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Bell Ringer

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Bell Ringer What types of community interactions among organisms help shape ecosystems? What shapes an ecosystem? The Niche Food organism eats Physical conditions ... – PowerPoint PPT presentation

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Title: Bell Ringer


1
Bell Ringer
  • What types of community interactions among
    organisms help shape ecosystems?

2
4.2
  • What shapes an ecosystem?

3
The Niche
  • Food organism eats
  • Physical conditions needed for survival
  • When where it reproduces
  • No two species can share the same niche in the
    same habitat but different species can have
    similar niches

4
  • Competitive exclusion principle- no two species
    can occupy the same niche/same place/same time

5
Barnacles
6
(No Transcript)
7
(No Transcript)
8
Community interactions
  • 1. Competition
  • 2. Predation
  • 3. Symbiosis
  • Mutualism
  • Commensalism
  • Parasitism

9
Community interactions
  • Competition
  • when organisms compete for the same resources
  • Competition activity
  • Need two volunteers
  • Colored marshmallows

10
Community Interactions
  • 2. Predation
  • one organism captures feeds on another

11
Community interactions
  • 3. Symbiosis---two different species live
    together
  • Mutualism- both species benefit
  • Commensalism- one benefits without harming the
    other
  • Parasitism- one lives on another while causing
    harm

12
mutualism
13
commensalism
14
Parasitism
15
Ecological Succession
  • Ecosystems are constantly changing in response to
    natural human disturbances
  • 2 types
  • Primary
  • occurs on surfaces where no soil exists
    (volcanic activity)
  • Secondary
  • ecosystem restores to original condition after
    disturbance is over (fires, farming, etc.)

16
Primary succession
17
Secondary succession
18
The new island of Anak Krakatau
  • http//videos.howstuffworks.com/hsw/8276-islands-
    and-evolution-the-new-island-of-anak-krakatau-vide
    o.htm
  • http//videos.howstuffworks.com/discovery/29496-a
    ssignment-discovery-succession-in-the-environment-
    video.htm

19
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