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Bio171-F08-Lec%208 - Biology 171 Lecture 8 Friday Todays...

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Lecture 8: Friday September 19, 2008 Biology 171 Today’s Topic: Community Ecology: Species Interactions: Competition Announcements Community Ecology Species Interactions: Competition Fitness & Ecological Niches Competitive Exclusion Connell’s Barnacle Field Study Niche Differentiation Text Reading: Lecture 8: 2 nd ed: Chapter 53 (1214-1220) 3 rd ed: Chapter 53 (1196-1202) Lecture 9: 2 nd ed: Chapter 53 (1220-1225); Chapter 39 (904-907) 3 rd ed: Chapter 53 (1202-1205); Chapter 39 (882-888) This Week’s Discussion: Global Warming
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Recommended Aim: global CO 2 emissions will need to be reduced to the level of the ocean sink ( i.e. to about 25% of their current global level) over the next century or so. Achieving this will be extraordinarily challenging….. What Can We Do About This?
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Levels of Organization Individual organism Population Community Ecosystem Biosphere A biological community consists of the species that interact with one another within a particular area. Community ecologists study the nature and consequences of the interactions among species in a community.
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Interactions among species have 2 main outcomes: (1)they affect the distribution and abundance of the interacting species. (2) they are agents of natural selection and thus affect the evolution of the interacting species. Because the species in a community interact almost constantly, the fate of a particular population may be tightly linked to the other species that share its habitat.
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Competition is a – /– interaction that occurs when individuals use the same limited resources .
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Many types of competition exist and, in the public consciousness,
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