1/15/20091Introduction to Environmental Science:5. Factors Controlling the Distributionand Abundance of OrganismsEarth 122Prof. Walter A. IllmanFactors Controlling the Distribution andAbundance of OrganismsNothing succeeds like excess.Oscar Wilde’s definition of natural selection
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1/15/20092Objectives•Describe how environmental factors influencewhich species live in a given ecosystem andwhere or how they live.•Understand how random genetic variation andnatural selection lead to evolution, adaptation,niche specialization, and partitioning of resourcesin biological communities.•Compare and contrast interspecific predation,competition, symbiosis, commensalism,mutualism, and coevolution.Objectives•Discuss productivity, diversity, complexity, andstructure of biological communities and howthese characteristics might be connected toresilience and stability.•Explain how ecological succession is changedthrough time in an ecosystem and the biologicalcommunities that occupy it.•Give some examples of exotic species introducedinto biological communities and describe theeffects such introductions can have on indigenousspecies.