1.3.4

Changes to Food Webs 2

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Changes to Food Webs - Factors

Abiotic and biotic factors affect organisms. Abiotic factors are non-living factors. Biotic factors are living factors.

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Abiotic factors

  • Abiotic factors affect the population of organisms in an ecosystem.
    • Abiotic factors are non-living factors.
  • Light is an abiotic factor.
    • Plants need light for photosynthesis.
  • Temperature is an abiotic factor.
    • Organisms can adapt to live in hot or cold environments.
    • Moisture is an abiotic factor.
    • Plants need moisture.
    • Plants can also become overwatered.
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pH

  • pH is an abiotic factor.
    • Plants are adapted to grow in acidic or alkaline soils.
    • Fish are also adapted to live in waters with specific pHs.
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Gases

  • Carbon dioxide and oxygen are abiotic factors.
    • Plants need carbon dioxide for photosynthesis.
    • Plants and animals need oxygen for respiration.
  • Carbon dioxide-rich environments lack oxygen.
    • Organisms might not be able to survive in carbon dioxide-rich environments.
    • Freshwater species are adapted to survive at certain oxygen levels.
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Biotic factors

  • Biotic factors affect the population of organisms in an ecosystem.
    • Biotic factors are living factors.
  • New predators are a biotic factor.
    • New predators may outcompete existing predators.
  • Disease is a biotic factor.
    • The spread of disease can wipe out a community if it has not built up immunity.
  • Food is a biotic factor.
    • Organisms need nutrients to survive.

Jump to other topics

1Biology

1.1Cells, Tissues & Organs

1.2Reproduction & Variation

1.3Ecological Relationships & Classification

1.4Digestion & Nutrition

1.5Plants & Photosynthesis

1.6Biological Systems & Processes

2Chemistry

2.1Particles

2.2Chemical Reactions

2.3Atoms, Elements, Compounds

2.4The Periodic Table

2.5Materials & the Earth

2.6Reactivity

2.7Energetics

2.8Properties of Materials

3Physics

3.1Energy

3.2Forces & Motion

3.3Waves

3.4Electricity & Magnetism

3.5Matter

3.6Space Physics

4Thinking Scientifically

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