Population Regulation

density independent factors
-Affect population size
->influence is not proportional to N
-abiotic factors such as volcanic eruptions, earthquakes, floods, ice storms, hurricanes
density dependent factors
-Regulate population size
->influence is proportional to N
-resources such as food shortages, nesting sites, space in the intertidal
-also competition, predation, parasitism
-if you increase N you increase severity (and vice versa)
Zero Population Growth (ZPG)
-no net increase
– ?=1 and r=0
ie. China tried traditional proposition of 1 child policy
-but it was coersive, skewed sex ration, aborted or adoption of baby girls, and 4-2-1 syndrome
Another option for slowing population growth?
yes. raise the age at first reproduction
how? – improve living conditions, increase employment, increase education
demographic transition
convert LDC to MDC through industrialization/modernization