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Biome Evolution and Biogeographical Change Through Time Christine D thesis abstract ISSN 1948-6596 Biome evolution and biogeographical change through time Christine D. Bacon Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden; Laboratorio de Biología Molecular (CINBIN), Escuela de Biología, Universidad Industrial de Santander, Bucaramanga, Colombia; [email protected] Abstract. Keystone plant groups can be used to infer the evolution of biomes and biogeographical change of communities and taxa. In this thesis I investigated whether lineages in Trachycarpeae palms could be used to track different forest types through time and whether change in biome or bio- geographic region had an effect on species diversification. These questions were approached using ge- netic data integrated with fossil record, species distribution, and speciation models. Although the three chapters of my thesis had additional foci outside of the main goal of inferring biogeographic change and diversification through time, they come together to paint a clear picture of how fine-scale and interdisci- plinary studies can lead to more robust hypothesis testing and conclusions. I found that outside of track- ing tropical forests through time, palms are useful for understanding island biogeography and the for- mation of other types of biomes. Keywords. Arecaceae, biogeography, macroevolution, phylogeny Introduction ies of biodiversity and biogeography, other model The inference of biogeography and diversification groups have proved equally important. One exam- is an integral window into the past that enables ple lies in leguminous plants, where studies have the investigation of how geographic regions, bi- shown that endemic legume clades track South omes, and communities are assembled through American seasonally dry tropical forests (SDTF) time and how they may evolve in the future. By through time (Pennington et al. 2010, Särkinen et integrating data, for example from geology, genet- al. 2012). These clades are geologically old and ics, fossils, species distribution and abundance, evolutionary distinct, as evidenced by the deep and morphology, we can reach a more compre- divergences within and amongst species. These hensive framework for the understanding of bio- studies suggest that SDTFs are ancient biomes geographical evolution (Figure 1). The importance that were separated by the rise of the Andes and of these types of studies reaches beyond basic could be excellent models for understanding vi- biodiversity science and the discovery of impor- cariance processes if complemented with ances- tant evolutionary processes, and underscores cut- tral area analysis. Another model plant group for ting edge conservation research (Rolland et al. understanding biome evolution is the palms 2011). Understanding how biodiversity evolved (Couvreur and Baker 2013). Because palms are can inform modeling of the past, present and fu- primarily restricted to the tropics and subtropics ture of that biodiversity and can aid in, for exam- due to structural constraints, they represent key- ple, the design of protected areas that take into stone tropical rainforest (TRF) clades. A recent account diverse evolutionary processes (Sarker et study by Couvreur et al. (2011) inferred that a TRF al. 2006), or the definition of how climate change -like biome was present in Laurasia during the mid may affect the future availability of resources -Cretaceous, suggesting that ancient and steady (Piao et al. 2010). evolutionary processes contribute to the present The use of model groups to understand day species richness in TRFs. One caveat of their evolutionary patterns is commonplace, particu- analysis is that it was based on a genus-level phy- larly in systems like Drosophila (Drosophila 12 Ge- logeny that, even with missing species grafted nomes Consortium 2007) and Arabidopsis (Koch onto appropriate branches, is not robust to the and Matschinger 2007), but for evolutionary stud- sampling bias introduced in the diversification frontiers of biogeography 5.4, 2013 — © 2013 the authors; journal compilation © 2013 The International Biogeography Society 227 biome evolution Figure 1. By integrating data—for example from geology, genetics, fossils, species distribution and abundance, and morphology—a more comprehensive framework for the understanding of biogeographical evolution can be reached. For example, to infer the timing and geographic location of desert biomes a time-calibrated molecular phylogeny of endemic desert lineages can be reconstructed and species distributions and diversification rates (r = diversification rate, λ = speciation rate, μ = extinction rate) are optimized on the tree. Taken together, these results can be used to understand the evolutionary processes that contribute to the formation of this biome and its respective biota. Photo by John Dransfield with permission. models (Cusimano and Renner 2010). stand plant evolutionary processes, such as in- To infer biome evolution and biogeographi- complete lineage sorting and hybridization (Bacon cal change through time, my dissertation focused et al. 2012b). Lastly, to understand the relative on Trachycarpeae palms. Trachycarpeae encom- importance of taxonomic identity and bio- passes three insular radiations found in the Ha- geographic area in shaping the patterns of diversi- waiian Islands, the Caribbean, and the area sur- fication and forming the bimodal biogeographical rounding Wallace’s Line. My first goal was to un- pattern observed in palm lineages in the South- derstand the common evolutionary processes that east Asian region, the tempo and mode of species contributed to the repeated diversification on is- diversification were inferred for a clade distrib- lands in the tribe (Bacon et al. 2012a). Focusing on uted across Wallace’s Line (Bacon et al. 2013a). the Hawaiian radiation, species delimitation meth- What sets this dissertation apart from previous ods were compared to not only robustly infer spe- studies is the fine scale view of biogeographical cies diversity and biogeography, but also to under- processes that was achieved by incorporating dif- 228 frontiers of biogeography 5.4, 2013 — © 2013 the authors; journal compilation © 2013 The International Biogeography Society Christine D. Bacon ferent types of data—phylogeny, fossil, species set of topologies) to infer ancestral areas in time distributions, population genetics—and mathe- across the phylogeny and with these results, bio- matical models, which were analyzed in a comple- geographic events such as dispersal, vicariance, mentary fashion (divergence times, biogeography, cladogenesis, and local extinction are inferred. In diversification) to examine biome evolution and the dissertation study, both RASP (Yu et al. 2010) biogeographical patterns. and DEC were implemented to infer the geo- graphic change in ancestral distribution areas Methods through time in Trachycarpeae lineages. To understand evolutionary processes of biome A fundamental question in evolution in- evolution based on DNA sequence data, we used a volves the factors that influence speciation and fossil calibrated molecular phylogeny. The most extinction. For example, has the evolution of a cited method for estimating divergence times is particular trait or the dispersal into a bio- conducted in a Bayesian framework (BEAST; geographic region increased speciation rates? The Drummond et al. 2006), which is desirable consid- estimation of diversification rate has improved in ering that uncertainty in topology and calibration recent years and many advances towards under- points can be explicitly incorporated. For Trachy- standing the interplay between speciation and carpeae, a review of the fossil palm record re- extinction have been made (Alfaro et al. 2009, vealed three macrofossils that were well dated Stadler 2011). In Trachycarpeae lineages distrib- and sufficiently known to confidently place con- uted across Wallace’s Line, I compared the likeli- straints on nodes leading to certain taxa (Bacon et hoods of various models of diversification to de- al. 2012a). Calibrations were set at nodes using a termine whether constraints associated with ei- lognormal distribution with the mean age of the ther taxonomic identity, biogeographic area, or fossil used as the offset value of the lognormal both have contributed to shape the patterns of curve and the standard deviation encompassing diversification observed in the clade of Southeast the variation in age of the fossil strata (Ho 2007). Asian palms. A Yule tree prior was used, which assumes a con- stant lineage birth rate for each branch in the Results tree, and is the most suitable for species-level Examining the three datasets in this dissertation phylogenies (Heled and Drummond 2012). After allowed for the inference of tempo and mode of five independent iterations of 50 million MCMC diversification in Trachycarpeae palms. Higher- chains, results were compared, combined, and level relationships and the inference of their an- examined for convergence. cestral areas show dispersal and vicariance events With a calibrated phylogeny, the temporal across the tree corresponding to geological proc- information of clades can be used to infer the ori- esses such as tectonic plate movement and the gin and biogeographical evolution across the tree. emergence of land bridges. The number of disper- New methods in biogeographical analysis have sal events inferred for the island lineages was par- been advancing the field at a rapid rate. For exam- ticularly high and primarily
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