Publications

up to the challenge? hormonal and behavioral responses of free-ranging male cassin's sparrows, peucaea cassinii, to conspecific song playback.	the challenge hypothesis postulates that male vertebrates can respond to social challenges, such as simulated territorial intrusions, by rapidly increasing their concentrations of plasma androgens, such as testosterone (t). this increase may facilitate the expression of aggressive behavior and lead to persistence of this behavior even after withdrawal of the challenge, thus potentially promoting territoriality and the probability of winning future challenges. the scope of the challenge hypothesi ...	2012	22504307
restoration practices have positive effects on breeding bird species of concern in the chihuahuan desert.	woody plant encroachment into grasslands is a global concern. efforts to restore grasslands often assume that removal of woody plants benefits biodiversity but assumptions are rarely tested. in the chihuahuan desert of the southwestern united states, we tested whether abundances of grassland specialist bird species would be greater in plant communities resulting from treatment with herbicides to remove encroaching shrubs compared with untreated shrub-dominated areas that represented pre-treatmen ...	2014	32327918