Botero-Delgadillo Esteban, Quirici Verónica, Poblete Yanina, Ippi Silvina, Kempenaers Bart, Vásquez Rodrigo A
Department of Behavioural Ecology and Evolutionary Genetics Max Plank Institute for Ornithology Seewiesen Germany.
Instituto de Ecología y Biodiversidad Departamento de Ciencias Ecológicas, Facultad de Ciencias Universidad de Chile Santiago Chile.
Ecol Evol. 2020 Sep 29;10(21):11861-11868. doi: 10.1002/ece3.6850. eCollection 2020 Nov.
Studies on extrapair paternity (EPP) are key to understanding the ecological and evolutionary drivers of variation in avian mating strategies, but information is currently lacking for most tropical and subtropical taxa. We describe the occurrence of EPP in two populations of a South American socially monogamous bird, the Thorn-tailed Rayadito, based on data from 266 broods and 895 offspring that were sampled during six breeding seasons in north-central and southern Chile. In the northern population, 21% of the broods contained at least one extrapair young and 14% of all offspring were sired by an extrapair male, while in the southern population, we detected extrapair offspring (EPO) in 14% of the broods, and 6% of all offspring were EPO. Variation in the frequency of EPP could stem from population differences in the duration of the breeding season or the density of breeding individuals. Other factors such as differences in breeding synchrony and variation in food availability need to be evaluated. More reports on EPP rates are necessary to determine the patterns of taxonomic and geographic variation in mating strategies in Neotropical birds, and to better understand the differences in ecological dynamics between northern and southern hemisphere populations.
对配偶外交配（EPP）的研究是理解鸟类交配策略变异的生态和进化驱动因素的关键，但目前大多数热带和亚热带类群缺乏相关信息。我们基于在智利中北部和南部六个繁殖季节采集的266窝巢和895只后代的数据，描述了南美一种社会一夫一妻制鸟类——刺尾蜂鸟两个种群中配偶外交配的情况。在北部种群中，21%的窝巢至少包含一只配偶外交配产生的幼鸟，所有后代中有14%是由配偶外雄性所生；而在南部种群中，我们在14%的窝巢中检测到了配偶外交配产生的后代（EPO），所有后代中有6%是EPO。配偶外交配频率的差异可能源于繁殖季节持续时间或繁殖个体密度的种群差异。其他因素，如繁殖同步性差异和食物可获得性变化，也需要进行评估。需要更多关于配偶外交配率的报告，以确定新热带界鸟类交配策略的分类学和地理变异模式，并更好地理解北半球和南半球种群之间生态动态的差异。
