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Chapter 8

Chapter 8. Understanding Populations. Definition. Population : all the members of a species living in the same place at the same time Are the following members of the same populations? Jesus, Mary, and Joseph? You and Justin Bieber? Your dog and your neighbor’s dog?

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Chapter 8

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  1. Chapter 8 Understanding Populations

  2. Definition • Population: all the members of a species living in the same place at the same time • Are the following members of the same populations? • Jesus, Mary, and Joseph? • You and Justin Bieber? • Your dog and your neighbor’s dog? • You and your neighbor’s kitty? • The pebbles in the gravel lot? 8:20-9:10

  3. Investigation • Bunnies • Selective Pressure : Food • Mutation: Long Teeth • Questions • What happens to the population? • Why do you think this happens? 8:20-9:10

  4. Population Characteristics • Breeding • Term: refers to group itself and size of group • Example: • You are a population of senior girls. • The population of the senior class is 56. 8:20-9:10

  5. Properties of Populations Density- amount per unit area 8:20-9:10

  6. Properties of Populations Dispersion- how individuals are spread over a given space 8:20-9:10

  7. How Does a Population Grow? Growth Rate Births Deaths _ = • Can be +, -, or 0 • What would happen if… Growth rate: a change in the size of a population over time 8:20-9:10

  8. How Fast Can a Population Grow? • Video • Terms: • Exponential growth • Carrying Capacity • Logistic Population Growth • Range • Dispersion • Intraspecific Competition • Interspecific Competition 8:20-9:10

  9. Homework Wonder Journal Due Watch http://education-portal.com/academy/lesson/populations-density-survivorship-and-life-histories.html#lesson and complete QuizStar quiz 8:20-9:10

  10. Today’s Tasks Share Wonders Homework Questions 8.2 Lecture Part 1 Vocabulary Review 9:15—10:05

  11. Homework Review Goal: Reproduce Successfully = Survival of Species • Significant Considerations: • # of offspring • Parental Care • Resource allocation 9:15—10:05

  12. Homework Review Carrying Capacity = “k” 9:15—10:05

  13. 8.2 How Species Interact with Each Other

  14. Video Terms (start at 7:00 min) Abiotic Factors Habitat Niche Density-Independent Factors Density-Dependent Factors Predator 12:35-1:25

  15. Term Review where. how. • Habitat vs. Niche • Density-Dependent Factors • Limited resources • Infectious (Contagious) Disease • Density-Independent Factors • Weather • Disease (Cancer) 12:35-1:25

  16. Predation Density Dependent or Density Independent? What makes a predator more successful? 12:35-1:25

  17. Draw a Successful Predator 8:20- 9:10

  18. Other Species Interactions Symbiosis- a relationship in which two species live in close association R/K Selection Theory 8:20- 9:10

  19. Predator Adaptations • Offensive Adaptations • Speed, ambush tactics • Venom Back Defensive Adaptations • Camouflage • Chemical Warfare • Mimicry • Batesian • Mullerian 8:20- 9:10

  20. Batesian Mimicry Back 8:20- 9:10

  21. Mullerian Mimicry Back 8:20- 9:10

  22. 8:20- 9:10 Camouflage Back

  23. 8:20- 9:10 Mutualism Back

  24. Commensalism Back 8:20- 9:10

  25. R/K Selection Theory • Online Notes • Currently OUTDATED theory • BUT…important because it is still referred to • According to the theory, • R-selected species = the species whose reproductive habits produced large amounts of offspring who had low chance of survival into adulthood • in other words, Type III survivorship curve Percentage of Population Surviving 8:20- 9:10 Time

  26. R/K Selection Theory • Online Notes • Currently OUTDATED theory • BUT…important because it is still referred to • According to the theory, • K-selected species = the species whose reproductive habits produced few offspring, had high parental care and resources, and who had high chance of survival into adulthood • in other words, Type I survivorship curve Percentage of Population Surviving Time 8:20- 9:10

  27. R/K Selection Theory • In actuality: reproductive strategies for individual species are more complex than this • they are a combination of these factors • “Each species' life history is uniquely adapted to maximize its reproductive success based on all of the factors that affect its fitness.” • “The factors that have the greatest effect on one species may not be very important to another species, even if it shares the same habitat.” 8:20- 9:10

  28. Vocab List • Directions:With a partner, create categories and classify these words. All words must belong to a category, and all categories must contain more than one word. • Survivorship Curve • Types I, II, III Survivorship • Life History • K-Selection • R-Selection • Predation • Population • Parasitism • Mutualism • Commensalism • Symbiosis • Growth Rate • Exponential growth • Carrying Capacity • Logistic Population Growth • Range • Dispersion • Intraspecific Competition • Interspecific Competition • Abiotic Factors • Habitat • Niche • Density-Independent Factors • Density-Dependent Factors • Predator 8:20- 9:10

  29. Categorize Your Vocab 8:20- 9:10

  30. Homework • Test Friday! • Chapter 8, all notes and terms • Don’t forget the video notes • PowerPoint will be posted under “Assignments” • Wonder Journal Tomorrow 8:20- 9:10

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