Species richness is not only spatially heterogeneous in latitudes, but also among hyperdiverse tropical plants. However, few studies have elucidated patterns of species abundance in tropical terrestrial orchids.
In a study published in Molecular Phylogenetics and EvolutionResearchers from the Xishuangbanna Tropical Botanical Garden (XTBG) of the Chinese Academy of Sciences and their collaborators sought to reveal the temporal and spatial dynamics of tropical terrestrial orchids and to explain the main causes of variation in the abundance of species among tropical plants through their evolutionary history.
The researchers reconstructed the phylogenetic relationships and evolutionary history of the Collabieae, and combined climate and distribution data to discuss potential causes of global differences in richness among tropicals. that flower.
The researchers collected 127 species in 21 genera (representing 88% genera and 26% species) in the tribe Collabieae of the orchid family, and used 24 plastid markers and two nuclear regions to reconstruct the most widely sampled phylogenetic tree of Collabieae to date.
Based on empirical and simulated complete sampling, the researchers further investigated the biogeography, diversification processes and niche evolutionary rates of Collabieae.
They found that the Collabieae originated in Asia and spread independently to other tropics. The net diversification and niche evolutionary rates of Asian lineages are higher than those of African and Oceanian lineages. Rainfall is the most important environmental factor, coupled with the fact that the Asian lineage experienced a more stable and humid climate, which may contribute to the high diversification rate of Collabieae in Asia.
“So we consider that different net diversification rates are the main driver of species richness disparity, integrated with different colonization times,” said Luo Yan of XTBG.
Peng Zhou et al, Species richness disparity in tropical terrestrial herbaceous floras: Evolutionary insight from Collabieae (Orchidaceae), Molecular Phylogenetics and Evolution (2023). DOI: 10.1016/j.ympev.2023.107860
Awarded by the Chinese Academy of Sciences
Citation: Net diversification rate primarily drives variation in species richness of tropical terrestrial orchids (2023, July 19) retrieved 19 July 2023 from https://phys.org/news/2023-07-net -diversification-species-richness-disparity.html
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