2024-03-28T13:26:00Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1797372022-06-30T07:29:57Zcom_10261_48com_10261_5col_10261_301
DIGITAL.CSIC
author
Laenen, Benjamin
author
Patiño, Jairo
author
Hagborg, Anders
author
Désamoré, Aurélie
author
Wang, Jian
author
Jonathan Shaw, A.
author
Goffinet, Bernard
author
Vanderpoorten, Alain
funder
European Commission
funder
Ministerio de Economía, Industria y Competitividad (España)
2019-04-09T15:24:29Z
2019-04-09T15:24:29Z
2018-06-08
Molecular Phylogenetics and Evolution 127: 606-612 (2018)
http://hdl.handle.net/10261/179737
10.1016/j.ympev.2018.06.007
http://dx.doi.org/10.13039/501100000780http://dx.doi.org/10.13039/501100010198
A 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.
eng
closedAccess
Diversification
Latitudinal diversity gradient
Macroclimatic niche conservatism
Tropics
Bryophytes
Evolutionary origin of the latitudinal diversity gradient in liverworts
artículo
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URL
https://digital.csic.es/bitstream/10261/179737/1/accesoRestringido.pdf
File
MD5
42637ae8545636bc41605c1740a9a84e
15753
application/pdf
accesoRestringido.pdf