A targeted phylogenetic approach helps explain New World functional diversity patterns of two eudicot lineages
A targeted phylogenetic approach helps explain New World functional diversity patterns of two eudicot lineages
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DOI：
10.1111/jbi.13993
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发表时间：
2020-10-18
影响因子：
3.9
通讯作者：
Smith, Stephen A.
中科院分区：
文献类型：
--
作者：
Figueroa, Hector;Smith, Stephen A.
目的大规模的功能多样性研究通常考察孤立的性状，通常没有系统发育背景。在这里，我们将来自五个生活史性状的数据与系统发育和发生记录相结合，以评估：(A)性状组合的相关纬度梯度；(B)哪些性状表现出系统发育保守性；(C)性状综合征的数量、特定支系的差异，说明可观察到的生态策略变化的系统发育规模。地理位置：美洲。分类群Ericales(Asterides)和Fabales(Rosids)。方法利用公开可用的高度、种子质量、木材密度、单位面积叶质量(LMA)和生长型(LMA)等性状数据集，以及地理参考的发生记录，研究功能多样性格局。我们分别采用系统发育广义最小二乘法和系统发育主成分分析(PPCA)来评估相关性状进化和量化性状综合征。我们使用了InfoMap生态区域网络应用程序来按生物区域对物种进行分类。我们使用标准统计检验和随机模拟来评估结果的统计学意义。结果Ericales和Fabales表现出生物地理上一致的、系统发育保守的特征综合征。向极地移动，物种表现出越来越小的特征值和更多的草本和灌木生长形式(除了LMA，没有表现出一致的模式)。我们使用PPCA量化了这一性状综合征的纬度变异，并为相关性状的进化提供了证据。主要结论我们发现了一个涉及高度、种子质量、木材密度和生长形态的功能性状综合征，而不是LMA。功能性状值显示出一致的纬度模式和相关进化的证据，表明了潜在的生态策略。此外，这两个支系在这一特征综合征的表现上表现出数量上的差异。该综合征的变异最好是观察到来自连续科的物种之间的差异。我们将这一性状综合症解释为一种资源获取策略，即土壤养分含量相对较高、生长季节较短的生境有利于较短的身高、较低的种子质量和木材密度，以及灌木或草本生长形式。
Aim Large-scale functional diversity studies typically examine isolated traits, often without phylogenetic context. Here, we integrate data from five life-history traits with phylogeny and occurrence records to assess: (a) correlated latitudinal gradients of trait combinations; (b) which traits show phylogenetic conservatism and (c) quantitative, clade-specific differences in trait syndromes, illustrating the phylogenetic scale of observable variation in ecological strategies. Location The Americas. Taxon Ericales (Asterids) and Fabales (Rosids). Methods We used publicly available trait data sets on height, seed mass, wood density, leaf mass per area (LMA) and growth form, an open-source phylogeny, and georeferenced occurrence records to investigate functional diversity patterns. We employed phylogenetic generalized least squares and phylogenetic principal components analyses (pPCA) to assess correlated trait evolution and quantify the trait syndrome, respectively. We employed the InfoMap Ecoregions web app to cluster species by bioregions. We used standard statistical tests and randomization simulations to assess statistical significance of results. Results Ericales and Fabales exhibited a biogeographically consistent, phylogenetically conserved trait syndrome. Moving poleward, species exhibited progressively smaller trait values and more herbaceous and shrubby growth forms (except for LMA, which showed no consistent pattern). We quantified latitudinal variation in this trait syndrome using pPCA, and provide evidence for correlated trait evolution. Main conclusions We demonstrate a functional trait syndrome involving height, seed mass, wood density and growth form, but not LMA. Functional trait values showed consistent latitudinal patterns and evidence of correlated evolution, suggesting an underlying ecological strategy. Furthermore, the two clades showed quantitative differences in the manifestation of this trait syndrome. Variation in the syndrome was best observed among species from con-ordinal families. We interpret this trait syndrome as a strategy of resource acquisition in which habitats with relatively greater soil nutrient content and a shorter growing season favour shorter stature, lower seed mass and wood density, and shrubby or herbaceous growth form.