ZOOLOGY 651 Lecture Notes - Lecture 17: Poa Annua, Fecundity, Thomas Robert Malthus
13 Nov 2016
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Thomas malthus: the human population grew to 1 billion around the year: 1804: the current rate of population growth in the human population is about: 1: in a population growing exponentially, the growth rate is proportional to: Both population size and r: the graph demonstrates: a density dependent effect, the graph here reflects: an allee effect. Why study age/size structure to get more realistic predictions of population growth and recovery. Age structure environment factors can alter survival or fecundity and thus change population growth rates. Knowledge of these factors helps develop management practices to decrease pest populations or increase an endangered population example: Deterministic conditions stay constant no environmental change. Birth and death rates depend only on age or size. Tg = lx bx x / lx bx r est ~ ln (ro) / tg good initial estimate. Nx = n0 lx l-x proportional to ix in stationary population bottom heavy in growing population top heavy in declining population.
