The demographic and ecological factors shaping diversification among rare<i>Astragalus</i>species

Jones, Matthew R.; Winkler, Daniel E.; Massatti, Rob

doi:10.1111/ddi.13288

Cited by 11 publications

(4 citation statements)

References 108 publications

(161 reference statements)

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“…In general, the problem of inferring spatial patterns of gene flow in non-equilibrium populations may be alleviated in rare or geographically restricted species, as small populations reach migration-drift equilibrium more quickly than large populations (Whitlock and McCauley 1999). However, as shown in this and other studies (e.g., Barrett and Kohn 1991;Ellstrand and Elam 1993;Jones et al 2021a), it is not uncommon for endemic species to be locally abundant or for rare species to have unexpectedly high genetic diversity. We therefore recommend that demographic modeling be performed in conjunction with correlative landscape genetic analyses to determine whether populations likely meet the assumption of migration-drift equilibrium.…”

Section: On the Use Of Demographic Models In Conservationmentioning

confidence: 71%

Demographic modeling informs functional connectivity and management interventions in Graham’s beardtongue

2021

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Functional connectivity (i.e., the movement of individuals across a landscape) is essential for the maintenance of genetic variation and persistence of rare species. However, illuminating the processes influencing functional connectivity and ultimately translating this knowledge into management practice remains a fundamental challenge. Here, we combine various population structure analyses with pairwise, population-specific demographic modeling to investigate historical functional connectivity in Graham’s beardtongue (Penstemon grahamii), a rare plant narrowly distributed across a dryland region of the western US. While principal component and population structure analyses indicated an isolation-by-distance pattern of differentiation across the species’ range, spatial inferences of effective migration exposed an abrupt shift in population ancestry near the range center. To understand these seemingly conflicting patterns, we tested various models of historical gene flow and found evidence for recent admixture (~ 3400 generations ago) between populations near the range center. This historical perspective reconciles population structure patterns and suggests management efforts should focus on maintaining connectivity between these previously isolated lineages to promote the ongoing transfer of genetic variation. Beyond providing species-specific knowledge to inform management options, our study highlights how understanding demographic history may be critical to guide conservation efforts when interpreting population genetic patterns and inferring functional connectivity.

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Section: On the Use Of Demographic Models In Conservationmentioning

confidence: 71%

Demographic modeling informs functional connectivity and management interventions in Graham’s beardtongue

2021

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“…At the level of species rather than clades, important variables identified in the Astragalus of Eurasia have focused on seasonal rather than diurnal variation (Yang et al, 2020) or soil and topographical variables (Safaei et al, 2018; Aghajanlou et al, 2021; Baumberger et al, 2021), so phylogenetic scale is an important consideration (Graham et al, 2018). However, studies in Neo‐Astragalus have previously identified temperature variation as important for the clade; for instance, Jones et al (2021) identified BIO4 as the most important PCA loading in the A. sabulosus group of the Colorado Plateau; similarly, BIO4 was the second‐most important variable in a distribution modeling study of A. utahensis , and BIO3 was also included in the favored model (Baer and Maron, 2020).…”

Section: Discussionmentioning

confidence: 99%

Anatomy of a mega‐radiation: Biogeography and niche evolution in Astragalus

Folk,

Charboneau,

Belitz

et al. 2024

American J of Botany

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PremiseAstragalus (Fabaceae), with more than 3000 species, represents a globally successful radiation of morphologically highly similar species predominant across the northern hemisphere. It has attracted attention from systematists and biogeographers, who have asked what factors might be behind the extraordinary diversity of this important arid‐adapted clade and what sets it apart from close relatives with far less species richness.MethodsHere, for the first time using extensive phylogenetic sampling, we asked whether (1) Astragalus is uniquely characterized by bursts of radiation or whether diversification instead is uniform and no different from closely related taxa. Then we tested whether the species diversity of Astragalus is attributable specifically to its predilection for (2) cold and arid habitats, (3) particular soils, or to (4) chromosome evolution. Finally, we tested (5) whether Astragalus originated in central Asia as proposed and (6) whether niche evolutionary shifts were subsequently associated with the colonization of other continents.ResultsOur results point to the importance of heterogeneity in the diversification of Astragalus, with upshifts associated with the earliest divergences but not strongly tied to any abiotic factor or biogeographic regionalization tested here. The only potential correlate with diversification we identified was chromosome number. Biogeographic shifts have a strong association with the abiotic environment and highlight the importance of central Asia as a biogeographic gateway.ConclusionsOur investigation shows the importance of phylogenetic and evolutionary studies of logistically challenging “mega‐radiations.” Our findings reject any simple key innovation behind high diversity and underline the often nuanced, multifactorial processes leading to species‐rich clades.

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“…Populations often experience different environmental conditions, leading to the evolution of different phenotypes to maximize fitness (Freudiger et al, 2021 ; Jones et al, 2021 ). Most studies have shown that body size is affected by environmental filtering and food availability, which exhibit trade‐off relationships (Dmitriew, 2011 ; Konuma et al, 2011 ; Runemark et al, 2015 ).…”

Section: Discussionmentioning

confidence: 99%

Local ecological divergence of two closely related stag beetles based on genetic, morphological, and environmental analyses

Zhang

Kubota

2022

Ecology and Evolution

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The process of phenotypic adaptation to the environments is widely recognized.However, comprehensive studies integrating phylogenetic, phenotypic, and ecological approaches to assess this process are scarce. Our study aims to assess whether local adaptation may explain intraspecific differentiation by quantifying multidimensional differences among populations in closely related lucanid species, Platycerus delicatulus and Platycerus kawadai, which are endemic saproxylic beetles in Japan.First, we determined intraspecific analysis units based on nuclear and mitochondrial gene analyses of Platycerus delicatulus and Platycerus kawadai under sympatric and allopatric conditions. Then, we compared differences in morphology and environmental niche between populations (analysis units) within species. We examined the relationship between morphology and environmental niche via geographic distance.P. kawadai was subdivided into the "No introgression" and "Introgression" populations based on mitochondrial COI gene -nuclear ITS region discordance. P. delicatulus was subdivided into "Allopatric" and "Sympatric" populations. Body length differed significantly among the populations of each species. For P. delicatulus, character displacement was suggested. For P. kawadai, the morphological difference was likely caused by geographic distance or genetic divergence rather than environmental differences. The finding showed that the observed mitochondrial-nuclear discordance is likely due to historical mitochondrial introgression following a range of expansion.Our results show that morphological variation among populations of P. delicatulus and P. kawadai reflects an ecological adaptation process based on interspecific interactions, geographic distance, or genetic divergence. Our results will deepen understanding of ecological specialization processes across the distribution and adaptation of species in natural systems.

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The demographic and ecological factors shaping diversification among rareAstragalusspecies

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 11 publications

References 108 publications

Demographic modeling informs functional connectivity and management interventions in Graham’s beardtongue

Demographic modeling informs functional connectivity and management interventions in Graham’s beardtongue

Anatomy of a mega‐radiation: Biogeography and niche evolution in Astragalus

Local ecological divergence of two closely related stag beetles based on genetic, morphological, and environmental analyses

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