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Ecology

Ecology. Study of interactions between organisms and their environments. Biotic Factors. Biosphere – life-supporting layer of Earth Biotic factors – all living organisms in a biosphere. Abiotic Factors. Nonliving factors in an environment Examples: Air currents Temperature

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Ecology

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  1. Ecology Study of interactions between organisms and their environments.

  2. Biotic Factors • Biosphere – life-supporting layer of Earth • Biotic factors – all living organisms in a biosphere

  3. Abiotic Factors • Nonliving factors in an environment • Examples: • Air currents • Temperature • Moisture • Light • Soil

  4. Organization of Life Biosphere Ecosystems Communities Populations Organisms

  5. Feeding Relationships • Autotrophs • Heterotrophs • Carnivores • Omnivores • Herbivores • Decomposers

  6. Trophic Relationships • Autotrophs • 1st level consumers (herbivores) • 2nd level consumers • 3rd level consumers • 4th level consumers (top predators)

  7. RULE OF 10 • Only 10% of energy is transferred from one trophic level to the next. • Example: • It takes 100 kgs of plant materials (producers) to support 10 kgs of herbivores • It takes 10 kgs of herbivores to support 1 kg of 1st level predator

  8. Symbiosis – “living together”

  9. Water cycle • Evaporation • Transpiration • Precipitation • Runoff • Groundwater

  10. Carbon cycle • Combustion • Photosynthesis • Respiration • Decomposition • Fossil fuels

  11. Nitrogen cycle • Atmospheric nitrogen • Runoff • Fertilizers • Decomposition • Nitrogen fixing • Synthesis of amino acids

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