-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
convert LDC to MDC through industrialization/modernization