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Chapter 27-Community interactions

Chapter 27-Community interactions - Chapter 27 Community...

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Click to edit Master subtitle style Chapter 27: Community Interactions http://www.msnbc.msn.com/id/38238685/ns /
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Niche The role or job that the organism has. The organisms way of life. No two niches are alike! - Although some may be very similar.
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How do you know what an animals niche is? You will need to follow it around to see what … The animal eats How the animal protects itself. How it interacts with other organisms. What abiotic factors it needs to survive.
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What is your niche? Write it down in your notes.
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Competition Competition- interaction between organisms for resources. Usually harms both species. resource – something necessary for the organism to survive examples: water, nutrients, light, food, space How do organisms compete? .
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How does Competition Affect a Community? 1. Interspecific comp . - 2 different species Ex: A squirrel and chipmunk competing for acorns. 2. Intraspecific comp . - 2 same species Ex: 2 polar bears competing for a seal
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Competitive Exclusion Principle The competitive exclusion principle : If two species with the same niche are placed together, one would outcompete the other The less adapted species would die out
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Example: Parmecium ( P. aurelia) VS. Parmecium ( P. caudatum) Grown in separate flasks, both survive , exhibiting a s-shaped curve Grown in the same flask, one survives and the other dies off
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How do different organisms deal with having similar niches? Organisms with similar (but not identical) niches show resource partitioning Each organism will occupy a smaller niche than either would alone Example : Some different species of warblers (type of bird) occupy different parts of tree. Reduces the harmful effects of interspecific competition
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5 Major Types of Species Interactions 1. Predation 2. Competition 3. Parasitism 4. Mutualism 5. Commensalism
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Predation One organism catches and consumes another organism Predator = organism that does the killing and consuming Prey = organism that is consumed
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Predation Can be… active – predator hunting its prey or passive – predator draws prey to itself
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