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25 meanvalue frequency 02 015 01 005 0 5 25 45 65 85

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Unformatted text preview: akes future specia4on events very difficult to predict So, what about ex4nc4on? •  Let’s see how much you remember… How is modern‐day ex4nc4on different from historical paherns? 1)  The range of taxa going ex4nct 2)  The propor4on of taxa going ex4nct 3)  The speed at which taxa are going ex4nct Which is not characteris4c of past mass ex4nc4ons? 1)  They occurred at roughly constant 4me intervals 2)  Ex4nc4on rates were variable across the globe 3)  Marine forms were immune from ex4nc4on Which ex4nc4on event caused the greatest loss of biodiversity? 1)  2)  3)  4)  5)  Ordovician (440 mya) Devonian (370 mya) Permian (245 mya) Triassic (210 mya) Cretaceous (65 mya) Which of the following is not a possible explana4on for the K‐T ex4nc4on? 1)  Human habitat exploita4on 2)  Meteor 3)  Volcanic ac4vity Species Ex4nc4ons in the Phanerozoic (543 million years) 0.25 Mean value Frequency 0.2 0.15 0.1 0.05 0 5 25 45 65 85 Percent extinction per 1 MY David Raup. 1994. PNAS 91: 6758 100 150 Nau 0 Na...
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