Populations and Growth

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Presentation transcript:

Populations and Growth

Population Dispersion

Survivorship Curves Type I Few offspring Low infant mortality Parental care of young Most survive until old age Large mammals, including humans

Survivorship Curves Type II Equal chance of living or dying throughout the lifetime Birds, reptiles, small mammals

Survivorship Curves Type III High infant mortality rate Many offspring No parental care Invertebrates, fish, amphibians, and plants

Changes in Population Size Growth factors Immigration: individuals moving into a population Births Shrinking factors Emigration: individuals moving out of a population Deaths

Exponential Growth Early phase of growth High availability of resources Little competition Little predation

Logistic Growth Limits on growth appear Competition for resources Predation Parasitism Illness

Human Population Growth Are humans in exponential or logistic growth?

U.S. Population Density - 2000 People per square mile 0-1 (white) 10-24 (green) 100-249 (blue) 1-4 (yellow) 25-49 (teal) 250-66,995 (dark blue) 5-9 (yellow-green) 50-99 (dark teal)