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Successive arrivals since the Miocene shaped the diversity of the Caribbean Acalyphoideae (Euphorbiaceae)
Author(s) -
Cervantes Angélica,
Fuentes Susy,
Gutiérrez Jorge,
Magallón Susana,
Borsch Thomas
Publication year - 2016
Publication title -
journal of biogeography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 158
eISSN - 1365-2699
pISSN - 0305-0270
DOI - 10.1111/jbi.12790
Subject(s) - mesoamerica , geography , clade , caribbean region , caribbean island , old world , endemism , late miocene , taxon , archipelago , pleistocene , phylogeography , biogeography , phylogenetic tree , ecology , biology , latin americans , paleontology , archaeology , biochemistry , linguistics , philosophy , structural basin , gene
Aim Using the Acalyphoideae, we explore the origin and diversification of the Caribbean flora. This lineage of flowering plants constitutes an important component of the flora of the Caribbean islands with many endemics. Furthermore, because it is also diverse in adjacent Mexico, Mesoamerica and South America, it allows a representative analysis of possible migration routes into the Caribbean. Location Neotropics, Cuba, Hispaniola and the Caribbean region, Mexico and Mesoamerica. Methods We generated a well‐resolved and dated phylogenetic hypothesis based on a dense sampling, in particular of the New World taxa but also representing all remaining Acalyphoideae, and combined datasets of chloroplast spacers and introns. Bayesian divergence‐time estimation was applied to determine node ages. Ancestral states of distributional areas were reconstructed in a Bayesian framework to determine the geographical origin of the Caribbean ancestors. Results A Neotropical clade started to diversify 59.29 [50.41–68.44 95% highest posterior density ( HPD )] Ma within the Acalyphoideae. The Caribbean islands then were reached several times independently from the Miocene onwards. The exclusively Caribbean Leucocroton – Lasiocroton – Garciadelia [9.1 (6.3–12.3 95% HPD ) Ma] and Acidoton – Platygyna [9.3 (5.2–15.4 95% HPD ) Ma] clades exhibit one of the most successful plant radiations in the region, and Caribbean subclades of Acalypha and Bernardia just date back to the Pliocene and Pleistocene, respectively. Main conclusions Our data show that Mexico and Mesoamerica have played a key role as a source for today's Caribbean Acalyphoideae. Their ancestors arrived from the mainland to the Caribbean islands during the Miocene when Caribbean land masses were completely separated and then diversified in situ . We postulate long‐distance dispersal to have played a major role for colonizing the Caribbean.