Rapid, complete reproductive isolation in two closely related Zosterops White-eye bird species despite broadly overlapping ranges
Rapid, complete reproductive isolation in two closely related Zosterops White-eye bird species despite broadly overlapping ranges
复制标题
DOI：
10.1111/evo.13797
复制
发表时间：
2019-07-22
期刊：
影响因子：
3.3
通讯作者：
Uy, J. Albert C.
中科院分区：
文献类型：
--
作者：
Cowles, Sarah A.;Uy, J. Albert C.
研究当两个密切相关的物种进行二次接触时会发生什么，可以深入了解物种形成过程的后期阶段。鸟类的Zosteropidae家庭是最迅速的物种分化的脊椎动物谱系之一。这个家族的成员是高度流动的，地理分布广泛，提出了一个问题，即如果种群很容易进行二次接触，那么分歧是如何发生的。在Kolombangara小岛上，有两种密切相关的非姐妹种白眼鱼，Zosterops kulambangeli和Zosterops murphyi，沿着海拔梯度分布，并在中海拔地区进行二次接触。我们沿沿着两条海拔样带捕获了这两个物种的134个个体。使用基因分型测序数据和线粒体标记，我们没有发现过去杂交事件的证据和物种边界的强烈持久性，即使物种只有大约200万年的分歧。我们探讨潜在的生殖障碍，使这两个物种共存的同域，包括交配前的隔离的基础上分歧的羽毛和歌曲。我们还进行了文献综述，以确定在同源鸟类物种/亚种的二次接触中进化完全生殖隔离所需的时间（仅限于同源类群是parapatric或具有杂交区的情况），发现我们的研究是在鸟类基因组背景下研究完全生殖隔离的最年轻的例子之一。
Examining what happens when two closely related species come into secondary contact provides insight into the later stages of the speciation process. The Zosteropidae family of birds is one of the most rapidly speciating vertebrate lineages. Members of this family are highly vagile and geographically widespread, raising the question of how divergence can occur if populations can easily come into secondary contact. On the small island of Kolombangara, two closely related nonsister species of white-eyes, Zosterops kulambangrae and Zosterops murphyi, are distributed along an elevational gradient and come into secondary contact at mid-elevations. We captured 134 individuals of both species along two elevational transects. Using genotyping-by-sequencing data and a mitochondrial marker, we found no evidence of past hybridization events and strong persistence of species boundaries, even though the species have only been diverging for approximately 2 million years. We explore potential reproductive barriers that allow the two species to coexist in sympatry, including premating isolation based on divergence in plumage and song. We also conducted a literature review to determine the time it takes to evolve complete reproductive isolation in congeneric avian species/subspecies in secondary contact (restricted to cases where congeneric taxa are parapatric or have a hybrid zone), finding our study is one of the youngest examples of complete reproductive isolation studied in a genomic context reported in birds.