Download
population ecology n.
Skip this Video
Loading SlideShow in 5 Seconds..
Population Ecology PowerPoint Presentation
Download Presentation
Population Ecology

Population Ecology

192 Views Download Presentation
Download Presentation

Population Ecology

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Population Ecology CHAPTER 9 NOTES APES Ms. Miller

  2. Key Concepts • Factors affecting population size • Species reproductive patterns • Species survivorship patterns • Conservation biology and human impacts on ecosystems

  3. Population Dynamics and Carrying Capacity • Population dynamics—study of how populations change in size, density, and age distribution • Biotic potential--a populations capacity for growth(intrinsic rate of increase [r])—rate of growth withunlimited resources • Environmental resistance—all factors that limit the growth of a population • Carrying capacity (K)—maximum number of individuals of a given species that can be sustained indefinitely in a given area • Exponential and Logistic Growth—two models of growth (J curve vs. S curve) • Population Density—number of individuals in a given area

  4. J-Curve

  5. S Curve

  6. Exponential and Logistic Growth

  7. Population Dispersion Fig. 9-2 p. 164

  8. Factors Affecting Population Size Fig. 9-3 p. 166

  9. Population Density Effects • Density-independent controls—affect a population’s size regardless of its density (climate, fire, natural disasters, meteor impacts, unseasonable weather, deforestation, etc) • Density-dependent controls—affect population size/growth as plate job population density increases (competition, predation, parasitism, disease transmission)

  10. Natural Population Curves Fig. 9-7 p. 168

  11. The Role of Predation in Controlling Population Size • Predator-prey cycles • Top-down control vs. Bottom-up control Fig. 9-8 p. 168

  12. Reproductive Patterns and Survival • r-selected species • Asexual reproduction • K-selected species • Sexual reproduction Fig. 9-10 p. 170

  13. Survivorship Curves Fig. 9-11 p. 171

  14. Human Impacts on Ecosystems • Habitat degradation and fragmentation • Ecosystem simplification • Genetic resistance • Predator elimination • Introduction of non-native species • Overharvesting renewable resources • Interference with ecological systems

  15. Learning from Nature • Dependence on Nature—we need the earth but the earth does not need us • Interdependence—all organisms on earth are dependent on one another • Unpredictability—things we do have unexpected or unintended side effects • Limited resources –we continue to deplete and degrade the Earth’s natural capital • Recycle wastes—we must find ways to use waste for energy