KEY CONCEPT Organisms interact as individuals and as populations.

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KEY CONCEPT Organisms interact as individuals
and as populations.
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Competition and predation are two important ways
inwhich organisms interact.

• Competition occurs when two organisms fight for
  thesame limited resource.
• Food
• Water
• Shelter
• Mates
• How does cooperation
• and competition among
• organisms differ from
• human cooperation and
• competition?

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Interspecific competition

• Occurs between two different species, even though
  they have different niches

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Intraspecific Competition

• Occurs between members of the same species.

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• Predation occurs when one organism captures and
  eats another.

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Predation
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Symbiosis - A close relationship between 2 or
more organisms of different species living
together
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• There are three major types of symbiotic
  relationships.

1. Mutualism both organisms benefit

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Lesser long nosed bat

• Bat pollinates cactus in spring as they feed on
  nectar
• In summer eat fruit and spread indigestible seeds
  when they pooh!

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Can you think of other mutualism examples
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• There are three major types of symbiotic
  relationships.

2. Commensalism one organism benefits, the
other is unharmed
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Commensalism
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• There are three major types of symbiotic
  relationships.

• 3. Parasitism one organism benefits, the other
  is harmed

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• There are three major types of symbiotic
  relationships.

• 3. Parasitism meet their needs as ectoparasites
  (such as leeches) and endopaasites (such as
  hookworms)

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Worst parasites

• Parasites

Pinworms Yikes!