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Global biogeography and diversification of a group of brown seaweeds (Phaeophyceae) driven by clade-specific evolutionary processes
Vieira, Christophe et al. (2021), Global biogeography and diversification of a group of brown seaweeds (Phaeophyceae) driven by clade-specific evolutionary processes, Dryad, Dataset, https://doi.org/10.5061/dryad.9s4mw6mf7
Contact: Tyberghein, Lennert ;
Availability: To the extent possible under law, the person who associated CC0 with this dataset has waived all copyright and related or neighboring rights to this dataset.
Investigation of the evolutionary processes within the Dictyotales. more
Aim: Historical processes that shaped current diversity patterns of seaweeds remain poorly understood. Using Dictyotales, a globally distributed order of brown seaweeds as a model, we test if historical biogeographical and diversification patterns are comparable across clades. Dictyotales contain some 22 genera, three of which, Dictyota, Lobophora and Padina, are exceptionally diverse. Specifically we test if the evolutionary processes in these clades that shaped their latitudinal diversity patterns are in line with the tropical conservatism, the out-of-the-tropics, and diversification rate hypotheses.
Methods: Species diversity was inferred using DNA-based species delineation, addressing cryptic diversity and circumventing taxonomic problems. A six-gene time-calibrated phylogeny, distribution data of 3,755 specimens, and probabilistic modeling of geographic range evolution was used to infer historical biogeographical patterns. The phylogeny was tested against different trait dependent models in order to compare diversification rates for different geographical units as well as different thermal affinities.
Results: The Dictyotales originated in the Middle Jurassic and reach a current peak of species diversity in the Central Indo-Pacific. Ancestral range estimation points to a southern hemisphere origin of Dictyotales corresponding to the tropical southern Tethys Sea. Our results demonstrate that diversification rates were generally higher in tropical regions, but increased diversification rates in different clades are driven by different processes. Three major clades underwent a major diversification burst in the early Cenozoic, with Dictyota and Padina expanding their distribution into temperate regions, while Lobophora retained a predominantly tropical niche.
Main conclusions: Our results are consistent with both the tropical conservatism hypothesis, in which clades originate and remain in the tropics (Lobophora), and the out-of-the-tropics scenario, where taxa originate and expand towards the temperate regions while preserving their presence in the tropics (Dictyota, Padina).
Biology > Macroalgae
Benthic algae, Benthic environment, Benthic flora, Biogeography, Coastal environment, Coastal waters, Coastal zone, Evolutionary pattern, Evolutionary trees, Historical biogeography, Marine environment, Phaeophyceae, Phylogenetic taxonomy, Phylogeny, Scripts, Seaweeds, Global, Dictyotales, Phaeophyceae
Universiteit Gent; Faculteit Wetenschappen; Vakgroep Biologie; Onderzoeksgroep Fycologie, more, data creator
Vlaamse overheid; Beleidsdomein Economie, Wetenschap en Innovatie; Plantentuin Meise, more, data creator
Dataset status: Completed
Data type: Software/models/scripts
Data origin: Research
Metadatarecord created: 2021-12-20
Information last updated: 2022-02-02