Integrating historical biogeography and environmental niche evolution to understand the geographic distribution of Datureae
Integrating historical biogeography and environmental niche evolution to understand the geographic distribution of Datureae
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整合历史生物地理学和环境生态位演化来了解洋曼陀罗的地理分布
DOI：
10.1002/ajb2.1281
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发表时间：
2019
影响因子：
3
通讯作者：
Smith, Stacey D.
中科院分区：
文献类型：
--
作者：
Dupin, Julia;Smith, Stacey D.
前提植物进化枝的分布是由非生物和生物因素以及起源中心等历史因素决定的。当谱系在新环境中建立时，遥远地区之间的分散可能会导致生态位进化。或者，分散的谱系可能表现出利基保守主义，在具有相似环境条件的地区之间移动。在这里，我们在洋金科分支（茄科）中测试这些对比假设。方法我们使用最大似然法来估计洋金科的祖先范围以及生物地理事件的历史。然后，我们使用气候和土壤变量来描述每个分类单元的生态位，并测试环境生态位最佳值的变化。最后，我们研究了这些变化与洋金科内类群和进化枝的生态位宽度以及它们之间的重叠程度之间的关系。结果洋金科起源于安第斯山脉，随后将其范围扩展到北美和南美洲的非安第斯地区。大多数曼陀罗和龙贝属物种的祖先生态位是干燥的，而曼陀罗属物种可能转向更适宜的环境。尽管如此，今天大多数洋金科植物在生态位宽度上呈现出中等到高度的重叠。 结论 洋金科植物向北美的扩张与生态位保守主义有关，并扩散到与祖先谱系占据的类似干旱地区。随后的生态位演变，包括在Brugmansia中向中生态位的明显转变，使Datureae部落中的物种占据的栖息地范围多样化，但也导致三个属之间存在显着的生态位重叠。
PremiseThe distributions of plant clades are shaped by abiotic and biotic factors as well as historical aspects such as center of origin. Dispersals between distant areas may lead to niche evolution when lineages are established in new environments. Alternatively, dispersing lineages may exhibit niche conservatism, moving between areas with similar environmental conditions. Here we test these contrasting hypotheses in the Datureae clade (Solanaceae).MethodsWe used maximum likelihood methods to estimate the ancestral range of Datureae along with the history of biogeographic events. We then characterized the niche of each taxon using climatic and soil variables and tested for shifts in environmental niche optima. Finally, we examined how these shifts relate to the niche breadth of taxa and clades within Datureae and the degree of overlap between them.ResultsDatureae originated in the Andes and subsequently expanded its range to North America and non‐Andean regions of South America. The ancestral niche, and that of mostDaturaandTrompettiaspecies, is dry, whileBrugmansiaspecies likely shifted toward a more mesic environment. Nonetheless, most Datureae present moderate to high overlap in niche breadth today.ConclusionsThe expansion of Datureae into North America was associated with niche conservatism, with dispersal into similarly dry areas as occupied by the ancestral lineage. Subsequent niche evolution, including the apparent shift to a mesic niche inBrugmansia, diversified the range of habitats occupied by species in the tribe Datureae but also led to significant niche overlap among the three genera.