BIO120H1 Chapter Notes - Chapter 11: Intraspecific Competition, Galium, Limiting Factor
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BIO120H1 Full Course Notes
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Intraspecific competition can cause density dependent reductions in popn size. In competition: synedra drove asterionella to extinction, low levels of sio2, asterionella couldn"t survive. Competition can increase in intensity when resources are scarce: below ground and above ground competition for resources, ex. nutrients in soil, light. Competition for resources is common in natural communities (slides) Species compete directly or indirectly: exploitation competition: species compete indirectly through their mutual effects on the availability of a shared resource. Ind"s reduce the supply of a resource as they use it. Interference competition: occurs when species compete directly for access to a resource that both require, such as food or space. Antagonistic actions that directly interferes with the ability of their competitors to use a limiting resource. Also take the form of allelopathy: in which ind"s of one species release toxins that harm ind"s of other species.
