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Diversification rate vs. diversification density: Decoupled consequences of plant height for diversification of Alooideae in time and space

While biodiversity hotspots are typically identified on the basis of species number per unit area, their exceptional richness is often attributed, either implicitly or explicitly, to high diversification rates. High species concentrations, however, need not reflect rapid diversification, with the di...

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Autores principales: Boucher, Florian C., Quatela, Anne-Sophie, Ellis, Allan G., Verboom, G. Anthony
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7250425/
https://www.ncbi.nlm.nih.gov/pubmed/32453786
http://dx.doi.org/10.1371/journal.pone.0233597
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author Boucher, Florian C.
Quatela, Anne-Sophie
Ellis, Allan G.
Verboom, G. Anthony
author_facet Boucher, Florian C.
Quatela, Anne-Sophie
Ellis, Allan G.
Verboom, G. Anthony
author_sort Boucher, Florian C.
collection PubMed
description While biodiversity hotspots are typically identified on the basis of species number per unit area, their exceptional richness is often attributed, either implicitly or explicitly, to high diversification rates. High species concentrations, however, need not reflect rapid diversification, with the diversity of some hotspots accumulating at modest rates over long timespans. Here we explore the relationship between diversification in time vs. diversification in space and develop the concept of diversification density to describe the spatial scale of species accumulation in a clade. We investigate how plant height is associated with both aspects of diversification in Alooideae, a large plant subfamily with its center of diversity in the Greater Cape Floristic Region. We first reconstruct a time-calibrated phylogeny for Alooideae and demonstrate an evolutionary tendency towards reduced plant height. While plant height does not correlate with diversification rate across Alooideae it does so with diversification per unit space: clades of small plants tend to have the highest diversification densities. Furthermore, we find that diversification in time vs. space are uncorrelated. Our results show that diversification rate and density can be decoupled, and suggest that while some biodiversity hotspots might have been generated by high diversification rates, others are the product of high diversification density.
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spelling pubmed-72504252020-06-08 Diversification rate vs. diversification density: Decoupled consequences of plant height for diversification of Alooideae in time and space Boucher, Florian C. Quatela, Anne-Sophie Ellis, Allan G. Verboom, G. Anthony PLoS One Research Article While biodiversity hotspots are typically identified on the basis of species number per unit area, their exceptional richness is often attributed, either implicitly or explicitly, to high diversification rates. High species concentrations, however, need not reflect rapid diversification, with the diversity of some hotspots accumulating at modest rates over long timespans. Here we explore the relationship between diversification in time vs. diversification in space and develop the concept of diversification density to describe the spatial scale of species accumulation in a clade. We investigate how plant height is associated with both aspects of diversification in Alooideae, a large plant subfamily with its center of diversity in the Greater Cape Floristic Region. We first reconstruct a time-calibrated phylogeny for Alooideae and demonstrate an evolutionary tendency towards reduced plant height. While plant height does not correlate with diversification rate across Alooideae it does so with diversification per unit space: clades of small plants tend to have the highest diversification densities. Furthermore, we find that diversification in time vs. space are uncorrelated. Our results show that diversification rate and density can be decoupled, and suggest that while some biodiversity hotspots might have been generated by high diversification rates, others are the product of high diversification density. Public Library of Science 2020-05-26 /pmc/articles/PMC7250425/ /pubmed/32453786 http://dx.doi.org/10.1371/journal.pone.0233597 Text en © 2020 Boucher et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Boucher, Florian C.
Quatela, Anne-Sophie
Ellis, Allan G.
Verboom, G. Anthony
Diversification rate vs. diversification density: Decoupled consequences of plant height for diversification of Alooideae in time and space
title Diversification rate vs. diversification density: Decoupled consequences of plant height for diversification of Alooideae in time and space
title_full Diversification rate vs. diversification density: Decoupled consequences of plant height for diversification of Alooideae in time and space
title_fullStr Diversification rate vs. diversification density: Decoupled consequences of plant height for diversification of Alooideae in time and space
title_full_unstemmed Diversification rate vs. diversification density: Decoupled consequences of plant height for diversification of Alooideae in time and space
title_short Diversification rate vs. diversification density: Decoupled consequences of plant height for diversification of Alooideae in time and space
title_sort diversification rate vs. diversification density: decoupled consequences of plant height for diversification of alooideae in time and space
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7250425/
https://www.ncbi.nlm.nih.gov/pubmed/32453786
http://dx.doi.org/10.1371/journal.pone.0233597
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