摘要
Theory predicts trade-offs between pre- and post-copulatory sexually selected traits. This relationship may be mediated by the degree to which males are able to monopolize access to females, as this will place an upper limit on the strength of post-copulatory selection. Furthermore, traits that aid in mate monopolization may be costly to maintain and may limit investment in post-copulatory traits, such as sperm performance. Australian painted dragons are polymorphic for the presence or absence of a yellow gular patch (‘bibs’), which may aid them to monopolize access to females. Previous work has shown that there are physiological costs of carrying this bib (greater loss of body condition in the wild). Here, we show that male painted dragons use this bright yellow bib as both an inter- and intrasexual signal, and we assess whether this signal is traded off against sperm performance within the same individuals. We found no relationship between aspects of bib colour and sperm swimming velocity or percentage of motile sperm and suggest that the bib polymorphism may be maintained by complex interactions between physiological or life-history traits including other sperm or ejaculate traits and environmental influences.
摘要译文
理论预测前后交配性选择性状之间的权衡。这种关系可能由男性能够垄断女性获得的程度来调解，因为这将为后交配选拔的实力提供上限。此外，帮助配偶垄断的特征可能维持成本高昂，并可能限制后交配性状的投资，如精子表现。澳大利亚画龙是多态的，存在或不存在黄色斑块（“bib”），这可能有助于他们垄断对女性的访问。以前的工作表明，携带这种围are的生理成本（野外的身体状况更大）。这里，我们显示，男性绘画的龙使用这个明亮的黄色围兜作为一个inter-和interxxual信号，并且我们评估这个信号是否与同一个人的精子表现相反。并且建议双边多态性可以通过包括其他精子或射精性状在内的生理或生命史特征与环境影响之间的复杂相互作用来维持。
C. S. McDiarmid[1]; C. R. Friesen[1,*]; C. Ballen[2] and M. Olsson[3];. Sexual coloration and sperm performance in the Australian painted dragon lizard, Ctenophorus pictus[J]. Journal of Evolutionary Biology, 2017,30(7): 1303-1312