BIO120H1 Lecture Notes - Lecture 5: Fecundity, Semelparity And Iteroparity, Strangler Fig
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Aspen: one seed produces many identical, connected stems. Larkspur: many unique seeds; produce many unique plants. Dandelion: no sex; many identical seeds produce many identical, unconnected plants. Hemi-epiphyte: plants that start life as an epiphyte, seed grows but as it gets bigger the roots descend to the ground. Strangler fig: multiple different seedlings fuse together to make on tree with several genotypes. Continuous versus discrete generations (= differential equations vs. difference equations) Project the trajectory of population growth through time; i. e. , n as a function of t. Time advances one step t t + 1. When using differential equations, time steps are infinitesimally small: use concept of limits and calculus; growth is smooth; best suited for species with continuous reproduction. When using difference equations, time steps are discrete units (days, years, etc): use iterated recursion equations; growth is stepwise. Treat birth and death as per-capita rates that are fixed constants.