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Beyond aridification: multiple explanations for the elevated diversification of cacti in the New World Succulent Biome
Author(s) -
HernándezHernández Tania,
Brown Joseph W.,
Schlumpberger Boris O.,
Eguiarte Luis E.,
Magallón Susana
Publication year - 2014
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.12752
Subject(s) - aridification , biome , arid , biology , macroevolution , diversification (marketing strategy) , pollination , ecology , phylogenetic tree , ecosystem , pollen , biochemistry , marketing , gene , business
Summary Succulent plants are widely distributed, reaching their highest diversity in arid and semi‐arid regions. Their origin and diversification is thought to be associated with a global expansion of aridity. We test this hypothesis by investigating the tempo and pattern of Cactaceae diversification. Our results contribute to the understanding of the evolution of New World Succulent Biomes. We use the most taxonomically complete dataset currently available for Cactaceae. We estimate divergence times and utilize Bayesian and maximum likelihood methods that account for nonrandom taxonomic sampling, possible extinction scenarios and phylogenetic uncertainty to analyze diversification rates, and evolution of growth form and pollination syndrome. Cactaceae originated shortly after the Eocene–Oligocene global drop in CO 2 , and radiation of its richest genera coincided with the expansion of aridity in North America during the late Miocene. A significant correlation between growth form and pollination syndrome was found, as well as a clear state dependence between diversification rate, and pollination and growth‐form evolution. This study suggests a complex picture underlying the diversification of Cactaceae. It not only responded to the availability of new niches resulting from aridification, but also to the correlated evolution of novel growth forms and reproductive strategies.