LIFESCI 1 Lecture Notes - Lecture 9: Logistic Function, Intraspecific Competition, Exponential Growth
Document Summary
Ecology: the study of how organisms interact with each other and with their physical environment. Ecological interactions on short time scales shape the evolutions of traits over long time scales. Evolution of traits determines how organisms interact with their biotic and abiotic environment. Organism population community ecosystem biome biosphere. Studies the size, range, and density of a population and how they change over time. Ecological interactions determine distribution and abundance of organisms. All individuals of a given species that live and reproduce in in a particular place. Change of n = (b-d) + (i-e) Demography: study of the size, structure, and distribution of populations over time. Exponential growth: when per capita growth rate (r) remains constant, overall growth increases with population size. Carrying capacity (k): maximum number of individuals a habitat can support. As n approaches kresources become limited, intraspecific competition increases. Natural populations tend to fit the logistic growth model, producing an s-curve of population growth over time.
