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ECOLOGY AND ECOSYSTEMS

ECOLOGY AND ECOSYSTEMS. Food CHAINS. Original source of energy for most chains is the sun 1 st trophic level is producer 2 nd trophic level is primary consumer 2rd trophic level is secondary consumer Decomposer not shown on chain, but they recycle nutrients.

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ECOLOGY AND ECOSYSTEMS

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  1. ECOLOGY AND ECOSYSTEMS

  2. Food CHAINS • Original source of energy for most chains is the sun • 1st trophic level is producer • 2nd trophic level is primary consumer • 2rd trophic level is secondary consumer • Decomposer not shown on chain, but they recycle nutrients Energy is “lost” as you mover “up” the food chain

  3. SYMBIOSIS

  4. Predation • Predator EATS Prey • The populations cycle • Predator has lower curve • There can’t be more predators than prey

  5. Population GROWTH EXPONENTIAL GROWTH Logistic growth S-curve Occurs because resources are limited Carrying capacity reached • J-curve • Occurs when unlimited resources are available

  6. HUMAN POPULATION GROWTH • Overpopulation of humans leads to • Destruction of habitats (pollution and/or destroying) • Loss of biodiversity • Introduced species • Outcompete nativespecies

  7. Carbon CYCLE • Cycling of carbon and oxygen • Three main processes • Photosynthesis – plants use carbon dioxide; produce oxygen • Respiration – uses oxygen, produces carbon dioxide (both plants and animals) • Combustion – burning – releases more carbon dioxide • Greenhouse Effect • Carbon dioxide traps heat in the atmosphere, making life possible • Increased carbon dioxide can make temperatures rise more • Human activities can lead to GLOBAL WARMING

  8. BE A GOOD STEWARD

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