BIOL 2400 Lecture Notes - Lecture 10: Sulfur Dioxide, Biogeography, Anthropocene
12 Sep 2017
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Document Summary
How can we track species diversity through time: population ecology, macroevolution, where dt is the diversity (total number of species in a clade) at time t. Diverse taxa have higher origination rate than extinction rate: origination rate = (alpha) Standing diversity number of taxa in a place at some time: (cid:3118) (cid:3117) = , turnover rate total number of species eliminated or replaced per unit time. Evolutionary lineages that have undergone exceptionally rapid diversification into a variety of ecological niches. The ultimate fate of all species: mass extinctions. Intervals when over 60% of species that were alive went extinct: background extinctions, other extinction events outside of a mass extinction, 5+ mass extinction events, marine invertebrates and vertebrates, cretaceous-tertiary (k-t) mass extinction (65 mya) Large asteroid (~15km wide) hit earth and left 180km crater in yucatan: dust, wildfires, earthquakes, volcanoes, tidal wave.
