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BS 110 Notes 10-6-2010 - iridium shocked quartz and...

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BS 110 Notes 10-6-2010 Maintaining Genetic Isolation Two Groups: o Prezygotic: Temporal – breed at different times Habitat – breed in different places Behavioral – different courtship procedures Gametic Barrier – mating does not occur because the gametes are incompatible Mechanical – mating does not occur because the reproductive genitalia are incompatible o Postzygotic: Hybrid Viability – hybrid offspring do not develop and die as offspring/embryos Hybrid Sterility - offspring develop to adults but are sterile Extinction The death of all the individuals of a species or other taxonomic group usually due to the failure to adapt to changing environmental conditions Background – processes of natural selection Mass – prune the tree of life K-T Asteroid Strike(~65 MYA) – crate - dust, ash, and soot blocked the sun >> global cooling and decreased productivity/acid rain. Evidence was presence of a metal called
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Unformatted text preview: iridium, shocked quartz, and microtektites. Conservation Biology • Developed to address the problems of habitat destruction and reduction in the numbers of individuals and species • Counteracts the biodiversity crisis • Causes of extinction associated with humans • Exotic Species – species of an organism that occurs in an area and should not. • Invasive Species – an exotic species that somehow harms the endemic organisms or habitat • Enemy Release Hypothesis – invasive species do well and spread rapidly because they have been released/liberated from their natural enemies when they occur in a new habitat. Since en does not go into defenses, it goes into growth and reproduction Exotic Species • 4600 species in North America • Means of invasion • 30% Plant life; Hawaii (>50%)...
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