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California Science Standards Biology

California Science Standards Biology. ECOLOGY. 6. Stability in an ecosystem is a balance between competing effects . . ECOLOGY: Biodiversity. Biodiversity is the sum total of different kinds of organisms. is affected by alterations of habitats. . b. Changes in Ecosystem. result from

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California Science Standards Biology

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  1. California Science Standards Biology

  2. ECOLOGY 6. Stability in an ecosystem is a balance between competing effects.

  3. ECOLOGY: Biodiversity Biodiversity • is the sum total of different kinds of organisms. • is affected by alterations of habitats.

  4. b. Changes in Ecosystem result from • changes in climate • human activity • introduction of nonnative species • changes in population size.

  5. c. population size is determined by • Birth (natality) rate • Death (mortality) rate • Immigration • Emigration

  6. ECOLOGYd. Biogeochemical Cycles: carbon • NOTICE: relationship between abiotic resources (like sunlight) and organic matter

  7. d. Biogeochemical cycles: Water • NOTICE: relationship between abiotic resources (like sunlight) and the environment

  8. ECOLOGYd. Biogeochemical cycles: Nitrogen • NOTICE: relationship between abiotic resources (like nitrogen) and organic matter (like bacteria)

  9. e. ecosystem stability depends on producers and decomposers. Producers • AutotrophsUse energy directly from environment • Make own food • Bottom of the food chain • First trophic level Decomposers • Heterotrophs • Break down organic matter to get energy • FBI(fungi, bacteria, insects)

  10. ECOLOGY:Producers: make own food

  11. ECOLOGY: Decomposers

  12. ECOLOGY: Consumers: Heterotrophs Can be carnivores(eat other organisms) Can be herbivores(eat producers)

  13. CONSUMERS-

  14. ECOLOGYENERGY f. energy is stored but much energy is dissipated into the environment as heat.

  15. ECOLOGY:Energy is passed through food Food chains show one energy path

  16. ECOLOGY: f. food web • describes predator-prey relationships within a community; • groups of interconnected food chains • Arrows indicate direction of energy (and nutrition) flow

  17. ECOLOGY f. energy pyramid. Energy levels are called TROPHIC levels This energy pyramid has 3 trophic levels

  18. EVOLUTION • 8. Evolution is the result of genetic changes that occur in constantly changing environments. As a basis for understanding this concept:

  19. EVOLUTION • a. Students know how natural selection determines the differential survival of groups of organisms.

  20. EVOLUTION • b. Students know a great diversity of species increases the chance that at least some organisms survive major changes in the environment.

  21. EVOLUTION • e. Students know how to analyze fossil evidence with regard to biological diversity, episodic speciation, and mass extinction.

  22. Credits • Slides with burgandy background are taken from http://www.sci.csuhayward.edu/best/Summer01/CalEcology

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