Acoustically eavesdropping bat predators take longer to capture katydid prey signalling in aggregation

Prakash, H and Greif, S and Yovel, Y and Balakrishnan, R (2021) Acoustically eavesdropping bat predators take longer to capture katydid prey signalling in aggregation. In: Journal of Experimental Biology, 224 (10).

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Abstract

Prey that are signalling in aggregation become more conspicuous with increasing numbers and tend to attract more predators. Such grouping may, however, benefit prey by lowering the risk of being captured because of the predator�s difficulty in targeting individuals. Previous studies have investigated anti-predatory benefits of prey aggregation using visual predators, but it is unclear whether such benefits are gained in an auditory context. We investigated whether katydids of the genus Mecopoda gain protection from their acoustically eavesdropping bat predator Megaderma spasma when calling in aggregation. In a choice experiment, bats approached calls of prey aggregations more often than those of prey calling alone, indicating that prey calling in aggregation are at higher risk. In prey capture tasks, however, the average time taken and the number of flight passes made by bats before capturing a katydid were significantly higher for prey calling in aggregation than when calling alone, indicating that prey face lower predation risk when calling in aggregation. Another common anti-predatory strategy, calling from within vegetation, increased the time taken by bats to capture katydids calling alone but did not increase the time taken to capture prey calling from aggregations. The increased time taken to capture prey calling in aggregation compared with solitary calling prey offers an escape opportunity, thus providing prey that signal acoustically in aggregations with anti-predatory benefits. For bats, greater detectability of calling prey aggregations is offset by lower foraging efficiency, and this trade-off may shape predator foraging strategies in natural environments. © 2021. Published by The Company of Biologists Ltd.

Item Type:	Journal Article
Publication:	Journal of Experimental Biology
Publisher:	Company of Biologists Ltd
Additional Information:	The copyright for this article belongs to Company of Biologists Ltd
Keywords:	article; foraging; nonhuman; predation risk; predator; prey capture; signal transduction; Tettigoniidae; vampire bat; vegetation
Department/Centre:	Division of Biological Sciences > Centre for Ecological Sciences
Date Deposited:	19 Aug 2021 09:42
Last Modified:	19 Aug 2021 09:42
URI:	http://eprints.iisc.ac.in/id/eprint/69262

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