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SC.L.17.5 Analyze factors that affect the size of a population PowerPoint Presentation
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SC.L.17.5 Analyze factors that affect the size of a population

SC.L.17.5 Analyze factors that affect the size of a population

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SC.L.17.5 Analyze factors that affect the size of a population

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  1. Population size is determined by: Births Deaths Immigration Emmigration Limiting Factors biotics and abiotics SC.L.17.5 Analyze factors that affect the size of a population

  2. Use a food web to identify producers, consumers, and decomposers. The more steps in a food chain the less efficient the energy transfer. SC.L17.9: Food Web

  3. Explain the pathway of energy transfer through trophic levels and the reduction of available energy of successive trophic levels. The energy flows from producers to consumers, but some is lost to the environment as heat due to metabolism in each of the lower trophic levels. Energy transfer and reduction of energy

  4. Human activities may be increasingly harmful to ecosystems. However unlike other organisms, humans can recognize their impact on natural systems and change their behavior to minimize those effects Use of resources (renewable and nonrenewable) Deforestation reduces biodiversity and increases erosion. The removal of a forest will increase runoff on a river and it may overflow Greenhouse effect (the burning of fossil fuels increases the levels of CO2) Pollution (air, water, soil) The excess use of fertilizers (nutrients) cause algal blooms in bodies of water. This is known as eutrophication. Eventually fish and other aquatic organisms will die due to the lack of oxygen, because bacteria use oxygen when decomposing algae. SC.L17.20 Impact of individuals on environmental systems