Journal
MOLECULAR PHYLOGENETICS AND EVOLUTION
Volume 169, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ympev.2022.107412
Keywords
Historical biogeography; Macroalgae; Marine biogeography; Speciation; Vicariance; Pacific Ocean
Funding
- DUNE Labex-CORAIL project
- UMR ENTROPIE (IRD) funds
- Agence francaise de Developpement
- Pacific Fund
- Total Foundation
- Prince Albert II of Monaco Foundation
- Stavros Niarchos Foundation under Our Planet Reviewed
- Museum national d'histoire naturelle (MNHN)
- Pro Natura International (PNI)
- Institut d'Halieutique et des Sciences Marines, University of Toliara (IHSM)
- Madagascar bureau of Wildlife Conservation Society (WCS). The Institut de Recherche pour le Developpement (IRD)
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This study examines the biogeographical processes and biodiversity patterns of the siphonous green algal family Udoteaceae. Through the analysis of a comprehensive dataset, the study reveals the origin, diversification, and distribution patterns of the family. The study identifies three centers of species richness: the Central Indo-Pacific, the Western Indian Ocean, and the Greater Caribbean, which have been shaped by various drivers.
There is a growing interest in elucidating the biogeographical processes underlying biodiversity patterns of seaweeds, with recent studies largely focusing on red and brown macroalgae. This study focuses on the siphonous green algal family Udoteaceae, which is diverse and globally distributed in tropical to warm-temperate seas, and includes species that form important components of tropical reefs. We explored the historical processes that have shaped current biodiversity patterns in the family by analyzing a comprehensive dataset of 568 specimens sampled across its geographical range, and including 45 species, corresponding to 59% of the known diversity. Historical biogeographical analysis was based on a three-locus time-calibrated phylogeny, and probabilistic modeling of geographical range evolution. Many species were found to have restricted ranges, indicative of low dispersal capacity. Our analysis points toward a Western Tethys origin and early diversification of the Udoteaceae in the Triassic period. Three centers of diversity were identified, which are, in order of highest species richness, the Central Indo-Pacific, the Western Indian Ocean, and the Greater Caribbean. Different drivers have likely played a role in shaping these diversity centres. Species richness in the Central Indo-Pacific likely resulted from speciation within the region, as well as recolonization from neighbouring regions, and overlap of some wider ranged species, corroborating the biodiversity feedback model. Species richness in the Western Indian Ocean can be explained by ancient and more recent diversification within the region, and dispersal from the Central Indo-Pacific. The Greater Caribbean region was colonized more recently, followed by diversification within the region.
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