BIO 373 1st Edition Lecture 15 Outline of Last Lecture I. Population dynamics continueda. Metapopulation continuedi. Problemsii. RelevanceII. Competitiona. Resource vs. physical factorsb. Exploitation competitionc. Interference competitiond. Asymmetry of competitionOutline of Current Lecture I. Competition Contda. Regional distributionb. Resource portioningc. Lotka-Voltera Modeli. Competition graphsii. Outcomesiii. coexistanceCurrent LectureCompetition Contd- regional distributiono when species were alone, distributed everywhereo 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 principleo those that use a limited resource in the same way can’t coexistThese 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 portioningo distribution of species depending on resources available and how species use theresources- Lotka-Voltera modelo See slides for formulas, but do not need to memorizeo 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 densityo 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 wheno If alpha and beta are equal and close to 1, equally strong
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