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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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ecology
ECOLOGY

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

ecology biodiversity
ECOLOGY: Biodiversity

Biodiversity

  • is the sum total of different kinds of organisms.
  • is affected by alterations of habitats.
b changes in ecosystem
b. Changes in Ecosystem

result from

  • changes in climate
  • human activity
  • introduction of nonnative species
  • changes in population size.
c population size
c. population size

is determined by

  • Birth (natality) rate
  • Death (mortality) rate
  • Immigration
  • Emigration
ecology d biogeochemical cycles carbon
ECOLOGYd. Biogeochemical Cycles: carbon
  • NOTICE: relationship between abiotic resources (like sunlight) and organic matter
d biogeochemical cycles water
d. Biogeochemical cycles: Water
  • NOTICE: relationship between abiotic resources (like sunlight) and the environment
ecology d biogeochemical cycles nitrogen
ECOLOGYd. Biogeochemical cycles: Nitrogen
  • NOTICE: relationship between abiotic resources (like nitrogen) and organic matter (like bacteria)
e ecosystem stability depends on producers and decomposers
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)
slide12

ECOLOGY: Consumers: Heterotrophs

Can be carnivores(eat other organisms)

Can be herbivores(eat producers)

ecology energy
ECOLOGYENERGY

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

slide15

ECOLOGY:Energy is passed through food

Food chains show one energy path

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

Energy levels are called TROPHIC levels

This energy pyramid has 3 trophic levels

evolution
EVOLUTION
  • 8. Evolution is the result of genetic changes that occur in constantly changing environments. As a basis for understanding this concept:
evolution1
EVOLUTION
  • a. Students know how natural selection determines the differential survival of groups of organisms.
evolution2
EVOLUTION
  • b. Students know a great diversity of species increases the chance that at least some organisms survive major changes in the environment.
evolution3
EVOLUTION
  • e. Students know how to analyze fossil evidence with regard to biological diversity, episodic speciation, and mass extinction.
credits
Credits
  • Slides with burgandy background are taken from http://www.sci.csuhayward.edu/best/Summer01/CalEcology
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