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Playing it safe? Behavioural responses of mosquito larvae encountering a fish predator

Chandrasegaran, Karthikeyan and Singh, Avehi and Laha, Moumita and Quader, Suhel (2018) Playing it safe? Behavioural responses of mosquito larvae encountering a fish predator. In: ETHOLOGY ECOLOGY & EVOLUTION, 30 (1). pp. 70-87.

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Official URL: http://dx.doi.org/10.1080/03949370.2017.1313785

Abstract

Predation is a strong selective force that affects prey population and ecosystem dynamics. Detecting predators and associated levels of threat is crucial to prey responses. Once a predator is detected, anti-predatory responses improve the chances of survival of prey. We used Aedes aegypti larvae to study behavioural responses to predation threat from guppies (Poecilia reticulata). Specifically, we tested the relative importance of chemical cues, both in isolation and in combination with physical cues, in eliciting anti-predatory behaviours. Larvae responded more strongly, by reducing the lengths of their wriggle bursts, when presented with a combination of chemical and physical cues than with chemical cues alone. Anti-predatory responses often come with an associated cost, and we expect that the ability to pay these costs should influence responses to predation risk. To test this, we compared wriggling patterns of satiated vs starved larvae in the same experiment. We found that, under predation risk, starved larvae were willing to take more risks than satiated larvae were. We sought to experimentally test the assumption that anti-predator behaviours increase the survival of prey. To do this, starved guppies were made to choose between displays of simulated larvae, moving in short and long wriggle bursts as observed in the previous experiment. The fish preferentially attacked larvae moving in long bursts, demonstrating the survival value of the larval anti-predatory response of shifting to a preponderance of short wriggle bursts. Our study identifies specific ways in which trade-offs between predation risk and energetic costs could affect anti-predator behaviour.

Item Type: Journal Article
Additional Information: Copy right for this article belong to TAYLOR & FRANCIS LTD, 2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND
Department/Centre: Division of Biological Sciences > Centre for Ecological Sciences
Depositing User: Id for Latest eprints
Date Deposited: 16 Apr 2018 20:08
Last Modified: 16 Apr 2018 20:08
URI: http://eprints.iisc.ac.in/id/eprint/59606

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