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Viburnum phylogeny based on combined molecular data: implications for taxonomy and biogeography
Author(s) -
Winkworth Richard C.,
Donoghue Michael J.
Publication year - 2005
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.3732/ajb.92.4.653
Subject(s) - biology , phylogenetics , nuclear gene , clade , evolutionary biology , chloroplast dna , viburnum , biogeography , phylogenetic tree , taxonomy (biology) , ecology , gene , botany , genome , genetics
We investigated Viburnum phylogeny using separate and combined analyses of DNA sequence data from two chloroplast and three nuclear loci. Separate analyses of nuclear and chloroplast data sets resulted in gene trees that were generally congruent with one another and with trees from two previous analyses. Our gene trees do differ in the position of section Pseudotinus , as well as in species relationships within sections Pseudotinus and Lentago . However, tests for incongruence indicate that differences between the nuclear and chloroplast data are not significant. Furthermore, gene trees from combined analyses were highly similar to those found in separate analyses, suggesting that these localized differences do not affect other parts of the tree. Our analyses provide convincing support for numerous relationships, although there is still uncertainty at the base of the tree. To facilitate future study, we propose informal names for 12 well‐supported species groups, as well as for several higher‐level clades. We also discuss the biogeographic implications of our phylogeny, focusing on repeated, although apparently temporally incongruent, patterns of disjunction between the Old and New Worlds.