Chapter 8Understanding 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? You and your neighbor’s kitty? The pebbles in the gravel lot?

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Investigation

Bunnies Selective Pressure : Food Mutation: Long Teeth Questions

1. What happens to the population?2. Why do you think this happens?

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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.

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Properties of Populations Density- amount per unit area

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Properties of Populations Dispersion- how individuals

are spread over a given space

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How Does a Population Grow? Growth rate: a change in the

size of a population over time

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Growth Rate = Births_

Deaths

Can be +, -, or 0 What would happen if…

How Fast Can a Population Grow? Video

Terms: Exponential growth Carrying Capacity Logistic Population Growth Range Dispersion Intraspecific Competition Interspecific Competition

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Homework

Wonder Journal Due Watch

http://education-portal.com/academy/lesson/populations-density-survivorship-and-life-histories.html#lesson and complete QuizStar quiz

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Today’s Tasks

Share Wonders Homework Questions 8.2 Lecture Part 1 Vocabulary Review

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Homework Review

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Significant Considerations:

• # of offspring

• Parental Care

• Resource allocation

Goal: Reproduce Successfully = Survival of Species

Homework Review

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Carrying Capacity = “k”

8.2 How Species Interact with Each Other

Video Terms (start at 7:00 min)

Abiotic Factors Habitat Niche Density-Independent Factors Density-Dependent Factors Predator

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Term Review

Habitat vs. Niche

Density-Dependent Factors Limited resources Infectious (Contagious) Disease

Density-Independent Factors Weather Disease (Cancer)

where. how.

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Predation

Density Dependent or Density Independent?

What makes a predator more successful?

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Draw a Successful Predator

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Other Species Interactions

Interaction Effects Example Additional Notes

Competition Direct vs. IndirectNiche restriction

Predation Adaptations

Parasitism

Mutualism Examples

Commensalism Examples

Symbiosis- a relationship in which two species live in close association

R/K Selection Theory 8:20- 9:10

Predator Adaptations

Defensive Adaptations

Camouflage Chemical Warfare Mimicry

Batesian Mullerian

Offensive Adaptations

Speed, ambush tactics

Venom

Back

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Batesian Mimicry

Back

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Mullerian Mimicry

Back

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CamouflageBack

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MutualismBack

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CommensalismBack

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R/K Selection Theory

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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

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

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Percentage of Population Surviving

Time

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

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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

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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.

Categorize Your Vocab

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Homework

Test Friday! Chapter 8, all notes and terms Don’t forget the video notes PowerPoint will be posted under

“Assignments” Wonder Journal Tomorrow

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