Effects of climate and environmental heterogeneity on the phylogenetic structure of regional angiosperm floras worldwide

Qian, Hong; Qian, Shenhua; Zhang, Jian; Kessler, Michael

doi:10.1038/s41467-024-45155-9

Cited by 3 publications

(1 citation statement)

References 72 publications

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“…Since heterogeneous environments offer a variety of ecological niches and refuges from adverse conditions, species richness and persistence should increase with greater spatial heterogeneity [1,[3][4][5]. Environmental heterogeneity also promotes genetic and phenotypic diversity within species through diversifying selection [6][7][8][9], which may underpin local adaptations [10][11][12][13]. However, most studies that investigated relationships between environmental heterogeneity and diversity have focused on free-living species (e.g., [2,14]).…”

Section: Introductionmentioning

confidence: 99%

Within-host environmental heterogeneity is associated with phenotypic but not genomic diversity inWolbachiaendosymbionts

Pigeault,

Dussert,

Jorge

et al. 2024

Preprint

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The mechanisms underlying within-host diversification in parasite populations are still poorly understood. Yet, diversification in parasite phenotype and genotype may have important clinical and epidemiological consequences. Our aim was to determine if the constraints associated with the infection of different host tissues lead to the emergence and co-existence of multiple parasite sub-populations with different phenotypes. We tested this hypothesis by injecting the most widespread bacterial endosymbiont,Wolbachia, isolated from three tissues of the common pill-bugArmadillidium vulgareinto uninfected individuals, and by monitoring the growth rate and virulence of each bacterial sub-population in the new hosts. Our results highlighted that within-host environmental heterogeneity led to diverse phenotypes inWolbachia. This variability did not appear to result from genomic variation, but from phenotypic plasticity. Indeed, we did not find recurrent tissue-specific genomic variation among infected individuals. Whole genome resequencing of theWolbachiasub-populations and pedigree data from the animals used in this study demonstrated however the coexistence of twoWolbachiavariants within our host lineage for almost 20 years. Our results further supported the stability of theWolbachiagenome with respect to small-scale genomic variation, in agreement with reports on other symbiotic systems.

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Section: Introductionmentioning

confidence: 99%

Within-host environmental heterogeneity is associated with phenotypic but not genomic diversity inWolbachiaendosymbionts

Pigeault,

Dussert,

Jorge

et al. 2024

Preprint

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Precipitation and Soil Nitrogen as Key Drivers of Species and Phylogenetic Diversity Across Growth Forms in Picea purpurea Forests of the Eastern Qinghai–Tibet Plateau

Qi,

Cao,

et al. 2024

Land Degrad Dev

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Picea purpurea forests are a fundamental part of the coniferous forests of the Qinghai–Tibet Plateau. These forests support an extremely rich diversity of organisms while providing crucial ecological functions. Despite their importance, the species and phylogenetic diversity (PD) of these forests remain understudied. The extent to which different plant growth forms in the forest are influenced by the environment varies according to differences in the evolutionary history and characteristics of these taxa. Here, we investigate the variations in all, woody, and herbaceous plant species diversity (SD) and PD in the eastern Qinghai–Tibet Plateau's Picea purpurea forests, along with the associated environmental factors influencing these patterns. Our results show that both SD and PD exhibit similar patterns across all, woody, and herbaceous plants. Notably, mean annual precipitation, total nitrogen, and altitude were identified as the primary factors accounting for the majority of variance in SD and PD within plant communities. Specifically, we found positive correlations between SD and PD with soil total nitrogen content, while negative correlations were observed with mean annual precipitation and altitude. Furthermore, we find that the influence of environmental variables on all plants was found to be more pronounced compared to woody and especially herbaceous plants in terms of both SD and PD. Environmental factors had a direct effect on SD and PD in all woody and herbaceous plants. However, the strength of these effects varied. Importantly, our results indicate that environmental factors influence SD independently of PD. Our findings suggest that precipitation and total soil nitrogen were the most influential environmental factors affecting plant diversity across different growth forms in Picea purpurea communities. However, inferring SD from PD remains a challenging task. These findings of our study will provide guidance for forest biodiversity conservation and sustainable forest management in the Qinghai–Tibet Plateau.

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Spatial patterns and climatic drivers of phylogenetic structure of regional liverwort assemblages in China

Qian,

Vanderpoorten,

Dai

et al. 2024

Annals of Botany

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Background and Aims Latitudinal diversity gradients have been intimately linked to the tropical niche conservatism hypothesis, which posits that there has been a strong filter due to the challenges faced by ancestral tropical lineages to adapt to low temperatures and colonize extra-tropical regions. In liverworts, species richness is higher towards the tropics, but the centers of diversity of the basal lineages are distributed across extra-tropical regions, pointing to the colonization of tropical regions by phylogenetically clustered assemblages of species of temperate origin. Here, we test this hypothesis through analyses on the relationship between macroclimatic variation and phylogenetic diversity in Chinese liverworts. Methods Phylogenetic diversity metrics and their standardized effect sizes for liverworts in each of the 28 regional floras at the province level in China were related to latitude and six climate variables using regression analysis. We conducted variation partitioning analyses to determine the relative importance of each group of climatic variables. Key Results We find that the number of species decreases with latitude, whereas phylogenetic diversity shows the reverse pattern, and that phylogenetic diversity is more strongly correlated with temperature-related variables, compared with precipitation-related variables. Conclusions We interpret the opposite patterns observed in phylogenetic diversity and species richness in terms of a more recent origin of tropical diversity coupled with higher extinctions in temperate regions.

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Effects of climate and environmental heterogeneity on the phylogenetic structure of regional angiosperm floras worldwide

Cited by 3 publications

References 72 publications

Within-host environmental heterogeneity is associated with phenotypic but not genomic diversity inWolbachiaendosymbionts

Within-host environmental heterogeneity is associated with phenotypic but not genomic diversity inWolbachiaendosymbionts

Precipitation and Soil Nitrogen as Key Drivers of Species and Phylogenetic Diversity Across Growth Forms in Picea purpurea Forests of the Eastern Qinghai–Tibet Plateau

Spatial patterns and climatic drivers of phylogenetic structure of regional liverwort assemblages in China

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