Loyau Adeline, Jalme Michel Saint, Sorci Gabriele
Laboratoire de Parasitologie Evolutive, Université Pierre et Marie Curie, Paris, France.
Behav Processes. 2007 Jan 10;74(1):64-70. doi: 10.1016/j.beproc.2006.09.008. Epub 2006 Sep 30.
A lekking mating system is typically thought to be non-resource based with male providing nothing to females but genes. However, males are thought to clump their display sites on areas where they are more likely to encounter females, which may depend on non-defendable resource location. We tested this hypothesis on a feral population of peacocks. In agreement, we found that, within the lek, display site proximity to food resources had an effect on female visitation rate and male mating success. The attractiveness of display sites to male intruders was explained by the distance to the feeding place and by the female visitation rate. We randomly removed 29 territorial males from their display sites. Display sites that were more attractive to male intruders before removal remained highly attractive after removal and display sites closer to the feeding area attracted the attention of intruders significantly more after removal. Similarly, display sites that were more visited by females before removal remained more visited after removal, suggesting again that the likelihood of encountering females is determined by the display site location. Overall, these results are in agreement with non-defendable resources affecting lek spatial organization in the peafowl.
传统观点认为，求偶场交配系统通常并非基于资源，雄性除了基因之外不会为雌性提供任何东西。然而，人们认为雄性会将它们的展示地点聚集在更有可能遇到雌性的区域，这可能取决于不可防御的资源位置。我们在野生孔雀种群上对这一假设进行了测试。与此相符的是，我们发现，在求偶场内，展示地点与食物资源的接近程度对雌性的到访率和雄性的交配成功率有影响。展示地点对雄性入侵者的吸引力可以通过与觅食地点的距离以及雌性的到访率来解释。我们从它们的展示地点随机移除了29只领地雄性。移除之前对雄性入侵者更具吸引力的展示地点在移除后仍然极具吸引力，并且移除后更靠近觅食区域的展示地点明显更能吸引入侵者的注意。同样，移除之前雌性到访较多的展示地点在移除后仍然有更多雌性到访，这再次表明遇到雌性的可能性是由展示地点的位置决定的。总体而言，这些结果与不可防御的资源影响孔雀求偶场空间组织的观点相符。
