SC BIOL 301 - Ecosystem Ecology (5 pages)

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Ecosystem Ecology

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Ecosystem Ecology


Primary Productivity, Net Productivity, Movement of Energy, Hydrologic Cycle, Carbon Cycle

Lecture number:
Lecture Note
University Of South Carolina-Columbia
Biol 301 - Ecology and Evolution

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Biol 301 1st Edition Lecture 19 Outline of Last Lecture I Community Boundaries II Community Diversity III Species Diversity IV Community food webs V Community Stability Outline of Current Lecture II Primary Productivity III Net Productivity IV Movement of Energy V Hydrologic Cycle VI Carbon Cycle Current Lecture Primary Productivity Where sunlight is not available e g deep ocean thermal vents producers rely on chemosynthesis as their source of energy Producers harness energy and form the basis of food webs Producers use energy for respiration growth and reproduction The energy used for growth and reproduction is the energy available to consumers Primary productivity the rate at which solar or chemical energy is captured and converted into chemical bonds by photosynthesis or chemosynthesis Standing crop the biomass of producers present in a given area of an ecosystem at a particular moment in time Ecosystems with high primary productivity may not have a high standing crop consumers may eat it as quickly as it grows Gross primary productivity GPP the rate at which energy is captured and assimilated by producers in an area Net primary productivity NPP the rate of energy that is assimilated by producers and converted into producer biomass in an area includes all energy that is not respired NPP GPP Respiration Both GPP and NPP are expressed in units of Joules J m2 year These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Primary productivity is a rate the choice of how to measure this rate depends on the particular ecosystem being studied NPP can be measured as the change in producer biomass over time Researchers harvest plants to determine mass of growth over a period of time Substantial amounts of herbivory or tissue mortality will lead to an underestimation of NPP Researchers may estimate the biomass lost to herbivory or tissue mortality Researchers typically only

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