Standard 6c Preknowledge
6c) Students know how fluctuations in population size in an ecosystem are determined by the relative rates of birth, immigration, emigration, and death.
CALIFORNIA FRAMEWORKS SUMMARY:
Fluctuations in the size of a population are often difficult to measure directly but may be estimated by measuring the relative rates of birth, death, immigration, and emigration in a population. The number of deaths and emigrations over time will decrease a population’s size, and the number of births and immigrations over time will increase it. Comparing rates for death and emigration with those for birth and immigration will determine whether the population shows a net growth or a decline over time.