BISC 204 Lecture Notes - Lecture 5: Whooping Crane, Life Table, Ecological Footprint
5 Oct 2017
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Document Summary
Group of regularly interbreeding individuals of a species. Location-based, somewhat arbitrary distinctions between populations: spatial and temporal arrangement, distribution: spatial extent of organisms within a species, determined by historical, physical, and biological filters . Will discuss biological examples in great detail in later lectures: can classify spatial arrangement (dispersion) along a gradient from, clumped, predatory avoidance, patchy resources, random, most common form. Stochasticity, disturbance, predators/herbivores, patchy resources: uniform (evenly spaced, territoriality, strict competition for resources, abundance: number of individuals in a population. Dynamic, changes through time (balance of births, deaths, emigration, immigration) Often expressed as density = # individuals/area: population dynamics, on average every individual produces one successful offspring-- replacement rate results in steady state population, births (natality) = deaths , balance of births deaths and immigration emigration. Before we talked about how the stability of populations must mean that on average each individual is only replacing itself through reproduction.
