Biotic abiotic-cycles
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Biotic abiotic-cycles






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Biotic abiotic-cycles Biotic abiotic-cycles Presentation Transcript

  • The Living Earth How ecosystems interact and the cycles that affect them. Red - Write it Blue - Highlight it
  • 1. Biosphere
    • The part of Earth that supports life.
      • Top portion of the crust
      • All water on the surface
      • The surrounding atmosphere
    • Made up of many different biomes (environments) that are home to different kinds of organisms.
  • 2. Eco systems
    • All the living organisms (biotic) in an area AND the nonliving (abiotic) features of the environment.
      • Eco logy: the study of interactions occurring between organisms and their environment.
      • Population: all organisms of the same species.
      • Community: all the populations in the ecosystem.
    • Biotic Features:
    • Turtle
    • Plants
    • Larvae
    • Fish
    • Crayfish
    • Abiotic Features:
    • Energy
    • Water
    • Oxygen
    • Dirt
    • Fertilizers
  • 3. Carrying Capacity & Limiting Factors
    • Carrying Capacity: the greatest number of individuals that an ecosystem can sustain.
    • Limiting Factors: anything in the ecosystem that would inhibit continued growth of the system. Such as amounts of:
      • Sunlight
      • Food
    • Both of these lead to . . .
      • Individuals and populations fighting each other for available resources.
    3. Water 4. Minerals Competition:
  • 4. Changing Ecosystems : Primary Succession
    • Begins in places WITHOUT soil(rock only).
    • Pioneer species (lichens, algae and fungus) grow on rock
    • New soil forms as weather and erosion break down rock
    • Decaying plants add organic material to create healthy soil
    Climax Community : the stable stage of ecological diversity and balance. Example: -Volcanic Eruption
  • Primary Succession Example - Hawaii Because Mauna Loa and Kīlauea are active volcanoes, the island of Hawaii is still growing. Between January 1983 and September 2002, lava flows added 543 acres to the island.
  • 5. Changing Ecosystems: Secondary Succession
    • Begins in a place that has soil AND once had living organisms.
    • Happens faster than primary and will have different pioneer species.
    • Examples:
    • Fire
    • building removal
    • Agriculture
  • Example Secondary Succession
    • Mt. St. Helens
  • 6. Other Cycles Affecting Ecosystems : Nitrogen Cycle
    • Approximately 80% of the molecules in Earth’s atmosphere are nitrogen.
    • Bacteria in the soil breaks down or fixes (fixes) the nitrogen into usable form.
    • Decaying plants and animals along with animal waste return the nitrogen to the soil
    • Lightning
    • Nitrogen is used by all plants and animals to make amino acids, proteins, and DNA.
  • 7. Other Cycles Affecting Ecosystems: Carbon Cycle
    • It is found in the atmosphere attached to Oxygen as CO 2 .
    • Due to human action (burning fossil fuels, etc.), there is nearly 30% more Carbon in the atmosphere now than only 150 years ago.
    • Carbon is used by plants in photosynthesis, to make energy-rich molecules (food).
  • 8. Other Cycles Affecting Ecosystems: Water Cycle
    • Removing heat causes condensation, turning water vapor into a liquid.
    • Clouds lose water (rain or snow) as precipitation.
    • Precipitation is either absorbed into the ground or runs off into rivers. (filtration, run-off and accumulation)
    • Adding heat causes evaporation , turning liquid water into water vapor.