Interpreting the modern distribution of Myrtaceae using a dated molecular phylogeny

Thornhill, Andrew H.; Ho, Simon Y. W.; Külheim, Carsten; Crisp, Michael D.

doi:10.1016/j.ympev.2015.07.007

Cited by 173 publications

(157 citation statements)

References 87 publications

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“…The genus Eucalyptus (L'Héritier 1789; the “eucalypts”) is described as a highly speciose lineage of trees and large shrubs within family Myrtaceae . Of the more than 800 described species (Nicolle, ; Pryor & Johnson, ) that have evolved over the last 70 My (Thornhill, Ho, Külheim, & Crisp, ), nearly all are endemic to the Australian continent, with a small number of species occurring in Indonesia, the Philippines and New Guinea. Here we focus on two woodland eucalypt species.…”

Section: Methodsmentioning

confidence: 99%

Landscape drivers of genomic diversity and divergence in woodland Eucalyptus

et al. 2019

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Spatial genetic patterns are influenced by numerous factors, and they can vary even among coexisting, closely related species due to differences in dispersal and selection. Eucalyptus (L'Héritier 1789; the “eucalypts”) are foundation tree species that provide essential habitat and modulate ecosystem services throughout Australia. Here we present a study of landscape genomic variation in two woodland eucalypt species, using whole‐genome sequencing of 388 individuals of Eucalyptus albens and Eucalyptus sideroxylon. We found exceptionally high genetic diversity (π ≈ 0.05) and low genome‐wide, interspecific differentiation (FST = 0.15) and intraspecific differentiation between localities (FST ≈ 0.01–0.02). We found no support for strong, discrete population structure, but found substantial support for isolation by geographic distance (IBD) in both species. Using generalized dissimilarity modelling, we identified additional isolation by environment (IBE). Eucalyptus albens showed moderate IBD, and environmental variables have a small but significant amount of additional predictive power (i.e. IBE). Eucalyptus sideroxylon showed much stronger IBD and moderate IBE. These results highlight the vast adaptive potential of these species and set the stage for testing evolutionary hypotheses of interspecific adaptive differentiation across environments.

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Section: Methodsmentioning

confidence: 99%

Landscape drivers of genomic diversity and divergence in woodland Eucalyptus

et al. 2019

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“…), Cunoniaceae (Bradford & Barnes ), Euphorbiaceae (Tokuoka ), Myrtaceae (Thornhill et al. ), Rubiaceae (Wikström et al. ), Rutaceae (Bayly et al.…”

Section: Methodsmentioning

confidence: 99%

Community variation in wood density along a bioclimatic gradient on a hyper‐diverse tropical island

Ibanez

Chave

Barrabé

et al. 2016

J Vegetation Science

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Aims: Analyse the controversial relationship existing between wood density, precipitation, temperature and aridity, and its importance in shaping forest communities facing drought. Location: New Caledonia (SW Pacific). Methods: We sampled wood density in 1580 trees belonging to 175 species across nine sites (eight 1-ha plots) located in dry, mesic and humid forests. We tested whether wood density varied across species, communities and habitats, and depended on mean annual precipitation (MAP), mean annual temperature (MAT) and an aridity index (AI). We also tested whether the variations observed in community mean wood density (WDmean) and in wood density standard deviation differed from those obtained by a randomized species distribution across communities. We constructed a phylogenetic supertree at genus level and tested for the non-random distribution of WDmean. Results: We found that WDmean tended to increase with increasing aridity (i.e. decreasing MAP and increasing MAT) and was significantly higher than expected under randomized species distribution at the dry forest site only. However, some species with low wood density grew well at these dry sites. At genus level, wood density was not random within the phylogenetic supertree. Some lineages exhibiting higher wood density than expected by randomization were also the most represented at the dry sites. Conclusions: Although we did not observe an environmental filter sensu stricto, aridity associated with a low MAP and a high MAT at the dry and mesic forest sites was likely to favour species with a high wood density. Our phylogenetic results suggested that species belonging to a few lineages exhibiting high wood density were likely to be adapted to drought, hence favoured by increasing drought. (Résumé d'auteur

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“…1) and thus potentially capable of explaining the significant feedbacks observed in these species. This was because divergence time of the subgenera is not well known, but estimated to be between 35 and 46 million years (Crisp et al 2004, Thornhill et al 2015. Both relationships were positive, indicating that species that contained family Fistulinaceae Fig.…”

Section: Resultsmentioning

confidence: 99%

Phylogenetic trait conservatism predicts patterns of plant‐soil feedback

et al. 2018

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Plant-soil feedbacks (PSFs) are important drivers of plant community structure and diversity, with species varying in the way they both condition soils and respond to them. While plant phylogenetic relationships alone can predict this variation in some instances, trait conservatism across phylogenies may provide more reliable predictions. Using integrated common garden and glasshouse inoculation experiments including 13 Eucalyptus species across two subgenera, we specifically investigated soil microbial conditioning and root chemical traits as underlying drivers of phylogenetic differences in PSF. We found that eucalypt species responded variably to soils conditioned by closely related species, depending on their phylogenetic lineage, which was further related to root terpene concentrations and the presence/absence of specific fungal taxa in conditioned soils. Overall, these findings show that trait conservatism in root chemical traits and the subsequent conditioning of soil microbial communities can explain whether or not plants show phylogenetic patterns in PSF.

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Interpreting the modern distribution of Myrtaceae using a dated molecular phylogeny

Cited by 173 publications

References 87 publications

Landscape drivers of genomic diversity and divergence in woodland Eucalyptus

Landscape drivers of genomic diversity and divergence in woodland Eucalyptus

Community variation in wood density along a bioclimatic gradient on a hyper‐diverse tropical island

Phylogenetic trait conservatism predicts patterns of plant‐soil feedback

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