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Understanding Biodiversity and Human Impact on the Environment

Explore the diversity of life forms in ecosystems and the significance of genetic variation. Learn about human-induced pollution and biomagnification, affecting both species and ecosystems.

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Understanding Biodiversity and Human Impact on the Environment

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  1. Humans and the Environment 22.1 BioDiversity

  2. BioDiversity • The Variety of forms of life in an area. • Measured by Species Diversity • Species richness refers to the number of unique species within an area • Species evenness refers to the relative number of individuals of each species in an area. (often more important to the survival of a species in a changing environment) • Measured by Genetic Diversity • Amount of genetic variation for all members in the population

  3. Human Influence • Pollution – putting substances that cause unintended harm into the air, water, or soil. • Many human activities disrupt ecosystems • Possible effects: • Smog, acid precipitation, ozone thinning, global warming, land and water pollution

  4. Biomagnification • Caused by the pollution by humans of land and water by disposing of waste (sewage and unused materials / chemicals released from factories) • Chemicals often are toxic and can cause cancer • Some chemicals are not directly harmful, but do cause damage to ecosystems

  5. Biomagnification (cont) • Occurs when chemicals enter the ecosystem and become more concentrated in an organism that is higher on the food chain.

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