Option G: Conservation Ecology G2 Ecosystems

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Option G Conservation EcologyG2 Ecosystems
Biomes (pg 328-338)
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Gross productivity - the amount of energy trapped
in organic matter during a specified interval at
a given trophic level.
Interesting Link http//users.rcn.com/jkimball.m
a.ultranet/BiologyPages/N/NetProductivity.htmlNet
_Productivity
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Net productivity gross productivity minus that
lost by the respiration of the organisms at that
level. GP R NP
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• One problem with calculating NP is that some
  animals are omnivores and can affect more then
  one trophic level. Also there is seasonal
  variation, and unknown feeding habits.
• Ex Humans, rats

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• A food web is often used to show these multiple
  interactions.
• Ex A coyote is both a secondary and tertiary
  consumer.

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• 10 of energy is passed from one trophic level to
  the next. This means there is 90 less energy to
  make the next level resulting in fewer members
  and less biomass.
• Pyramid of Energy (units kJ m-2yr-1)

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Ecosystems have a lifecycle that usually ends
with a natural disaster such as a forest fire.
The result is a clear fertile area for plants to
colonize with different abiotic and biotic
factors then the preceding forest.
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Primary succession involves pioneer species
developing and stabilizing the ecosystem. Slowly
they change the abiotic biotic factors of the
ecosystem. Secondary succession involves a
change in the dominant species of the area over
time.
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During primary succession gross productivity
rises as small plants are replaced by larger
plants, productivity increases, biomass
increases, diversity increases, soil is built,
minerals accumulate, erosion is reduced
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A biome is an ecological region dominated by a
certain type of ecosystem characterized by
certain precipitation and temperature conditions
leading to a distinctive biological community
adapted to these conditions. The biosphere
includes all of the earths biomes.
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• Homework outline the characteristics of the
  Earths six major biomes. Include
• Temperature range
• Precipitation range
• 2 examples of plants
• (picture 2 characteristics)
• 1 example of an animal
• Map