SMILE

Stochastic Models for the Inference of Life Evolution

Presence in Mediterranean hotspots and floral symmetry affect speciation and extinction rates in Proteaceae

Reyes, E., Morlon, H., Sauquet, H.

New Phytologist

2015

The Proteaceae is a large angiosperm family displaying the common pattern of uneven distribution of species among genera. Previous studies have shown that this disparity is a result of variation in diversification rates across lineages, but the reasons for this variation are still unclear. Here, we tested the impact of floral symmetry and occurrence in Mediterranean climate regions on speciation and extinction rates in the Proteaceae. A rate shift analysis was conducted on dated genus-level phylogenetic trees of the Proteaceae. Character-dependent analyses were used to test for differences in diversification rates between actinomorphic and zygomorphic lineages and between lineages located within or outside Mediterranean climate regions. The rate shift analysis identified 5-10 major diversification rate shifts in the Proteaceae tree. The character-dependent analyses showed that speciation rates, extinction rates and net diversification rates of the Proteaceae were significantly higher for lineages occurring in Mediterranean hotspots. Higher speciation and extinction rates were also detected for zygomorphic species, but net diversification rates appeared to be similar in actinomorphic and zygomorphic Proteaceae. Presence in Mediterranean hotspots favors Proteaceae diversification. In contrast with observations at the scale of angiosperms, floral symmetry is not a trait that strongly influences their evolutionary success.

Bibtex

@article{reyes_presence_2015,
Author = {Reyes, Elisabeth and Morlon, Helene and Sauquet, Herve},
Title = {Presence in {Mediterranean} hotspots and floral
symmetry affect speciation and extinction rates in
{Proteaceae}},
Journal = {New Phytologist},
Volume = {207},
Number = {2},
Pages = {401--410},
Note = {WOS:000356598800017},
Keywords = {angiosperms, cape biodiversity hotspot,
diversification rates, diversity, evolutionary process,
extinction rates, floral symmetry, Mediterranean
hotspots, molecular phylogenies, phosphorus,
Proteaceae, radiation, range evolution,
self-incompatibility, speciation rates, species
diversification},
abstract = {The Proteaceae is a large angiosperm family displaying
the common pattern of uneven distribution of species
among genera. Previous studies have shown that this
disparity is a result of variation in diversification
rates across lineages, but the reasons for this
variation are still unclear. Here, we tested the impact
of floral symmetry and occurrence in Mediterranean
climate regions on speciation and extinction rates in
the Proteaceae. A rate shift analysis was conducted on
dated genus-level phylogenetic trees of the Proteaceae.
Character-dependent analyses were used to test for
differences in diversification rates between
actinomorphic and zygomorphic lineages and between
lineages located within or outside Mediterranean
climate regions. The rate shift analysis identified
5-10 major diversification rate shifts in the
Proteaceae tree. The character-dependent analyses
showed that speciation rates, extinction rates and net
diversification rates of the Proteaceae were
significantly higher for lineages occurring in
Mediterranean hotspots. Higher speciation and
extinction rates were also detected for zygomorphic
species, but net diversification rates appeared to be
similar in actinomorphic and zygomorphic Proteaceae.
Presence in Mediterranean hotspots favors Proteaceae
diversification. In contrast with observations at the
scale of angiosperms, floral symmetry is not a trait
that strongly influences their evolutionary success.},
doi = {10.1111/nph.13244},
issn = {0028-646X},
language = {English},
month = jul,
year = 2015
}

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