pops 2 f08 students

pops 2 f08 students - How does population size change over...

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Unformatted text preview: How does population size change over time?-- Start with a very small population and describe growth over time 2 idealized modes of growth:- Exponential- Logistic Population Biology II Population Growth Models Human Population Dynamics Exponential growth model - See Brooker, Figs. 56.8, 56.9, 56.10; Campbell, Figs. 53.10, 53.11 Time Number of bacterial cells G = rN G = Growth rate N = # of individuals r is small if: High death rate Low birth rate What is r? Individuals not ______________ Sex ratio skewed toward ________ ________generation time r varies between populations These two populations have a different r Different rates of exponential growth Brooker, Fig. 56.8 See also Campbell, Fig. 53.10 EXPONENTIAL GROWTH MODEL (Recap): G=rN Rate of increase (r) and N determine speed at which population size increases Population-limiting factors Controls on population size Density-dependent controls Depends on population density From Biology, Freeman, et al. 2008. See also Campbell, Fig. 53.16 Higher density changes in survivorship & fecundity WHY? If interested in more info, see Time To Raise The Devil on website and/or http://www.dpiw.tas.gov.au/inter.nsf/WebPages/LBUN-5QF86G?openIf interested in more info, see Time To Raise The Devil on website and/or http://www....
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pops 2 f08 students - How does population size change over...

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