1 / 15

Population Ecology

Population Ecology. CHAPTER 9 NOTES APES Ms. Miller. Key Concepts. Factors affecting population size. Species reproductive patterns. Species survivorship patterns. Conservation biology and human impacts on ecosystems. Population Dynamics and Carrying Capacity.

xarles
Download Presentation

Population Ecology

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

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

More Related