W09_L3_Functional_Diversity

W09_L3_Functional_Diversity - Functional Diversity I:...

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Functional Diversity I: Acquiring Resources • Thinking about Wednesday – What similarities can you draw between coastal ocean upwelling, the Delta breeze, and the northeast trade winds? – Thinking about broad scale patterns of biodiversity, would you predict the Sierras to be more or less diverse than the Central Valley? What forces might help to make it more diverse; what might help to make it less diverse? Jan. 9, 2009 THE CLICKER QUESTION A. I favor using clickers for educational purposes only. These will be integrated into lecture as discussion and learning tools; working through some practice questions. These will not count toward my grade. B. I favor using the clicker questions as above, but having them count toward my grade as specified in the previous slide. Functional Diversity I Today’s (Jan 9) themes Acquiring resources – (added reading: section 8.2, skim section 8.4) • Trade-off’s – Why are there ~50 million species, anyway? Why aren’t there a much smaller subset that dominate their environments. • If all plants, basically, convert solar energy into carbohydrates and use this and soil nutrients for growth, why aren’t there a few in each location that perform so much better than all the others that they dominate and exclude all others? • Terminology – part of that list of things you need to remember TERMINOLOGY , part 1 Autotrophs : make food (energy) from inorganic materials Photoautotrophs : use light as the energy source to make food (energy) from inorganic materials Chemoautotrophs : derive their energy from chemical reactions (e.g., methanogens, halophiles, thermoacidophiles) Heterotrophs : derive energy (food) from other organisms (organic sources) Primary production is a function of not just light and carbon dioxide but also nutrients and trace minerals: --106 CO 2 + 90 H 2 O +16 NO 3 + PO 4 + trace minerals = biomass + 150 O 2 Photosynthesis: 6CO 2 + 6H 2 OC 6 H 12 O 6 + 6O 2 light nutrients 6CO 2 + 6H 2 6 H 12 O 6 + 6O 2 Respiration: It is this light that autotrophs can use for photosynthesis A relatively narrow range of light wavelengths actually arrives at the Earth’s surface
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Chlorophyll a - primary light harvesting pigment of green plants How is the energy in light harvested?
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W09_L3_Functional_Diversity - Functional Diversity I:...

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