Global patterns of phylogenetic relatedness of invasive flowering plants

Abstract

AimThe ability of predicting which naturalized non‐native species are likely to become invasive can help manage and prevent species invasions. The goal of this study is to test whether invasive angiosperm (flowering plant) species are a phylogenetically clustered subset of naturalized species at global, continental and regional scales, and to assess the relationships of phylogenetic relatedness of invasive species with climate condition (temperature and precipitation).LocationGlobal.Time periodCurrent.TaxonAngiosperms (flowering plants).MethodsThe globe is divided into 290 regions, which are grouped into seven biogeographic (continental) regions. Two phylogenetic metrics (net relatedness index and nearest taxon index), which represent different evolutionary depths, are used to quantify phylogenetic relatedness of invasive angiosperms, with respect to different tailor‐made species pools. Phylogenetic relatedness of invasive angiosperms is related to climatic variables.ResultsThe global assemblage of invasive angiosperm species is a strongly phylogenetically clustered subset of the species of the entire global angiosperm flora. Most invasive angiosperm assemblages are a phylogenetically clustered subset of their respective naturalized species pools, and phylogenetic clustering reflecting shallow evolutionary history is greater than that reflecting deep evolutionary history. In general, the phylogenetic relatedness of invasive species is greater in regions with lower temperature and precipitation across the world.Main conclusionsThe finding that invasive angiosperm assemblages across the globe are, in general, phylogenetically clustered subsets of their respective naturalized species pools has significant implications in biological conservation, particularly in predicting and controlling invasive species based on phylogenetic relatedness among naturalized species.

Darwin’s naturalization conundrum: an unsolved paradox in invasion ecology

“…因此, 在恶劣和干扰强 度大的环境下, 近缘种通常更容易共存, 而在适宜的 环境下, 远缘种反而更容易共存 [86] . 基于群落谱系结 构的分析也显示, 随着环境恶劣程度和人类干扰强度 的增加, 无论是本地种还是外来种, 其内部的谱系距 离显著减小, 谱系结构趋于聚集 [66,87] . .…”