BISC 102 Lecture 19: Adaptive Radiations & Extinction- Lecture Notes
10 Aug 2016
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What are we doing today? what is macroevolution? adaptive radiations mass extinctions. Microevolution evolution on a small scale changes in allele frequency within a species processes: natural selection, drift, mutation focus on changes in living species. Macroevolution evolution on a large scale, as seen through the history of life patterns of stasis, change, origin of new lineages, and extinction often informed by the fossil record. Adaptive radiation one twig that splits into two (simple) speciation adaptive radiation is a sudden and rapid diversi cation of a phyletic line into several lineages. Causes? archipelago new habitat new food sources speciation by island hopping the ancestral nch lived on the south. 2nd most diverse order of mammals very large order radiated - 50mya we know this from the fossil record.
