BIO 2129 Lecture 9: October 5, 2016 - Abundance and Growth
5 Oct 2016
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Document Summary
Population density varies over time and and across spatial gradients. N=f (environmental conditions), environmental factors can include climatic conditions, habitat types, or environmental variability. Population growth n 1 = n t-1 + birth - mortality + immigration - emigration. If the population size of an organism at a recent time was gigantic, it will create a likelihood that the population size at the present moment will be large. Closed population = isolated from surrounding areas (island) We must account for additional effects of immigration and emigration. Species prefer certain types of habitats over others; this is a function of their evolutionary past. Population dynamics also depend on biotic interactions (predators and prey) = geometric rate of increase (used with geometric population growth, known also as discrete. N = population size t = time population growth) r = per capita rate of increase (used with exponential population growth)
