Chapter 54 ECOSYSTEMS

Chapter 54 ECOSYSTEMS - Humanimpacts...

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Human impacts
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Definition:  all of the organisms that live in  an area and their chemical/physical  environment. 4 components linked by the flow of  energy, fig 54.1: Abiotic environment = soil, climate,  atmosphere, dissolved substances in water. Primary producers Consumers – primary and secondary Decomposers
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Decomposer Organisms that feed on dead organisms or their waste products Consumers Organisms that eat other living organisms Primary producers (autotrophs) Organisms that can synthesize their own food Abiotic environment The soil, climate, atmosphere, and the particulate matter and solutes in water External energy source, usually solar energy but also chemical energy
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Primary producers Autotrophs Use solar energy or inorganic chemical energy  to make food and structural molecules. Energy invested in growth of tissues = Net  Primary Productivity  (NPP)
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Consumers NPP from autotrophs is the source of food Herbivores and carnivores Decomposers Consume dead remains or waste products  (detritus ) of other organisms
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NPP Varies across the globe, figs 54.2 and 54.3 Highest in oceans and tropical rain forests,  lowest in deserts and tundra Limits:  sunlight, temperature and water in  terrestrial environments; nutrients and sunlight  in marine environments.  Also limited by area  encompassed by biome.
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NPP per unit area Area covered, by ecosystem type Total NPP Terrestrial Aquatic
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Energy transfer = trophic levels , fig 54.5 Organisms that obtain energy from the  same type of source occupy the same  trophic level. Food chains
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This note was uploaded on 09/08/2011 for the course BIOL 1403 taught by Professor Dini during the Fall '09 term at Texas Tech.

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Chapter 54 ECOSYSTEMS - Humanimpacts...

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