FROM FOREST TO SAVANNA AND BACK TO FOREST: EVOLUTIONARY HISTORY OF THE GENUSDimorphandra(LEGUMINOSAE)

Abstract

AbstractThe tree genusDimorphandracomprises 26 species, which are circumscribed into three subgenera. The subgenusDimorphandrais associated with both rainforests (Amazon and Atlantic Forest) and savanna-like vegetation (Cerrado); whereas the subgeneraPocillumandPhaneropsiaare restricted to the Amazon. We obtained DNA sequence data from six gene regions of the chloroplast genome (cpDNA) and the nuclear internal transcribed spacer (ITS) from 17 species ofDimorphandraand 12 closely related species. Bayesian phylogeny and haplotype network analyses together with both ancestral area reconstructions and ecological niche modeling allowed for exploring the late evolutionary history of the genusDimorphandra. Species within the subgenusPhaneropsiawere more closely related to species of the genusMorathan to the remaining congeners in the plastid tree (but not in the ITS tree), casting doubts on the monophyly ofDimorphandra. Such incongruence may be the result of incomplete lineage sorting of ancient polymorphisms. Amazonian lineages (subgeneraPocillumandPhaneropsia) were highly polymorphic and divergent; whereas lineages from either the Cerrado or the Atlantic Forest were genetically depauperate. The Amazon seems to be the likely source of the lineage that gave rise to the extant species ofDimorphandraof the Cerrado. In turn, a lineage that occupied the Cerrado likely gave rise to the extant species that occur in the Atlantic Forest. Habitat shifts may have been a key driving force that shaped the late evolutionary history ofDimorphandra.