00 - Ecosystems in Action.pdf - Ecosystems in Action ecosystems are dynamic o interactions between biotic and abiotic factors results in changes to an

00 - Ecosystems in Action.pdf - Ecosystems in Action...

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Ecosystems in Action ecosystems are dynamic o interactions between biotic and abiotic factors results in changes to an ecosystem o seasons change o organisms live, reproduce, and die o populations increase and decrease Population Growth the number and variety of species can change for many reasons o births and deaths o immigration (moving into an area) o emigration (moving out of an area) o availability of food o presence of predators if the birth rate is higher than the death rate population increases if the birth rate is lower than the death rate population decreases population growth is determined by: o natality = births (b) o mortality = deaths (d) o immigration (i) o emigration (e) population growth = (entering the population) (leaving the population) = (those being born + those immigrating into) (those dying + those emigrating from) = (b + i) (d + e) population growth rate = (b + i) (d + e) initial population when no controls are present (no predators, unlimited food), populations grow quickly Human population
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  • Summer '20
  • Demography, World population, populations increase

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