BIOL 142 Chapter 55 study guide

BIOL 142 Chapter 55 study guide - -survivorship-immigration...

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BIOL 142 Study Guide. Chapter 55 . Population Ecology Ecology: study of how organisms interact with each other and their environments, includes physiological, morphological, and behavioral adaptations to survive in particular habitats Population range - where species are found (depends on match of environmental conditions and adaptations); may shift as the environment changes Population spacing patterns : random, uniform, clumped, or patchy in metapopulations Demography = quantitative study of populations and how they change over time. Factors to measure/consider include: - population growth (influenced by sex ratio, generation time/ life span trade- off, etc.) – N = population size, r = rate of increase - age structure - fecundity - b = birth rate - mortality - d = death rate
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Unformatted text preview: -survivorship-immigration ( i ), emigration ( e )- population growth in populations with no growth limits is exponential, described by the equation: r = (b-d) + (i-e). Populations grow this way when resources are abundant and the cost of reproduction is low, called r-selected populations.- one major limit to population growth is carrying capacity (k) – the maximum number of individuals that can be supported by the environment. Populations show k-selected growth when resources are limited and/or reproductive cost is high. * historically the pattern of population growth for humans has been exponential (r-selected) although the rate of growth has recently started to decline. Is there a k for the human population?...
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