02627nas a2200241   4500008004100000022001300041245004800054210004800102260001600150300001600166490000700182520177900189100001901968700002101987700001902008700001802027700002102045700002102066700002502087700001702112700002302129856023302152       2014                        eng d  a0960982200aRapid Convergent Evolution in Wild Crickets0 aRapid Convergent Evolution in Wild Crickets  cJan-06-2014  a1369 - 13740 v243 a<p>The earliest stages of convergent evolution are difficult to observe in the wild, limiting our understanding of the incipient genomic architecture underlying convergent phenotypes [1, 2]. To address this, we capitalized on a novel trait, flatwing, that arose and proliferated at the start of the 21stcentury in a population of field crickets (Teleogryllus oceanicus) on the Hawaiian island of Kauai [3]. Flatwing erases sound-producing structures on male forewings. Mutant males cannot sing to attract females, but they are protected from fatal attack by an acoustically orienting parasitoid fly (Ormia ochracea). Two years later, the silent morph appeared on the neighboring island of Oahu. We tested two hypotheses for the evolutionary origin of flatwings in Hawaii: (1) that the silent morph originated on Kauai and subsequently introgressed into Oahu and (2) that flatwing originated independently on each island. Morphometric analysis of male wings revealed that Kauai flatwings almost completely lack typical derived structures, whereas Oahu flatwings retain noticeably more wild-type wing venation. Using standard genetic crosses, we confirmed that the mutation segregates as a single-locus, sex-linked Mendelian trait on both islands. However, genome-wide scans using RAD-seq recovered almost completely distinct markers linked with flatwing on each island. The patterns of allelic association with flatwing on either island reveal different genomic architectures consistent with the timing of two mutational events on the X chromosome. Divergent wing morphologies linked to different loci thus cause identical behavioral outcomes - silence - illustrating the power of selection to rapidly shape convergent adaptations from distinct genomic starting points.</p>
1 aPascoal, Sonia1 aCezard, Timothee1 aEik-Nes, Aasta1 aGharbi, Karim1 aMajewska, Jagoda1 aPayne, Elizabeth1 aRitchie, Michael, G.1 aZuk, Marlene1 aBailey, Nathan, W.  uhttps://linkinghub.elsevier.com/retrieve/pii/S0960982214005247https://api.elsevier.com/content/article/PII:S0960982214005247?httpAccept=text/xmlhttps://api.elsevier.com/content/article/PII:S0960982214005247?httpAccept=text/plain01933nas a2200265   4500008004100000022001300041245006000054210005900114260001600173300001400189490000800203520114200211653001901353653002901372653002701401653002401428653001601452653002201468653002101490100001901511700002401530700002501554700002201579856006601601       2017                        eng d  a0003347200aMate choice intensifies motor signalling in  Drosophila0 aMate choice intensifies motor signalling in Drosophila  cJan-11-2017  a169 - 1870 v1333 a<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>
10acourtship song10aDrosophila pseudoobscura10aexperimental evolution10ainterpulse interval10amate choice10amotor performance10asexual selection1 aDebelle, Allan1 aCourtiol, Alexandre1 aRitchie, Michael, G.1 aSnook, Rhonda, R.  uhttp://linkinghub.elsevier.com/retrieve/pii/S0003347217303019