BIOL 2040 Lecture Notes - Lecture 22: Global Warming, Even-Toed Ungulate, Global Cooling
19 Apr 2016
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Quick quiz: historical events in order: first multicellular organisms, radiation of animal phyla, first land plants, permian mass extinction (250 mya, first mammals, dinosaur period, mammals radiate, woolly mammoth extinction. Survivorship curves: straight line random extinction at all ages. Likelihood of a species going extinct is the same at any age of the species lineage. Same as survivorship curve for some individuals: likelihood of dying is the same at every age. 90% of individuals die between ages 0 1. 90% of survivors to age 1 die between ages. Relating likelihood of a species going extinct to that species age o: straight line. Probability of extinction is independent of species age. Species lineages do not get old and die chance of going extinct unrelated to age of lineage. Big five: ordovician, devonian, permian, triassic, cretaceous. Most evidence of extinction is from marine animals.
