Chapter 54 community ecology 1 b iological community

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Unformatted text preview: lar environment can support. Carrying capacity is not fixed but varies over space and time with the abundance of limiting resources. 18. The factor involved in determining (k) is energy limitation. 19. Equation for logistic population growth: dN/dt=rmaxN(K-N)/K 20. When N is a small number compared to K, the term (K-N0/K is large and the per capita rate of increase is close to the intrinsic rate of increase. 21. When N is large and approaches K, resources are limiting. In this case, the term (K-N)/K is small and so is the rate of population growth. 22. Logistic population growth is greatest when the population is approx. half of the carrying capacity. 23. The type of growth curve that is characteristic of a population exhibiting logistic population growth is an S curve. 24. Some populations exhibit deviations from the logistic growth model because 25. K-selection (density-dependent selection)- selection of life history traits that are sensitive to population density; favored by iteroparity. 26. R-selection (density-independent selection)- life history traits that maximize reproductive success in uncrowded environments; favored by semelpority. 27. Density-dependent factors have an increased effect on a population as population density increases. This is negative feedback, which prevents unlimited population. Chapter 54: Community Ecology 1. B iological community - group of populations with different species living close enough to interact I nterspecific interactions - -/- interactions with other species such as parasitism, mutualism, and commensalism T rophic structure - feeding relationships between organisms F ood web - summarizes the trophic relationships 2. Interspecific competition is an -/- interaction; individuals of different species compete for a resource that limits their growth and survival 3. Competitive exclusion is the elimination of an inferior competitor; in the absence of disturbance, one species will use the resource more efficiently and thus reproduce more rapidly than the other 4. Ecological niche is the sum of a species’ use...
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This document was uploaded on 03/02/2014 for the course BIO 109 at University of Missouri-Kansas City .

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