ECOLOGY AND ECOSYSTEMS

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ECOLOGY AND ECOSYSTEMS
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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
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SYMBIOSIS
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Predation

• Predator EATS Prey
• The populations cycle
• Predator has lower curve
• There cant be more predators than prey

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Population GROWTH

• EXPONENTIAL GROWTH

• Logistic growth

• J-curve
• Occurs when unlimited resources are available

• S-curve
• Occurs because resources are limited
• Carrying capacity reached

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HUMAN POPULATION GROWTH

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

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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

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BE A GOOD STEWARD