Format: ORAL

Laura Holzmeyer1, Francis J. Nge1, 2, Vincent Soul1, Thomas L.P. Couvreur1 Annonaceae Phylogenetics Consortium3

1 IRD, UMR DIADE, Université de Montpellier, Montpellier, France 2 National Herbarium of New South Wales, Australian Institute of Botanical Science, Royal Botanic Gardens and Domain Trust, Mount Annan, Australia 3 Annonaceae Global Phylogenetic Consortium (AGPC), http://www.couvreurlab.org/agpc

The evolution and processes leading to the remarkable biodiversity contained within tropical rain forests (TRF) have been subject to research for decades. Traditionally, at a macroevolutionary scale, two predominant contrasting hypotheses are generally debated the museum hypothesis, where low extinction rates lead to a constant diversification and a steady increase of diversity through time, and the cradle hypothesis, where increased speciation rates lead to rapid bursts of diversity. To date, most studies were based on regional or limited global taxonomic sampling spanning either recent or deep time scales. These studies suggested a more nuanced view with a mixed or neutral model of high species turnover, implying both elevated speciation and extinction rates in TRF. Here, we reconcile deep and recent time scales to test these hypotheses by generating for the first time a global near complete species level dated phylogenetic tree of the major TRF family Annonaceae Juss. (ca. 2000 out of 2450 species). Using this framework, we tested both hypotheses using different macroevolutionary methods and statistics. I shall present the major results obtained from these analyses and implications for our understanding of TRF evolution through time at global scales. Our study marks a significant advancement in understanding TRF evolution, by presenting the first comprehensive species-level phylogenetic tree of one of the oldest rain forest angiosperm families on a global scale.