BIO120H1 Lecture Notes - Exponential Growth, Habitat Destruction, Semelparity And Iteroparity
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BIO120H1 Full Course Notes
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25% of amphibians danger of going extinct. Earths pop doubled in less than 50yrs. Pop ecology study of what factors affect pop and why a pop changes overtime. Population ecology: study in growth, regulation, dynamics and demography, explains organism"s life history its growth, development, reproduction and survival. Salmon, bamboos, insects die immediately after reproducing, others reproduce repeatedly. Applies to new establishing enviros, with low initial pop density. Pop growth eventually slows and ceases to increase: logistic growth resources deplete, pop growth rate very slow and stops. Carrying capacity (k) point at which growth stops. Number of individuals of a particular pop that enviro can support pop size become constant (birth rates = death rates), pop growth = 0. Lemmings small rodents (arctic of greenland) experiences rapid fluctuations in pop density: collard lemming limiting factor of pop size was predation pressure (foxes, owls, stoats) density dependant.
