Lec3EEMB2W08

Lec3EEMB2W08 - Patterns of Population Growth Population =...

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1 Population = Individuals of the same species living in the same geographical area Patterns of Population Growth How do we measure changes in population size and composition? How do we identify the ecological and evolutionary causes of these fluctuations? The populations of species vary over space and time Characteristics of Populations Population attributes (demographic events) concerned with changes in population size are interrelated Density (Pop Size) Immigration (+) Emigration (-) Natality, mortality, immigration and emigration drive population dynamics (the change in population density through time and space) Mortality (-) Natality (+) Characteristics of Populations Density = the number of individuals per unit area or volume Measured by: 1) Total Counts - count all individuals within a population (usually impractical or impossible) 2) Sampling methods - sub sample population to estimate densities and total population size (quadrats, mark and recapture techniques, etc.) 3) Indirect indicators - number of nests, fecal droppings, tracks, etc., as estimates of density Characteristics of Populations 1) Natality (birth rate) = the number of offspring produced per unit time Dependent on type of organism:
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Lec3EEMB2W08 - Patterns of Population Growth Population =...

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