Diversification in sexual signals is often taken as evidenee for the importance of sexual selection in speciatio n.However,in order for sexual selection to gen erate reproductive isolati on between populations,both si...Diversification in sexual signals is often taken as evidenee for the importance of sexual selection in speciatio n.However,in order for sexual selection to gen erate reproductive isolati on between populations,both signals and mate preferences must diverge together.Furthermore,assortative mating may result from multiple behavioral mecha nisms,in eluding female mate pref ere nces,male mate preferences,and male-male competition;yet their relative contributions are rarely evaluated.Here,we explored the role of mate pref ere nces and male competitive ability as pote ntial barriers to gene flow between 2 diverge nt lineages of the taw ny dragon lizard,Ctenophorus decresii,which differ in male throat coloration.We found stronger behavioral barriers to pairings between southern lineage males and northern lineage females than between northern males and southern females,indicating incomplete and asymmetric behavioral isolating barriers.These results were driven by both male and female mate preferences rather than lineage differences in male competitive ability.In trasexual selecti on is therefore un likely to drive the outcome of sec on dary contact in C.decresii,despite its widely ack no wledged importa nee in lizards.Our results are consiste nt with the emergi ng view that although both male and female mate pref ere nces can diverge alongside sexual signals,speciation is rarely driven by divergent sexual selection alone.展开更多
基金Permits and ethics approval to perform the research were obtained from The University of Melbourne Animal Ethics Committee(1413220.3)the South Australian Wildlife Ethics Committee(25/2015)+1 种基金the South Australian Department of Environment,Water and Natural Resources(Q26428-2)the Victorian Department of Environment,Land,Water and Planning(10007751).This work was supported by funding from the Australian Research Council(DP150101044)to D.S.-F.
文摘Diversification in sexual signals is often taken as evidenee for the importance of sexual selection in speciatio n.However,in order for sexual selection to gen erate reproductive isolati on between populations,both signals and mate preferences must diverge together.Furthermore,assortative mating may result from multiple behavioral mecha nisms,in eluding female mate pref ere nces,male mate preferences,and male-male competition;yet their relative contributions are rarely evaluated.Here,we explored the role of mate pref ere nces and male competitive ability as pote ntial barriers to gene flow between 2 diverge nt lineages of the taw ny dragon lizard,Ctenophorus decresii,which differ in male throat coloration.We found stronger behavioral barriers to pairings between southern lineage males and northern lineage females than between northern males and southern females,indicating incomplete and asymmetric behavioral isolating barriers.These results were driven by both male and female mate preferences rather than lineage differences in male competitive ability.In trasexual selecti on is therefore un likely to drive the outcome of sec on dary contact in C.decresii,despite its widely ack no wledged importa nee in lizards.Our results are consiste nt with the emergi ng view that although both male and female mate pref ere nces can diverge alongside sexual signals,speciation is rarely driven by divergent sexual selection alone.
