@article {50484,
	title = {Divergent mechanisms of acoustic mate recognition between closely related field cricket species ( Teleogryllus  spp.)},
	journal = {Animal Behaviour},
	volume = {130},
	year = {2017},
	month = {Jan-08-2017},
	pages = {17 - 25},
	abstract = {<p>Effective recognition of conspeci fi c mating signals reduces the risk of maladaptive hybridization. Dis- secting the signal recognition algorithms that underlie preferences is a useful approach for testing whether closely related taxa evaluate the same or different signal features to achieve mate recognition. Such data provide information about potential constraints and targets of selection during evolutionary divergence. Using a series of mate choice trials, we tested whether closely related, but genetically and phenotypically divergent, fi eld cricket species ( Teleogryllus oceanicus and Teleogryllus commodus ) use shared or distinct recognition algorithms when evaluating acoustic male calling songs. These species overlap in sympatry, show premating isolation based on female discrimination of male calling songs, yet are capable of producing hybrid offspring. Unexpectedly, female selectivity for features of male song differed between the two species. We found that the two species use a combination of shared and unique signal fi ltering mechanisms, and we characterized how information about male carrier frequency, pulse rate and temporal patterning is integrated to achieve song recognition in each species. These results illustrate how comparatively few, simple modi fi cations in key components of signal recognition algo- rithms can lead to striking interspeci fi c discrimination between closely related taxa, despite apparent signal complexity. The fi nding that some steps during signal recognition and fi ltering are shared between the species, while others differ, can help to identify behavioural traits targeted by selection during evolutionary divergence</p>
},
	keywords = {acoustic communication, divergence, female preference, mate recognition, reproductive isolation, sexual selection, speciation, Teleogryllus},
	issn = {00033472},
	doi = {10.1016/j.anbehav.2017.06.007},
	url = {http://linkinghub.elsevier.com/retrieve/pii/S0003347217301823},
	author = {Nathan W. Bailey and R. Matthias Hennig}
}
@article {47295,
	title = {Components of reproductive isolation between the closely related grasshopper species Chorthippus biguttulus and C. mollis},
	journal = {Behavioral Ecology and Sociobiology},
	volume = {71},
	year = {2017},
	month = {Jan-04-2017},
	abstract = {<p>The formation and maintenance of species in nature is accomplished by the evolution of reproductive isolating mechanisms. To understand patterns of speciation and coexistence between species, it is crucial to obtain a complete synopsis of reproductive isolating barriers. We identified multiple reproductive isolation barriers between two closely related species, Chorthippus biguttulus and Chorthippus mollis, and quantified their respective contributions to isolation. To this end, we produced hybrids and backcrosses in the laboratory to examine reproductive isolation at multiple stages in the life history. The prezygotic barriers, based on chemical and acoustic cues, are currently the strongest impediments to gene flow between C. biguttulus and C. mollis. This indicates an important role for sexual selection in the maintenance of species isolation. However, extrinsic and intrinsic postzygotic isolation barriers also contributed to reproductive isolation. The virtual sterility of F1 hybrid males was based on both the dysfunctionality of their testes and intermediate behavioral mating traits (behavioral sterility). This study demonstrates that a cascade of reproductive isolating mechanisms reduces the gene flow between C. biguttulus and C. mollis. Our results further demonstrate that the courtship display in these species consists of multimodal signals and indicates a key role of chemical cues in reproductive isolation and speciation in grasshoppers.</p>
},
	keywords = {Chorthippus, hybridization, reproductive isolation, speciation},
	issn = {0340-5443},
	doi = {10.1007/s00265-017-2295-3},
	url = {http://link.springer.com/10.1007/s00265-017-2295-3},
	author = {Finck, Jonas}
}
