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Chapter04-1

Chapter04-1 - www.thebiggestpicture.org XCredit 5 pt per...

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Unformatted text preview: www.thebiggestpicture.org XCredit 5 pt per day Sign attendance each day Quizzes take a while to grade (at least one week) we hope to have them all done by tomorrow Biological Communities and Species Interactions Part I : Evolution After studying the 1 st ½ of Chapter 4 you should: know about biodiversity , why it’s important in evolution, ways it is decreased understand concepts of evolution , natural selection , fitness , and speciation understand common evolutionary scenarios ( convergent , divergent , co-evolution , mimicry ) know about mass extinctions (including anthropogenic extinction ) Biodiversity total amount of biological variation in a given area. Necessary for stability of environmental systems. Necessary for pop’ns to be able to adapt when the environment changes (i.e., evolve). • Genetic Diversity • Habitat Diversity • Species Diversity Examples Biodiversity Facts: • Most spp concentrated in " Biodiversity Hot Spots " • There are at least 30 M spp on Earth ( maybe 100M ) • Over past 3.5 B yr, 99.9% of all spp that ever lived have gone extinct • 90% known spp . R terrestrial & fw (mostly tropical) • Remaining 10% known spp R marine • Most known phyla have marine representatives ¡ 31 of 32 phyla marine (14 / 32 marine- endemic ) ¡ 18 of 32 phyla terr & fw (1 / 32 terr- endemic ) • Natural (background) rate of extinction 0.25 sp / yr • Anthropogenic extinction rate is 20,000 spp / yr VIMP !...
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Chapter04-1 - www.thebiggestpicture.org XCredit 5 pt per...

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