10-15-09 - Biology 330 Class Notes 10/15/09 Intraspecific...

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Biology 330 – Class Notes – 10/15/09 Intraspecific competition – the negative effect on population density that one population of the same species has on another population of the same species Interspecific competition – the negative effect on population density that one population of one species has on another population of a different species If K2/alpha is greater than K1 and K1/alpha is greater than K2, than K1 will win Triboleum confusum - T. castaneum - If we mix these two species of beattles with flowers, one of the two species will outcompete the other at varying levels of relative humidity and temperature. 24oC 29oc 34oC 70% Relative humidity Triboleum confusum T. castaneium T. castaneum 30% R.H Confusum Confusum confusum Outcome depends on temperature and relative humidity Warm and humid environments T. castaneum Cool and dry One species will win depending on the temperature and relative humidity Habitat heterogeneity promotes biological success of both competing organisms because there are patches in the environment that have different conditions both will survive Clumped distributions –why do we have clumped distributions of populations? Because some patches of environment are better than others
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What would allow competing species to coexist? 1. Habitat heterogeneity * Different habitats are more favorable to one competitor and other patches of the environment are more favorable to the other competitor 2. Small populations a. KEYSTONE PREDATOR : Invoke a mechanism that will hold both populations at low levels both populations are held low enough that the ration is sufficient for both populations because they are not consuming too many resources b. Predator A predator might target the population of prey that is more abundant a predator that preys on the dominant competitor (larger population) EXAMPLE: * Literature was put out by Robert Paine (1966) * The resource that is most severely limiting is substrate in the presence of a high/low tide intertidal zone is where many organism fixate themselves
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10-15-09 - Biology 330 Class Notes 10/15/09 Intraspecific...

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