Open AccessCenozoic colonization and diversification patterns of tropical A merican palms: evidence from A strocaryum ( A recaceae)
Author(s) -
Roncal Julissa,
Kahn Francis,
Millan Betty,
Couvreur Thomas L. P.,
Pintaud JeanChristophe
Publication year - 2013
Publication title -
botanical journal of the linnean society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.872
H-Index - 68
eISSN - 1095-8339
pISSN - 0024-4074
DOI - 10.1111/j.1095-8339.2012.01297.x
Subject(s) - arecaceae , biology , cladogenesis , ecology , phylogenetic tree , biological dispersal , colonization , land bridge , clade , palm , population , biochemistry , physics , demography , quantum mechanics , sociology , gene
With 788 species in 67 genera in the N eotropics, A recaceae are an important ecological and economic component of the region. We review the influence of geological events such as the P ebas system, the A ndean uplift and the land connections between S outh and C entral/ N orth A merica, on the historical assembly of N eotropical palms. We present a case study of the palm genus A strocaryum (40 species) as a model for evaluating colonization and diversification patterns of lowland N eotropical taxa. We conducted a B ayesian dated phylogenetic analysis based on four low‐copy nuclear DNA regions and a biogeographical analysis using the dispersal, extinction and cladogenesis model. Cladogenesis of W estern A mazonian A strocaryum spp. ( c . 6 Mya ) post‐dated the drainage of the aquatic P ebas system, supporting the constraining role of P ebas on in situ diversification and colonization. The ancestral distribution of A strocaryum spp. in the G uiana S hield supported the hypothesis of an old formation that acted as a source area from which species colonized adjacent regions, but an earliest branching position for G uianan species was not confidently recovered. A twofold increase in diversification rate was found in a clade, the ancestor of which occupied the G uiana Shield ( c . 13 M ya, a time of climatic change and Andean uplift). © 2012 The Linnean Society of London, Botanical Journal of the Linnean Society , 2012, ●●, ●●–●●.