Lecture_11_Energy&Nutrients_11 Feb2011

Lecture_11_Energy&Nutrients_11 Feb2011 - Scales of...

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Unformatted text preview: Scales of Ecological Investigation: We are still working within the Individual or Organism level of ecological organization. All living things require Chapter 7 Energy and Nutrient Relations Energy & Matter Trophic = feeding Trophic dynamics = transfer of energy from one part of the ecosystem to another Autotrophs = self feeders Heterotrophs = other feeders Energy sources for autotrophs 1. Light (photoautotrophs) 1. Chemical transformations of inorganic molecules (chemoautotrophs) Energy sources for heterotrophs Chemical breakdown of organic compounds. 1. Herbivores eat plants 2. Carnivores eat animals 3. Omnivores eat both 4. Detritivores eat dead tissues 1. Others? Conclude: Bacteria RULE! What trophic category are fungi? Heterotrophs Heterotrophs Solar radiation is the source of energy for photoautotrophs What is light? Light is defined as both particles (photons) and waves. The wavelength of light determines its color and its energy content. Short wavelengths (ultraviolet < 400 nm) have high energy Long wavelengths (infrared > 700 nm) have low energy (heat) Between these two extremes is the visible spectrum = 700 nm to 400 R O Y G B I V Is it a coincidence that the visible range of light is the same as photosynthetically active radiation (PAR)? Two trivia questions: Why are photosynthetic plants green? Why do leaves change color in the autumn? Autumn leaves are colorful because plants stop producing chlorophyll (so they can recycle the N contained in it). When the chlorophyll is gone, we can see other pigments. Carotenoids look yellow and red because they reflect these wavelengths Photosynthesis 6 CO 2 + 6 H 2 O C 6 H 12 O 6 + 6 O 2 Respiration Memorize this II. Two steps in photosynthesis (the light independent portion) 1. carbon fixation (capture of CO 2 ) 2. sugar production (Calvin cycle) Plants utilize three main photosynthetic pathways: 1. C 3 2. C 4 3. CAM The C...
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This note was uploaded on 04/12/2011 for the course BIO 326 taught by Professor Gehring,c during the Spring '08 term at N. Arizona.

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Lecture_11_Energy&Nutrients_11 Feb2011 - Scales of...

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