Niche conservatism and strong phylogenetic signals in climate,soil,and morphological variation of Neotropical firs(Abies,Pinaceae)  

作　　者：Jorge Cruz-Nicolás Norberto Martínez-Méndez Erika Aguirre-Planter Luis E.Eguiarte Juan P.Jaramillo-Correa 

机构地区：[1]Departamento de Ecología Evolutiva,Instituto de Ecología,Universidad Nacional Autónoma de México,AP70-275,CDMX 04510,México [2]Departamento de Botánica,Instituto de Biología,Universidad Nacional Autónoma de México,AP 70-233,CDMX 04510,México [3]Laboratorio de Bioconservación y Manejo,Departamento de Zoología,Escuela Nacional de Ciencias Biológicas del Instituto Politécnico Nacional,CDMX,México

出　　处：《Journal of Systematics and Evolution》2024年第3期368-383,共16页植物分类学报（英文版）

基　　金：financed by grants from CONACYT (CB-2016-284457 and 278987);the Direccion General de Asuntos del Personal Académico from the Universidad Nacional Autonoma de Mexico (PAPIIT-IN208416)。

摘　　要：Interspecific trait divergence may reflect adaptation and reproductive isolation,particularly after the rapid differentiation that may follow the colonization of new environments.Although new lineages are generally expected to be morphologically and ecologically similar to their ancestors,environmental forces can also drive adaptive differentiation along specific phenotypic axes.We used climate niche models and comparative analyses based on a previously inferred phylogeny to examine the history of ecological and morphological divergence of Neotropical firs(Abies Mill.,Pinaceae),a group of conifers that have recently colonized and diversified in the mountains of Mexico and northern Central America.We inferred past secondary contact zones by comparing current and past climate niche projections and looked for evidence of recent interspecific gene flow using genomic data.Neotropical firs have similar niches to each other and show a strong phylogenetic signal for most evaluated morphological traits.Analyses based on individual variables suggested a random walk model of differentiation.However,early adaptation to tropical conditions is inferred in the ancestor of the southernmost firs,as all modern southern taxa are differentiated climatically from Abies concolor,the northernmost species.In addition,observed autapomorphic traits for soil properties and the number of resin ducts in needles are consistent with possible species-specific adaptations.Thus,a combination of nonadaptive and adaptive processes along different phenotypic axes,some related to the environment,likely operated after the southward migration of this plant lineage from North America and its subsequent radiation in the Neotropics.

关 键 词：comparative method firs gene flow Neotropical mountains nonadaptive evolution 

分 类 号：Q94[生物学—植物学]