Lect. 15 competition web

Lect. 15 competition web - Competition = interactions that...

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1 Competition = interactions that lower fitness of both individuals Resources are in short supply The world IS finite… How are resources divided? Between species and individuals How do multiple species coexist? What happens when niches overlap?
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2 Modes of Competition What about this? Interference AND Intraspecific Interference : Direct aggressive interactions. Resource : Competition for limited resources. Intraspecific : Competition with members of own species. Interspecific : Competition between two species - reduces fitness of both.
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3 Intraspecific Competition Among Plants Plant populations get smaller as plants get bigger Intense resource competition at higher densities = death for some (i.e. Self Thinning ). -3/2 Self-Thinning Rule – most plants are quite similar! Average weight of individuals declines with density @ -3/2 rate
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4 Similar things happen among animals (not quite as consistent as plants) Denno and Roderick - resource competition among hoppers (higher mortality at higher densities) Grosholz recorded interference competition among sow bugs (they ate each other!)
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5 Interspecific competition Gause : Principle of Competitive Exclusion Two species with
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Lect. 15 competition web - Competition = interactions that...

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