species distribution modeling; Mimosoideae; next generation sequencing; biogeography; Lupinus; phylogeny; biodiversity; Leguminosae
Contreras-Ortiz Natalia, Atchison Guy W, Hughes Colin E, Madriňán Santiago (2018), Convergent evolution of high elevation plant growth forms and geographically structured variation in Andean Lupinus (Fabaceae), in Botanical Journal of the Linnean Society
, 187(1), 118-136.
Hughes Colin (2017), Are there many different routes to becoming a global biodiversity hotspot?, in Proceedings National Academy of Sciences, U.S.A.
, 114, 4275-4277.
Atchison G. W., Nevado B., Eastwood R. J., Contreras-Ortiz N., Reynel C., Madrinan S., Filatov D. A., Hughes C. E. (2016), Lost crops of the Incas: Origins of domestication of the Andean pulse crop tarwi, Lupinus mutabilis, in American Journal of Botany
, 103(9), 1592-1606.
Nevado Bruno, Atchison Guy W., Hughes Colin E., Filatov Dmitry A. (2016), Widespread adaptive evolution during repeated evolutionary radiations in New World lupins, in Nature Communications
, 7, 12384-12384.
The uneven geographic distribution of evolutionary lineages and diversity across the planet is one of the most striking and pervasive features of biodiversity. Understanding the processes and factors that determine the spatial distribution of life on Earth and how diversity evolves are central goals of evolutionary biology. Using comparative approaches and one of the most evolutionary successful families of flowering plants, the legumes as a study system, this proposal aims to address a set of inter-related questions about global plant diversity patterns: (i) what are the geohistorical and ecological processes that shape the global distribution of plant species diversity and the geographic turnover of phylogenetic clades across space? (ii) What are the environmental, ecological and geohistorical factors constraining clades in space? (iii) What are the relative contributions of dispersal limitation and phylogenetic niche conservatism in generating global patterns of diversity? (iv) Are there correlations between rates of species diversification and rates of niche evolution? (v) Do diversification rate shifts coincide with biome shifts, and to what extent do diversification trajectories vary amongst evolutionary lineages, geographical regions and biomes?To address these questions we will make use of recent developments in comparative phylogenomics and global-scale species distribution modelling to quantify phylogenetic turnover and the ecological factors underlying patterns of diversity across two complementary global-scale ecological gradients: one in the tropical lowlands using mimosoid legumes as the study clade, and the other spanning temperate lowlands and mountains using the genus Lupinus. Both these gradients extend across a broad spectrum of environmental conditions and vegetation types as well as multiple continents separated by geographical disjunctions. For both study clades we will generate new genome-scale DNA sequence datasets using NGS approaches to generate robust, large and densely sampled phylogenies spanning broad phylogenetic, geographical and ecological ranges. Using burgeoning new sources of species occurrence data, we will generate species distribution models to provide objective, quantitative, statisically testable and geographically resolved ecological output values incorporating both geography and the environment. By modelling the spatial distribution of species or clades and correlating the ranges along climatic gradients with their phylogenetic relatedness, the historical and ecological factors that determine species diversity patterns can be studied within a single framework. By incorporating diversification rates estimated across all branches of the phylogenies, this provides a powerful approach to determine the factors and processes underlying the uneven spatial distribution of biodiversity.