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Ecological efficiency

Chapter 3 Notes

Subject: 
Environmental Science
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Biology
Ecology
Systems ecology
Primary production
Ecological efficiency
Food web
Ecological pyramid
Trophic level
ecosystem
Terrestrial ecosystem
Photosynthesis
Nutrient cycle
Environment

Chapter 3 Notes Ecosystem Boundaries Biotic and abiotic components of an ecosystem provide the boundaries that separates them from one another Some have a well-defined boundaries: Like a cave Scientist might define a terrestrial ecosystem as the range of a particular species of interest Ecosystems occur in a wide range of sizes Ecosystem Process Each ecosystem interacts with surrounding ecosystems Change in ONE ecosystem can affect the global environment Photosynthesis and Respiration Nearly all of the energy that powers ecosystems comes from the sun Plants, algae and other organisms have the ability to convert the suns solar energy to usable from of energy, these are called producers/autotrophs

CH 54 Bio Notes

Subject: 
Biology
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Biology
Ecology
Primary production
Biomass
Ecological efficiency
Trophic level
Solar Energy
Productivity
Ecological pyramid
Ecosystem ecology
Environment

Primary productivity aka BIOMASS B/c some ecosystems are better at converting solar energy then others, we calc PP to indicate how efficient a partic ecosys is @ convert solar energy *Expressed as a Biomass/Rate-- The dry mass of vegetation produced per unit time (g/m2/yr) Aka BIOMASS The amt of light energy converted to chemical energy in a given amt of time Gross (Total) Primary Productivity (GPP) Not all of all the chemical energy produced is available to be passed on to primary consumers Autotrophs (primary producers) use some of energy themselves for cellular respiration Total primary productivity of an autroph Total amt of energy fixed by plants Net primary productivity (NPP) [GPP] ? [Energy Used by Autotrophs] = [NPP] Expressed as biomass per square meter/yr
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