CLAB20H3 Midterm: Lecture22.pdf
9 Feb 2015
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Document Summary
What are the threats to biodiversity? overexploita3on habitat destruc3on biological invasions: climate change. Ecosystem func3on examples: carbon cycling, provision of habitat, nutrient cycling (e. g. n, p, produc3vity, stability, decomposi3on. Ecosystem services: bene ts people obtain from ecosystems, including provisioning services, regula3ng services, cultural services, and suppor3ng services. Ecosystem services: water ltra3on, pollu3on ltra3on, bu ering from natural disasters, food produc3on, wood produc3on, pollina3on, erosion control, climate regula3on, recrea3on, waste decomposi3on, provision of, etc pharmaceu3cals. Biodiversity & ecosystem func3on: 1994: two new experiments. David tilman and john downing, nature. Biodiversity and stability in grasslands . Shahid naeem et al. , nature. Declining biodiversity can alter the performance of ecosystems . Meanwhile, somewhere in the mountains of tennessee : 1997: michael huston claims that there are. Complementarity e ects a (e. g. naeem et al. 1994; tilman & downing 1994; diaz & cabido 2001; 2007; du y 2009; harmon et al. So which one is it: 1) grow each species in a monoculture.
