Ball Laymon D, Bedoya Ana M, Taylor Charlotte M, Lagomarsino Laura P
Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana, United States.
Center for Biodiversity & Evolution, New York Botanical Garden, Bronx, New York, United States.
Evolution. 2025 Sep 12;79(8):1583-1596. doi: 10.1093/evolut/qpaf099.
Hillieae is a group of ∼30 florally diverse, Neotropical epiphyte species. Species richness peaks in southern Central America and taxa display bat, hawkmoth, or hummingbird pollination syndromes. A phylogenetic framework is needed to understand floral and biogeographic evolution. We used target enrichment data to infer a species tree and a Bayesian time-calibrated tree including ∼83% of the species in the group. We inferred ancestral biogeography and pollination syndromes, described species' realized bioclimatic niches via a principal component analysis, and estimated significant niche shifts using Ornstein-Uhlenbeck models to understand how different abiotic and biotic variables have shaped Hillieae evolution. We estimated that Hillieae originated in southern Central America 19 Ma and that hawkmoth pollination is the ancestral character state. Multiple independent shifts in pollination syndrome, biogeographic distribution, and realized bioclimatic niche have occurred, though bioclimatic niche is largely conserved. Using generalized linear models, we identify two interactions-between species' biogeographic ranges and pollination syndromes, and between phylogenetic covariance and pollination syndromes-that additively affect the degree of bioclimatic niche overlap between species. Regional variation in pollination syndrome diversity and patterns of species bioclimatic niche overlap indicate a link between biogeography and species ecology in driving Hillieae diversification and syndrome evolution.
希利族是一组约30种具有多种花型的新热带附生植物物种。物种丰富度在中美洲南部达到峰值，其分类群表现出蝙蝠、天蛾或蜂鸟传粉综合征。需要一个系统发育框架来理解花和生物地理的演化。我们利用目标富集数据推断出一个物种树和一个贝叶斯时间校准树，其中包括该组中约83%的物种。我们推断了祖先生物地理学和传粉综合征，通过主成分分析描述了物种实现的生物气候生态位，并使用奥恩斯坦-乌伦贝克模型估计了显著的生态位转移，以了解不同的非生物和生物变量如何塑造希利族的演化。我们估计希利族起源于1900万年前的中美洲南部，天蛾传粉是祖先的特征状态。传粉综合征、生物地理分布和实现的生物气候生态位发生了多次独立的转变，尽管生物气候生态位在很大程度上是保守的。使用广义线性模型，我们确定了两种相互作用——物种生物地理范围与传粉综合征之间的相互作用，以及系统发育协方差与传粉综合征之间的相互作用——它们相加影响物种之间生物气候生态位重叠的程度。传粉综合征多样性的区域差异和物种生物气候生态位重叠模式表明，生物地理学与物种生态学之间存在联系，推动了希利族的多样化和综合征演化。
