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220_Lecture_Competition

220_Lecture_Competition - Competition LAND/SOCR 220 Key...

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Competition LAND/SOCR 220
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Key ideas • Competition: use or defense of a resource by one individual that reduces the availability of that resource to other individuals I t ifi titi th Intraspecific competition: among the same species Interspecific competition: between different species Superior competitors survive at lower resource levels Read Tansley study on pp. 364-365
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Figure 19 2 Figure 19.2
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Names to Know: David Tilman The Book: Resource Competition and Community Structure organizes modern ideas of competition Tilman defines resource : – something that can be consumed and have its amount be reduced – consumers use resources for maintenance & growth – when its availability is reduced, biological processes are affected reducing population processes are affected, reducing population growth
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Types of Resources • Non-renewable: not regenerated (e.g. space) • Renewable: constantly regenerated or replenished From external sources (e.g. sunlight) Di I l i ( ) Direct Internal regeneration (e.g. prey) Indirect Internal regeneration (e.g. nutrients that are released during decomposition but not directly taken up by the organism) least important for lab competition studies, likely very important in nature Limiting Resource (Liebig’s Law of the Minimum) the resource that restricts growth. Sometimes there is co limitation by multiple Sometimes there is co-limitation by multiple resources.
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Competitive Exclusion Competitive Exclusion Principle: two species cannot coexist indefinitely on the same limiting resource the same limiting resource.
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