Symbiosis Powerpoint

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					Ecology Notes 4-2
 Community Interactions
           Biotic vs. Abiotic
 Biotic factors – living factors in an
  environment. Ex. Trees, birds, bacteria,
  etc.
 Abiotic factors – non living factors in an
  environment. Ex. Temp., rainfall,
  humidity, soil.
                     Niche
   Niche – full range of conditions in which
    an organism lives (biotic and abiotic). It is
    like your “occupation”.
               Competition
 Competition – occurs when
  organisms attempt to use a
  resource (water, nutrients,
  light, food or space) at the
  same time.
 We call this a +/- relationship.
 Competitive Exclusion
  Principle – no two organisms
  can occupy exactly the same
  niche in the same habitat at
  the same time.
                    Predation
   One organism
    captures and feeds
    on another organism.



   This is a +/-
    relationship.
   Symbiosis – any relationship
    where two organisms live
    closely together.
   3 types of Symbiosis
    1. Mutualism +/+ both
    organisms benefit. Ex.
    Flowers/insects.
   2. Commensalism +/0 one organism
    benefits and the other is neither helped
    nor harmed. Ex. Whales/barnacles
   3. Parasitism +/- One organism lives
    on or in another organism. Ex. Dog/flea

				
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posted:10/16/2011
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