Biology 2485B Lecture Notes - Lecture 2: Population Ecology, Natural Selection, Exponential Growth
17 Jan 2018
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Age and sex differences between canada and afghanistan. 3 fundamental types of survivorship curves: type 1 survivorship curve displaying species with higher death rates of older ages, ex. There is a rapid die-off among young offspring: ex. toads and many invertebrates. Populations may grow, shrink or remain stable: population dynamics: how the absolute population size changes over time. Estimated northwest atlantic harp seal population size going back to the late 1700"s (department of fisheries and oceans) Population growth, or decline, is determined by 4 factors: natality: births within the population, mortality: deaths within the population, immigrations: the arrival of individuals from outside the population, emigration: the departure of individuals from the population. We use natural rate of population growth if we are not interested in the effects of migration: The natural rate of population growth reflects the degree to which a population is growing or shrinking as a result of its own internal factors.
