English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/179737
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

Evolutionary origin of the latitudinal diversity gradient in liverworts

AuthorsLaenen, Benjamin; Patiño, Jairo; Hagborg, Anders; Désamoré, Aurélie; Wang, Jian; Jonathan Shaw, A.; Goffinet, Bernard; Vanderpoorten, Alain
KeywordsDiversification
Latitudinal diversity gradient
Macroclimatic niche conservatism
Tropics
Bryophytes
Issue Date8-Jun-2018
PublisherElsevier
CitationMolecular Phylogenetics and Evolution 127: 606-612 (2018)
AbstractA latitudinal diversity gradient towards the tropics appears as one most recurrent patterns in ecology, but the mechanisms underlying this pattern remain an area of controversy. In angiosperms, the tropical conservatism hypothesis proposes that most groups originated in the tropics and are adapted to a tropical climatic regime, and that relatively few species have evolved physiological adaptations to cold, dry or unpredictable climates. This mechanism is, however, unlikely to apply across land plants, and in particular, to liverworts, a group of about 7500 species, whose ability to withstand cold much better than their tracheophyte counterparts is at odds with the tropical conservatism hypothesis. Molecular dating, diversification rate analyses and ancestral area reconstructions were employed to explore the evolutionary mechanisms that account for the latitudinal diversity gradient in liverworts. As opposed to angiosperms, tropical liverwort genera are not older than their extra-tropical counterparts (median stem age of tropical and extra-tropical liverwort genera of 24.35 ± 39.65 Ma and 39.57 ± 49.07 Ma, respectively), weakening the ‘time for speciation hypothesis’. Models of ancestral area reconstructions with equal migration rates between tropical and extra-tropical regions outperformed models with asymmetrical migration rates in either direction. The symmetry and intensity of migrations between tropical and extra-tropical regions suggested by the lack of resolution in ancestral area reconstructions towards the deepest nodes are at odds with the tropical niche conservatism hypothesis. In turn, tropical genera exhibited significantly higher net diversification rates than extra-tropical ones, suggesting that the observed latitudinal diversity gradient results from either higher extinction rates in extra-tropical lineages or higher speciation rates in the tropics. We discuss a series of experiments to help deciphering the underlying evolutionary mechanisms.
Publisher version (URL)https://doi.org/10.1016/j.ympev.2018.06.007
URIhttp://hdl.handle.net/10261/179737
Identifiersdoi: 10.1016/j.ympev.2018.06.007
e-issn: 1095-9513
issn: 1055-7903
Appears in Collections:(IPNA) Artículos
Files in This Item:
File Description SizeFormat 
accesoRestringido.pdf15,38 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.