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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.

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Presentation on theme: "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."— Presentation transcript:

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 1. What happens to the population? 2. 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: a change in the size of a population over time 8:20-9:10 Growth Rate = Births _ Deaths Can be +, -, or 0 What would happen if…

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 portal.com/academy/lesson/popula tions-density-survivorship-and-life- histories.html#lesson and complete QuizStar quizhttp://education- portal.com/academy/lesson/popula tions-density-survivorship-and-life- histories.html#lesson 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 9:15—10:05 Significant Considerations: # of offspring Parental Care Resource allocation Goal: Reproduce Successfully = Survival of Species

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

13 8.2 How Species Interact with Each Other

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

15 Term Review Habitat vs. Niche Density-Dependent Factors Limited resources Infectious (Contagious) Disease Density-Independent Factors Weather Disease (Cancer) where.how. 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 InteractionEffectsExampleAdditional Notes CompetitionDirect vs. Indirect Niche restriction PredationAdaptations Parasitism MutualismExamples CommensalismExamples Symbiosis- a relationship in which two species live in close association R/K Selection Theory 8:20- 9:10

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

20 Batesian Mimicry Back 8:20- 9:10

21 Mullerian Mimicry Back 8:20- 9:10

22 Camouflage Back 8:20- 9:10

23 Mutualism Back 8:20- 9:10

24 Commensalism Back 8:20- 9:10

25 R/K Selection Theory 8:20- 9:10  Online Notes 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 Time

26  Online Notes 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 R/K Selection Theory 8:20- 9:10 Percentage of Population Surviving Time

27  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.” R/K Selection Theory 8:20- 9:10

28 Vocab List  Exponential growth  Carrying Capacity  Logistic Population Growth  Range  Dispersion  Intraspecific Competition  Interspecific Competition  Abiotic Factors  Habitat  Niche  Density-Independent Factors  Density-Dependent Factors  Predator  Survivorship Curve  Types I, II, III Survivorship  Life History  K-Selection  R-Selection  Predation  Population  Parasitism  Mutualism  Commensalism  Symbiosis  Growth Rate 8:20- 9:10 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.

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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