Lecture 13, 14 Population Ecology Population Ecology1.018J 1.018J2009 2009The next three lecturesThe next three lecturesGrowth under unlimited conditionsGrowth under unlimited conditionsResource limited growthResource limited growthAge- structured populationsAge- structured populations ––““life tableslife tables””Human Population GrowthHuman Population GrowthHow do you measure the size of a population?QUADRATSUNIFORM DISTRIBUTIONRANDOM DISTRIBUTIONCLUMPSquadrat size has to be very large for clumpeddistrubutionsMark and recapture method Mark and recapture methodQuestion: what is the population size, N? Step 1: Capture and mark M individualsStep 2: Release and wait Capture S individuals in second sampling Step 3: and count # that are marked (R)So…. N (number in population) = S x M/R i.e. originally markedN = number in second sampling X recovered markedSo how do we model population growth?OrganismOrganism -1) DoublingDoubling TimeTimeBacteria 58.7 17 minBeetle 0.101 6.9 daysRat 0.0148 46.8 daysCow 0.001 1.9 yearsBirch Tree 0.00075 25 yearsGrowth Rate Examplesr (dayMIT OpenCourseWare http://ocw.mit.edu 1.018J / 7.30J Ecology I: The Earth Fall 2009 For information about citing these materials or our Terms of Use, visit:
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