海岛植物区系的多样化已被广泛研究。然而,对岛礁辐射过程中环境生态位的作用研究较少。我们将种群遗传分析与物种分布模型相结合,以阐明遗传关系,多样化模式,物种生态位要求,和铯教派的守恒。Kunkeliella,金丝雀特有的一种稀有半寄生植物。
我们研究了拉帕尔马岛现存的三个铯物种和一个新的分类单元。我们开发了12个微卫星,进行了种群遗传分析,并研究了该群体的人口统计学历史。为了评估生态位保守主义在群体多元化中的作用,我们用四种算法进行了物种分布建模(ESM)。
所有物种对稀有特有物种都表现出中等的遗传多样性值。大加那利(GranCanaria)表现出高度分化,而T.succulentum,T.retamoides(特内里费岛),和LaPalma种群密切相关。随着殖民从东向西进行,血统可能经历了最近的多样化,和T.Canariense作为其他人的妹妹。我们发现了气候生态位的转变,类群在温度梯度上表现出不同的分布。有足够的证据将LaPalma种群描述为新物种。
我们描述了铯教派的进化史。Kunkeliella通过整合遗传和生态评估。我们的结果表明,该进化枝经历了最近的辐射过程,物种之间的生态位分化。结果增加了我们对岛屿辐射的了解,并将为研究物种的保护管理提供信息。
The diversification of island flora has been widely studied. However, the role of environmental niches in insular radiation processes has been less investigated. We combined population genetic analyses with species distribution modelling to clarify the genetic relationships, diversification patterns, species niche requirements, and conservation of Thesium sect. Kunkeliella, a clade of rare hemiparasitic plants endemic to the Canaries.
We studied the three extant Thesium species and a new taxon from La Palma Island. We developed 12
microsatellites and performed population genetic analysis and studied the demographic history of the group. To evaluate the role of niche conservatism in the diversification of the group, we performed species distribution modelling (ESM) with four algorithms.
All species presented moderate genetic diversity values for rare endemics. Thesium canariense (Gran Canaria) showed high differentiation, whereas T. subsucculentum, T. retamoides (Tenerife), and La Palma populations are closely related. The lineage may have undergone a recent diversification with colonization proceeding east to west, with T. canariense as sister to the others. We detected a climatic niche shift, as taxa showed different distributions across the temperature gradient. There is enough evidence to describe La Palma populations as a new species.
We characterized the evolutionary history of Thesium sect. Kunkeliella by integrating genetic and ecological assessments. Our results indicate that this clade has undergone a recent radiation process with niche differentiation among species. The results increase our knowledge about insular radiations and will inform the conservation management of the study species.