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Chapter 55 Ecosystems

Chapter 55 Ecosystems. Relationships, I. Trophic structure/levels - feeding relationships in an ecosystem Primary producers - the trophic level that supports all others; autotrophs Primary consumers - herbivores Secondary and tertiary consumers - carnivores

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Chapter 55 Ecosystems

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  1. Chapter 55 Ecosystems

  2. Relationships, I • Trophic structure/levels - feeding relationships in an ecosystem • Primary producers - the trophic level that supports all others; autotrophs • Primary consumers - herbivores • Secondary and tertiary consumers - carnivores • Detrivores/detritus - special consumers that derive nutrition from non-living organic matter • Food chain - trophic level food pathway

  3. Relationships, II • Food webs- interconnected feeding relationship in an ecosystem

  4. Energy Flow, I • Primary productivity (amount of light energy converted to chemical energy by autotrophs) • •Gross (GPP): total energy • •Net (NPP): represents the storage of energy available to consumers • •Rs: respiration • NPP = GPP - Rs • Biomass: primary productivity reflected as dry weight of organic material • Secondary productivity: the rate at which an ecosystem's consumers convert chemical energy of the food they eat into their own new biomass

  5. Energy Flow, II • Ecological efficiency: % of E transferred from one trophic level to the next (5-20%) 10% Rule • Pyramid of productivity: multiplicative loss of energy in trophic levels • Biomass pyramid: trophic representation of biomass in ecosystems • Pyramid of numbers: trophic representation of the number of organisms in an ecosystem

  6. Chemical Cycling • Biogeochemical cycles: the various nutrient circuits, which involve both abiotic and biotic components of an ecosystem • Water • Carbon • Nitrogen • Phosphorus

  7. Water Cycle

  8. Carbon Cycle

  9. Nitrogen Cycle

  10. Phosphorous Cycle

  11. Human Impact • Biological magnification: trophic process in which retained substances become more concentrated at higher levels • Greenhouse effect: warming of planet due to atmospheric accumulation of carbon dioxide • Ozone depletion: effect of chlorofluorocarbons (CFC’s) released into the atmosphere • Rainforest destruction • Cause: Overpopulation?

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