@article {52579,
	title = {Mate choice intensifies motor signalling in  Drosophila},
	journal = {Animal Behaviour},
	volume = {133},
	year = {2017},
	month = {Jan-11-2017},
	pages = {169 - 187},
	abstract = {<p>Mate choice has the potential to act on the evolution of motor performance via its direct influence on motor sexual signals. However, studies demonstrating this are rare. Here, we performed an in-depth analysis of Drosophila pseudoobscura courtship song rate, a motor signal under mate choice in this species, and analysed the response of this signal to sexual selection manipulation using experimental evolution. We show that manipulating the opportunity for sexual selection led to changes in song production rate and singing endurance, with males from the polyandrous populations producing faster song rates over longer time periods than males from monogamous populations. We also show that song rate was correlated with estimates of overall courtship vigour. Our results suggest that the action of mate choice on a motor signal has affected male motor performance displayed during courtship. We consider potential selective benefits associated with changes in motor performance, including condition- dependent signalling, and discuss the implications of these results for the study of motor signals un- der sexual selection.</p>
},
	keywords = {courtship song, Drosophila pseudoobscura, experimental evolution, interpulse interval, mate choice, motor performance, sexual selection},
	issn = {00033472},
	doi = {10.1016/j.anbehav.2017.09.014},
	url = {http://linkinghub.elsevier.com/retrieve/pii/S0003347217303019},
	author = {Debelle, Allan and Courtiol, Alexandre and Ritchie, Michael G. and Snook, Rhonda R.}
}
@article {52575,
	title = {Interactions between complex multisensory signal components result in unexpected mate choice responses},
	journal = {Animal Behaviour},
	volume = {134},
	year = {2017},
	month = {Jan-12-2017},
	pages = {239 - 247},
	abstract = {<p>Multimodal (multisensory) signalling is common in many species and often facilitates communication. How receivers integrate individual signal components of multisensory displays, especially with regard to variance in signal complexity, has received relatively little attention. In nature, male t\&uacute;ngara frogs, Physalaemus pustulosus, produce multisensory courtship signals by vocalizing and presenting their inflating and deflating vocal sac as a visual cue. Males can produce a simple call (whine only) or a complex call (whine \&thorn; one or more chucks). In a series of two-choice experiments, we tested female preferences for variation in acoustic call complexity and amplitude (unimodal signals). We then tested preferences for the same calls when a dynamic robotic frog was added to one call, generating a multi- modal stimulus. Females preferred a complex call to a simple call; when both calls contained at least one chuck, additional numbers of chucks did not further increase attractiveness. When calls contained zero or one chuck, the visual stimulus of the robofrog increased call attractiveness. When calls contained multiple chucks, however, the visual component failed to enhance call attractiveness. Females also preferred higher amplitude calls and the addition of the visual component to a lower amplitude call did not alter this preference. At relatively small amplitude differences, however, the visual signal increased overall discrimination between the calls. These results indicate that the visual signal component does not provide simple enhancement of call attractiveness. Instead, females integrate multisensory components in a nonlinear fashion. The resulting perception and behavioural response to complex signals probably evolved in response to animals that communicate in noisy environments.</p>
},
	keywords = {anurans, mate choice, multimodal signalling, nonlinear interactions, sexual selection, signal weighting, t{\'u}ngara frog, vocal sac},
	issn = {00033472},
	doi = {10.1016/j.anbehav.2016.07.005},
	url = {http://linkinghub.elsevier.com/retrieve/pii/S000334721630121X},
	author = {Stange, Nicole and Rachel A. Page and Michael J. Ryan and Taylor, Ryan C.}
}
