Temperate radiations and dying embers of a tropical past: the diversification of Viburnum. Issue 2 (3rd February 2015)

• Record Type: Journal Article
• Authors: Spriggs, Elizabeth L.; Clement, Wendy L.; Sweeney, Patrick W.; Madriñán, Santiago; Edwards, Erika J.; Donoghue, Michael J.
• Is Part Of: New phytologist. Volume 207:Issue 2(2015)
• Page Start: 340
• Page End: 354
• Publication Date: 2015-02-03
• Subjects: Botany -- Periodicals; 580
• DOI: 10.1111/nph.13305
• Languages: English
• ISSNs: 0028-646X

Abstract

<abstract abstract-type="main" id="nph13305-abs-0001"> <title>Summary</title> <p> <list id="nph13305-list-0001" list-type="bullet"> <list-item> <p>We used a near‐complete phylogeny for the angiosperm clade <italic>Viburnum</italic> to assess lineage diversification rates, and to examine possible morphological and ecological factors driving radiations.</p> </list-item> <list-item> <p>Maximum‐likelihood and Bayesian approaches identified shifts in diversification rate and possible links to character evolution. We inferred the ancestral environment for <italic>Viburnum</italic> and changes in diversification dynamics associated with subsequent biome shifts.</p> </list-item> <list-item> <p> <italic>Viburnum</italic> probably diversified in tropical forests of Southeast Asia in the Eocene, with three subsequent radiations in temperate clades during the Miocene. Four traits (purple fruits, extrafloral nectaries, bud scales and toothed leaves) were statistically associated with higher rates of diversification. However, we argue that these traits are unlikely to be driving diversification directly. Instead, two radiations were associated with the occupation of mountainous regions and a third with repeated shifts between colder and warmer temperate forests.</p> </list-item> <list-item> <p>Early‐branching depauperate lineages imply that the rare lowland tropical species are 'dying embers' of once more diverse lineages; net diversification rates in <italic>Viburnum</italic> likely decreased in these tropical environments after the Oligocene. We suggest that 'taxon pulse' dynamics might characterize other temperate plant lineages.</p> </list-item> </list> </p> </abstract>