![]() ![]() Major evolutionary patterns in Scalesia include the following: (1) lack of compliance with the “progression rule” hypothesis, in which earlier diverging lineages are expected to occupy older islands (2) a predominance of within-island speciation over between-island speciation and (3) repeated convergent evolution of potentially adaptive traits and habitat preferences on different islands during the course of diversification. Results support a Pliocene to early Pleistocene divergence between Scalesia and the closest South American relatives, and rapid diversification of extant Scalesia species from a common ancestor dated to the Middle Pleistocene. Here, we report a time-calibrated phylogenomic analysis based on genotyping-by-sequencing data of the 15 species of Scalesia (Darwin’s giant daisies), an iconic and understudied plant radiation endemic to the Galápagos Islands and considered the plant counterpart to Darwin’s finches. 1 2 Starting with a single ancestor, this process. such as islands, departed habitats or new food. In evolutionary biology, adaptive radiation is a process in which organisms diversify rapidly from an ancestral species into a multitude of new forms, particularly when a change in the environment makes new resources available, alters biotic interactions or opens new environmental niches. However, lack of resolution of species relationships has historically hindered their investigation, particularly in the plant kingdom. the diversity of life on earth theoretical role of ecological opportunity as the trigger. Island radiations can provide key insights for understanding rapid speciation, including evolutionary patterns and the processes behind them. Evolutionary radiations on oceanic islands have fascinated biologists since Darwin’s exploration of the Galápagos archipelago. ![]()
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