ephemeral insect swarms more efficiently. We caught M. molossus from six different social groups and recorded their search-phase calls during a standardized release procedure, then recaptured and tested 19 marked bats with habituation–dishabituation playback experiments. We showed that they can discriminate between group members based on search-phase calls, and our statistical analysis of call parameters supported the presence of individual signatures in search-phase calls. Individual discrimination is a prerequisite of individual recognition, which may allow M. molossus to maintain contact with group members while foraging without using specialized signals for communication.</dcterms:abstract>
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