BIOL 115 Lecture Notes - Lecture 21: Invasive Species, Genetic Variation, Coevolution
Document Summary
Adaptive radiation: when eclipses many separate lineages, big bursts of radiation of groups of species. Group has diversified ecologically into 25-30 species. Most common ancestor is with the california tarweed. It somehow dispersed to the hawaiian islands. They are volcanic islands, not a long history of their own ecosystems. Some dispersal event from an organism that shares ancestors with the. Was able to diversify due to the amount of open space they were. Adaptive radiation and convergent evolution able to spread to. Evolutionary lineages that have undergone exceptionally rapid diversification into a variety of lifestyles or ecological niches. Lakes have lots of open spaces to be filled. Clades evolve to occupy ecological niches in the absence of competition (e. g. , Clades may radiate because new adaptations, known as key innovations, evolve that allow them to occupy habitats or adaptive zones that were not available to other lineages (see table 14. 1) islands, lakes, or extinction examples)
