GenBio_5_PopEcol

GenBio_5_PopEcol - Population Ecology Dispersion Changes in...

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Population Ecology 1 • Dispersion • Changes in Population Size: Population Models • Population Regulating Mechanisms • Reproductive Strategies Î r & K selection • Survivorship Curves ECOLOGY - Recommended Reading Population Ecology Chap. 51 Community Ecology Chap. 52 a) Clumped (patchy) b) Uniform c) Random Dispersion e.g. behavioral patterns often lead to clumping often lead to clumping
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Population Ecology 2 All organisms produce more offspring than can possibly survive to reproduce CHANGES IN POPULATION SIZE One pair IF all offspring survived, in 7 generations the population would number: 5,598,720,000,000 Populations possess enormous potential for growth 100 pair IF all offspring survived, in 15 generations the population would number: 10 79
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Population Ecology 3 Two opposing forces in population growth: • Natality (b) • Mortality (d) Growth rate or the intrinsic rate of increase (r) : r = b – d Δ N/ Δ t = b – d dN/dt = rN POPULATION MODELS dN/dt = rN Modeling EXPONENTIAL Growth N = # of individuals in population r = intrinsic rate of growth t = time d = Δ or change Malthus ‘J’ curve Population Models Malthus Exponential growth in a bacterial population dN/dt = rN Population Models 1. Growth 2. Stability 3. Decline
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