SNP table and metadata for: Geographically consistent hybridization dynamics between the Black-crested and Tufted Titmouse with evidence of hybrid zone expansion

We studied hybridization between the Black-crested and Tufted titmouse
across two geographically distinct transects that differ in the timing of
secondary contact by hundreds to thousands of years. We found that
hybridization patterns correspond to localized hybrid swarms and that the
titmouse hybrid zone is likely slowly expanding over time, a product of
short post-natal dispersal distances coupled with weak or absent selection
against admixture.

本研究针对黑冠凤头山雀（Black-crested Titmouse）与簇绒山雀（Tufted Titmouse）之间的杂交现象开展研究，选取两条地理上相互独立的生态样带，二者的次生接触（secondary contact）时间相差数百至数千年。研究发现，其杂交模式呈现局域性杂交群（hybrid swarms）特征，该山雀杂交带（hybrid zone）大概率随时间缓慢扩张；这一现象是幼鸟产后扩散距离较短，且对基因混合（admixture）的选择压力微弱甚至不存在共同作用的结果。