Subspecies differentiation in an enigmatic chaparral shrub species

Delimiting biodiversity units is difficult in organisms in which differentiation is obscured by hybridization, plasticity, and other factors that blur phenotypic boundaries. Such work is more complicated when the focal units are subspecies, the definition of which has not been broadly explored in the era of modern genetic methods. Eastwood manzanita (Arctostaphylos glandulosa Eastw.) is a widely distributed and morphologically complex chaparral shrub species with much subspecific variation that has proven challenging to categorize. Currently ten subspecies are recognized, however, many of them are not geographically segregated, and morphological intermediates are common. Subspecies delimitation is of particular importance in this species, as two of the subspecies are rare. The goal of this study was to apply an evolutionary definition of subspecies to characterize structure within Eastwood manzanita. We used publicly-available geospatial environmental data and reduced-representation gen...

在因杂交、表型可塑性及其他模糊表型边界的因素而掩盖分化进程的类群中，界定生物多样性单元颇具挑战。当研究焦点单元为亚种时，此类工作更为复杂——在现代遗传技术时代，亚种的定义尚未得到广泛探讨。伊斯特伍德熊果（Arctostaphylos glandulosa Eastw.）是一种分布广泛、形态复杂的灌丛灌木类群，其亚种间变异丰富，分类难度极大。目前该类群已被认定有10个亚种，但其中多数亚种并未在地理上相互隔离，且形态中间型个体十分常见。亚种界定对该类群尤为重要，因为其中两个亚种属于珍稀类群。本研究的目标是采用亚种的演化定义，解析伊斯特伍德熊果的种群结构。我们使用了公开可用的地理空间环境数据与简化基因组（reduced-representation gen）……