lecture19

lecture19 - Effects of increased temperature Studies of...

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Climate Change 2 7 July 1 Greenhouse effect – warming of the Earth caused by higher concentrations of gases that absorb heat Greenhouse gases Global Carbon Cycle Pools = 10 12 kg Fluxes = 10 12 kg/yr
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Climate Change 2 7 July 2
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Climate Change 2 7 July 3 Sea levels are rising Permafrost (layer of frozen soil) in artic tundra is melting, leading to increased greenhouse gases Temperature is increasing Effect of increased CO 2 on plants Fertilization effect – increased growth rate Short-term enhancement decreases in the long term Ecological Impacts Levels off at high concentrations of CO 2 May not occur when nutrients are in short supply
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Climate Change 2 7 July 4 Coral reefs are bleaching Species distributions are changing Ex. Studies of butterflies by Camille Parmesan Diseases are spreading
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Unformatted text preview: Effects of increased temperature Studies of frogs by Alan Pounds Climate Change 2 7 July 5 Percent of frog species that became extinct on a mountain in Costa Rica Outbreaks of herbivorous insects in forests Ex. Study of caterpillars on pine trees in Spain Climate Change 27 July 6 Effects of Climatic Variability (instability) Study of parasitism of caterpillars by Stireman et al. Negative correlation between parasitism rate and annual variation in precipitation. Impact of hurricanes on food webs in the Bahamas Reduction in predator abundances Herbivory increases markedly following hurricanes Causal mechanisms: Higher susceptibility of plants to herbivores Seaweed deposition...
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This note was uploaded on 01/06/2010 for the course EVE 101 taught by Professor Strong,d during the Spring '08 term at UC Davis.

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lecture19 - Effects of increased temperature Studies of...

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