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Populations

Populations. Demography. Demography. Demography is the study of processes that influence population size - it is the way we study changes brought about by births, deaths and dispersal. For Northwest Montana, Greater Yellowstone, Central Idaho. The Fundamental Equation of Ecology – Harper 1977.

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Populations

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  1. Populations

  2. Demography

  3. Demography • Demography is the study of processes that influence population size - it is the way we study changes brought about by births, deaths and dispersal For Northwest Montana, Greater Yellowstone, Central Idaho

  4. The Fundamental Equation of Ecology – Harper 1977 Δ N = B – D + I – E Change in Number = Births – Deaths + Immigration - Emigration John L. Harper – 1925-2009

  5. Rearrange Fundamental Equation Δ N = B – D + I – E Nfuture = Nnow + B – D + I – E Often we assume that I = E, so no net dispersal

  6. Common Field Grasshopper

  7. Grasshopper – development and incomplete metamorphosis

  8. Red Deer – Stag, Hind, Fawn

  9. Isle of Rhum, Scotland

  10. Red deer fawn being tagged for study

  11. Arithmetic scale Logarithmic scale

  12. General types of survivorship curves

  13. Human management of species may change survivorship curves A – fish mortality in typical population B – fish taken by fishing

  14. Population Pyramid For France Jan. 1, 1967

  15. Changes in population of Japan over time

  16. Changes in population of Canada from 1971-2006

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