Species Area Curves

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Species Area Curves

• Species area curve predicts that larger islands
  will have more species than smaller islands.
• ScAz where
• S number of species
• c a constant measuring the number of species
  per unit area
• A area of island (in square units)
• z a constant measuring the slope of the line
  relating to S and A

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(No Transcript)
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Island Biogeography

• Number of species (on a plot or island) is a
  balance between immigration and extinction.
• If immigration exceeds extinction, then the
  number of species will increase.
• Number of species usually at equilibrium

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Island Biogeography

• Immigration rates on islands are related to the
  distance from the mainland.
• Close islands have greater immigration rates than
  far islands
• Extinction rates on islands are related to the
  size of the island.
• Extinction rates are greater for small islands
  than for large islands

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Island Biogeography
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Bryozoan
Aquatic Colonial Animals. Mostly marine, but some
freshwater. Reproduce by budding Corals are also
colonial animals.
Individual animals are called zooids. Colony is
situated in a gelatinous mass that is firm, but
99 water.
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http//www.civgeo.rmit.edu.au/bryozoa/default.html
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Zooid Anatomy