1 / 103

Plan – Week 3

Plan – Week 3. Test on 5.1 – Today or Tuesday… Test on 5.2 (Greenhouse Effect, Carbon Cycle and Climate Change) : Friday In between….5.3 and Topic G.3: Population Ecology and Invasive Species. 5.3 Population Ecology. What you need to know about populations (Topic 5.3, SL and HL).

faris
Télécharger la présentation

Plan – Week 3

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. Plan – Week 3 • Test on 5.1 – Today or Tuesday… • Test on 5.2 (Greenhouse Effect, Carbon Cycle and Climate Change) : Friday • In between….5.3 and Topic G.3: Population Ecology and Invasive Species

  2. 5.3 Population Ecology

  3. What you need to know about populations (Topic 5.3, SL and HL) • Key Factors which determine population size • You must know how to draw, and interpret, a classical population growth curve • Factors which set limits to population increase

  4. What ELSE you need to know about populations (Topic G, SL and HL) • You must understand the impacts of alien species • You must be able to give three examples of alien species in ecosystems • You must outline one example of biological control of an invasive species

  5. What ELSE you need to know about populations (Topic G, HL, NEXT YEAR) • You must understand and distinguish between r-strategies and K-strategies • You must understand environmental conditions that favour r- or K-strategies • You must understand a method to estimate population size (catch and release)

  6. Let’s start simple… What is a population?...

  7. Human Population • At what point in human history did the population reach 1 billion people? • It took all of human history up to the early 1800s for world population to reach 1 billion people, and until 1960 to reach 3 billion. Today, the world gains 1 billion people every 11 years.

  8. Let’s Review: What is a population? (5.1.1) A group of organisms of one species that interbreed and live in the same place at the same time

  9. Key Characteristics of Populations 1: Geographic Distribution

  10. Characteristics of Populations 2: Population density The number of individuals per unit area

  11. A fewsaguro cactus • A flock of birds • A field of sunflowers • Turtles grouped to sun Population Density • Can vary tremendously depending on the species and its ecosystem

  12. Population Density What are some benefits of living close together or in a clumped population? • Help finding food • Protection from predators or wind • Easier to find species

  13. Population Density What are some drawbacks(negatives) of living in a clumped population? • Crowded living areas • Battles over food/shelter • Easier for disease to spread

  14. Characteristics of Populations: Evaluating Growth Rate The amount by which a population’s size changes in a given time

  15. Let’s imagine a brand new population of…. • Let’s think about how it changes over time…. • How does it arrive in its new habitat? • Which factors will affect population size over time? • You have two minutes…

  16. Time Remaining 2:00 www.SummitStudies.com

  17. Time Remaining 1:00 www.SummitStudies.com

  18. Time Remaining :55 www.SummitStudies.com

  19. Time Remaining :50 www.SummitStudies.com

  20. Time Remaining :45 www.SummitStudies.com

  21. Time Remaining :40 www.SummitStudies.com

  22. Time Remaining :35 www.SummitStudies.com

  23. Time Remaining :30 www.SummitStudies.com

  24. Time Remaining :25 www.SummitStudies.com

  25. Time Remaining :20 www.SummitStudies.com

  26. Time Remaining :15 www.SummitStudies.com

  27. Time Remaining :10 www.SummitStudies.com

  28. Time Remaining :09 www.SummitStudies.com

  29. Time Remaining :08 www.SummitStudies.com

  30. Time Remaining :07 www.SummitStudies.com

  31. Time Remaining :06 www.SummitStudies.com

  32. Time Remaining :05 www.SummitStudies.com

  33. Time Remaining :04 www.SummitStudies.com

  34. Time Remaining :03 www.SummitStudies.com

  35. Time Remaining :02 www.SummitStudies.com

  36. Time Remaining :01 www.SummitStudies.com

  37. Time Remaining 00:00 www.SummitStudies.com

  38. 5.3.1 What are the four factors that affect populations?

  39. What affects population size? Number ofbirths (natality) Number ofdeaths (mortality) Number of individuals thatenter (immigration)orleave (emigration)

  40. Population Growth • Migration- periodic movements of populations away from and back to their place of origin (not what we are talking about here) • Irregular movements of some individuals out of an area, into a new area, with no return - affects population size • Immigration – movement of individuals into an area • Population increases in size • Emigration – movement of individuals out of an area • Population decreases in size

  41. Population Growth • Why would an animal immigrate to or emigrate from a population? • Competitive pressureson some individuals • To find food, better livingconditions, or a mate

  42. Evaluating population growth…doing the mathematics… If a population has unlimited food and spaceand is protected from predatorsand disease, what will happen to the size of the population?

  43. What would population growth looks like on a graph when an population colonizes a new habitat? Draw a graph and explain the shape. Work with a partner. You have five minutes.

  44. Time Remaining 2:00 www.SummitStudies.com

  45. Time Remaining 1:00 www.SummitStudies.com

  46. Time Remaining :55 www.SummitStudies.com

  47. Time Remaining :50 www.SummitStudies.com

  48. Time Remaining :45 www.SummitStudies.com

More Related