BIOLOGY 171 Lecture Notes - Lecture 14: Logistic Function, Carrying Capacity, Population Ecology

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Ecology: the study of how organisms interact with one another and with their physical environment: many ecologists work on applied problems. Examples: invasive species, infectious diseases, sheries, the effects of pollutants on populations and communities, global climate change, etc. Why does population ecology matter: sometimes we want to prevent population growth, plasmodium parasite that causes malaria, sometimes we want to promote population growth. Only 4 things can change population size: vital rates affect population growth: birth (# births)/ time = b, immigration (# immigrants)/ time = i, death (# deaths)/ time = d, emigration (# emigrants)/ time = e. N1= n0 + b d + i e. B = number of births between times 0 and 1. D = number of deaths between times 0 and 1. I = number of immigrants arriving between times 0 and 1. E = number of emigrants leaving between times 0 and 1.

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