Talk: Weevils with weapons: alternative mating tactics & exaggerated trait evolution in brentine weevils

With the Lee Kong Chian Natural History Museum now located halfway across the Kent Ridge campus and the advent of common labs at S3 and S14, catching up with the rest of the NUS Biodiversity Crew isn’t as convenient as the corridor talk that used to happen at S2.

However, I learnt about Spider Lab’s new postdoctoral research fellow – Chrissie Painting – and her work in Singapore through twitter, where she frequently posts images of her field sightings, specimens, and quips about Science. Chrissie will be working on jumping spider sexual selection, and will be giving a talk as part of an existing series organised by Seshadri. Would try to catch this! Talk details below:

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Abstract

Many animal species have evolved weaponry as a means to resolve conflict between conspecifics in the acquisition of mates. In those species with high size variation, it is common for there to be alternative mating tactics, where dominant individuals behave differently to subordinate males during mate searching and copulation. Despite these alternative mating tactics, subordinate males are usually thought to have a lower mating success than dominant males, and are simply making the best of a bad situation. Males of the New Zealand giraffe weevil (Lasiorhynchus barbicornis) possess greatly elongated rostrums used as weapons during contests with other males for access to females. However, adult males are also highly size variable such that there is a 6-fold difference between the smallest and largest equivalent-aged individuals. I will discuss findings from my PhD research on the mating system of this species, in particular focusing on the evolution of flexible alternative mating tactics and our current evidence for sexual selection on male rostrum size. I will also highlight diversity in weaponry among other brentine weevils around the globe and our current research on these fascinating beetles.

Date: Wednesday 25th March 2015
Venue: Block S16 #04-31
Time: 4 pm to 5 pm
All are welcomed

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