Human population

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Human population

Pop. Control

Increased affluence=increased environmental challenges

India: education of demals access to family planning

China: one child policy

Rule of 70

finding the doubling time of a pop.

doubling time (in years)= 70/growth rate

Survivorship curve (as a function of age)

Type 3: lots of young die (trees)

Type 2: does not really depend on age (birds)

Type 1: live a long time die of old age(human)

Pop. Dynamics

Humans are not unique in their ability to alter their environment. The ability ro alter their environment to increase its carrying capacity, sometimes to the detriment of other species.

Long-term exponential growth carries with it the potential risk of famine, disease, and large-scale death, as well as social consequences of crowding such as increased crime.

Growth Models

Logistic Growth Rate

Exponential Growth Rate

Growth Rate

Age Structure

Sex Ratio

Factors influencing pop.size

density independent factors: fire, floods, climatic events

density dependent factors: food, water, shelter