BIO 373 1st Edition Lecture 15 Outline of Last Lecture I Population dynamics continued a Metapopulation continued i Problems ii Relevance II Competition a Resource vs physical factors b Exploitation competition c Interference competition d Asymmetry of competition Outline of Current Lecture I Competition Contd a Regional distribution b Resource portioning c Lotka Voltera Model i Competition graphs ii Outcomes iii coexistance Current Lecture Competition Contd regional distribution o when species were alone distributed everywhere o when with other species only distributed up to a certain elevation this is evidence that competition is present effects the distribution of species competition exclusion principle o those that use a limited resource in the same way can t coexist These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute ex growing a bacteria species alone logistic growth growing two species together one persisted and one went extinct eat the same thing use the same resource resource portioning o distribution of species depending on resources available and how species use the resources Lotka Voltera model o See slides for formulas but do not need to memorize o Competition graphs see slides for images At any point on the line carrying capacity for species 1 is entirely filled with individuals of both species as two species coexist one begins to decrease as the other increases a winning competitor arrows portray dynamics of species at equilibrium there is no change in population density o outcomes of model see graphs on slides N1 over N2 N2 over N1 N2 over N1 reach equilibrium then N1 over N2 N1 over N2 reach equilibrium then N2 over N1 If isocline of one species is above the other that species will win If isocline crosses there is unstable equilibrium here either species can win Also at this point neither reaches their carrying capacity All vectors of possible outcomes are pointing to equilibrium point Coexistence occurs when o If alpha and beta are equal and close to 1 equally strong competitors
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