Ecology: Lecture 3

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Ecology Lecture 3
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Rain shadows
Smith and Smith, Fig. 2.5
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North vs. south facing slopes

• Smith and Smith, Fig. 2.16 2.17

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Effects of vegetation on temperature
Smith and Smith, Fig. 2.25
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Review key environmental factors affecting
distribution of organisms

• Temperature
• Moisture
• Nutrients
• Light

Campbell, 6th edition, Fig. 50.10
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Focus on light

• Characteristics that vary with climate/microclimat
  e
• wavelength
• intensity
• duration
• directionality

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Light energy as a function of latitude and time
of year

• Smith and Smith, Fig. 3.2

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PAR Photosynthetically active radiation
(400-740 nm)
Smith and Smith, Fig. 3.1
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Attenuation of light through water
Nybakken, Marine Biology
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Attenuation of light through vegetation

• Leaf area index (Smith and Smith, Figs. 3.5-3.6)

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P-I CurveSmith and Smith Fig. 6.6

• Smith and Smith Fig. 6.6

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Photoinhibition Smith and Smith Fig. 6.9

• Smith and Smith Fig. 6.9

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Photosynthesis reviewCampbell, Fig. 10.12
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Photosynthesis light-independent reactions
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Cost vs. benefit of rubisco reduction

• Use Smith and Smith, Fig. 6.7 to think about this

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Changes in leaf orientation

• Smith and Smith, Fig. 3.7

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Shade-tolerant vs. intolerant plants

• Smith and Smith, Fig. 6.9