@article {Mendelson2006Closerange,
	title = {Close-range acoustic signaling and mate choice in Hawaiian crickets (Gryllidae: Laupala )},
	journal = {Behavioral Ecology and Sociobiology},
	volume = {59},
	number = {6},
	year = {2006},
	month = {April},
	pages = {770{\textendash}776},
	abstract = {Abstract\&nbsp;\&nbsp;Evolution of the mate recognition system (MRS) can play a central role in animal speciation. One dramatic consequence of changes in the MRS is the failure of individuals from divergent lineages to successfully court and mate, thereby reducing gene flow between these groups. Here, we test the role of an acoustic mating signal on mate choice in a Hawaiian cricket genus (Gryllidae: Laupala). Speciation in Laupala is proceeding at an extremely rapid rate, apparently driven by divergence in aspects of the mate recognition system, most conspicuously the pulse rate of male calling song. Previous studies demonstrate that females prefer the pulse rate of a conspecific male{\textquoteright}s song when perceived at long range, in laboratory phonotaxis trials. In this study, we examined mate choice in two species that differ dramatically in pulse rate: Laupala paranigra and Laupala kohalensis. We tested the female{\textquoteright}s preference in both species for pulse rates at close range, by providing females an opportunity to mate with hybrid males producing a range of intermediate pulse rates. Results of our study demonstrate that while strong behavioral barriers exist between these two species, variation in the pulse rate of male calling song did not predict female mate choice at close range. These results suggest a more complex architecture to mate recognition in Laupala than previously hypothesized.},
	keywords = {behaviour, communication, crickets, hawaii, orthoptera},
	doi = {10.1007/s00265-005-0107-7},
	url = {http://dx.doi.org/10.1007/s00265-005-0107-7},
	author = {Mendelson, Tamra and Shaw, Kerry}
}
@article {GeberzahnFemales,
	title = {Females alter their song when challenged in a sex-role reversed bird species},
	journal = {Behavioral Ecology and Sociobiology},
	year = {Submitted},
	abstract = {Abstract\&nbsp;\&nbsp;Birdsong serves to attract mates and to deter territorial rivals. Even though song is not restricted to males, this dual function has almost exclusively been demonstrated for male song. To test the generality of hypotheses on birdsong, we investigated female song in the sex-role reversed, classically polyandrous African black coucal (Centropus grillii) in the context of female{\textendash}female competition. We compared spontaneously vocalizing females with females vocally responding to a playback simulating a conspecific intruder. Females changed vocal parameters in response to playbacks: They lowered the pitch of their vocalizations and enhanced the duration of song elements when being challenged. Also, the composition of the vocalizations was altered. There was no significant correlation between pitch and body size parameters in spontaneous song, but there was for response songs, with larger females having a lower pitch. These changes in vocal properties suggest that the vocalizations are important for mutual assessment of competitive abilities in females. Our findings confirm the general role of intrasexual competition in vocal communication of birds.},
	keywords = {bioacoustics, birds, communication, song},
	doi = {10.1007/s00265-009-0836-0},
	url = {http://dx.doi.org/10.1007/s00265-009-0836-0},
	author = {Geberzahn, Nicole and Goymann, Wolfgang and Muck, Christina and ten Cate, Carel}
}
