1. Environmental Science Do Now 10-25-17
Directions: Take your Do Now sheet out and define the following terms. 
Population
Population density
Density-dependent
Natality
Mortality
Birth rate
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Populations.ppt

2. Environmental Science Do Now 10-25-17 Key
Directions: Take your Do Now sheet out and define the following terms.
Population: all the individuals of a species that live together in an area
Population density: equals the number of individuals per unit area
Density-dependent: factors that are dependent on the population
Natality: birth rate
Mortality: death rate
Birth rate: the number of births in a given area
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Populations.ppt

3. Homework
Complete page 2 of the “Population Distribution” POGIL (If you were here yesterday, you should have completed and turned in page 1.)
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Populations.ppt

4. Environmental Science Objective
The student will demonstrate the ability to explain the growth of populations and factors, such as, infant mortality; by performing a close read and analyzing and plotting the two major types of population curves, j-shaped and s-shaped.
Mastery Level:
Each student can graph, label and interpret a j-shaped and an s-shaped population curve.
50 points of annotation comments on a close read article (Infant Mortality)
4/6 or better on TDQs based on the infant mortality article.
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Populations.ppt

5. Engage
Students will watch a YouTube video called “Infant Mortality in the United States is Surprisingly High”
Guide Question: What factors play a role in America’s infant mortality rate?
Source:
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Populations.ppt

6. Explore
Students will perform a close read on the article titled “Population Growth Patterns”. As the students read the article, they will annotate it using the symbols posted in the classroom. Students will also write textual comments in the margins of the article. Each annotation symbol is worth 2.5 points and each textual comment is worth 5 points. The goal is for each student to earn 50 points worth of annotations. Students will answer 5 text-dependent questions that are based on the article.
Source:
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Populations.ppt

7. Vocabulary Words – Populations
Population growth curve
Logistic Growth Curve
Exponential Growth Curve
Sigmoid Population (S-curve)[logistic growth curve]
J-shaped Population curve [exponential growth]
Carrying Capacity
Lag phase
Exponential growth phase
Stationary phase/Plateau phase
Death phase
Overshoot
Birth rate
Resources
Transitional phase
Limiting factors
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Populations.ppt

8. Unit IV: POPULATIONS Mr. Richards October 24, 2017 11/7/2018
Populations.ppt

9. Population: all the individuals of a species that live together in an area
Demography: the statistical study of populations, make predictions about how a population will change
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10. Three Key Characteristics of Populations
Size, number of individuals (N)
Density (N/ area)
Dispersion,
Random, uniform, clumped,
(appropriate scale)
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Populations.ppt

11. Three Key Characteristics of Populations
1. Size: number of individuals in an area
Characterized by (N)
Growth Rate:
Birth Rate (natality) - Death Rate (mortality)
(How many individuals are born vs. how many die)
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Populations.ppt

12. Three Key Characteristics of Populations
2. Density: measurement of population per unit area or unit volume
Pop. Density =
# of individuals ÷ unit of space
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13. 4 Factors that affect density
1. Immigration- movement of individuals into a population
2. Emigration- movement of individuals out of a population
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Populations.ppt

14. 4 Factors that affect density
3. Density-dependent factors- Biotic factors in the environment that have an increasing effect as population size increases
  Ex. disease
competition
parasites
4. Density-independent factors- Abiotic factors in the environment that affect populations regardless of their density
  Ex. temperature
storms
habitat destruction
drought
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Populations.ppt

15. Density-Dependent Factors
Density-dependent factors operate only when the population density reaches a certain level. These factors operate most strongly when a population is large and dense.
They do not affect small, scattered populations as greatly.
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Populations.ppt

16. Density-Independent Factors
Density-independent factors affect all populations in similar ways, regardless of the population size.
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Populations.ppt

17. Three Key Characteristics of Populations
Dispersion: describes their spacing relative to each other
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Populations.ppt

18. Dynamic characteristics of populations
Age distribution,
proportions of young, middle-aged, old
Differs in growing, stable, decreasing populations
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Populations.ppt

19. Factors That Affect Future Population Growth
Immigration + + -
Population
Mortality
Natality -
Emigration
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20. Changes in populations
Growth
Expansion of species’ populations may lead to evolution of new species
Decline
Shrinking species’ populations may lead to extinction
Small populations
Narrowly specialized species
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Populations.ppt

21. Changes in populations
ΔN = +B +I –D –E
+B = births (birth rate)
+I = immigrants (immigration rate)
– D = deaths (death rate)
– E = emigrants (emigration rate)
(For many [most] natural populations I and E are minimal.)
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Populations.ppt

22. Other factors that affect population growth
Limiting factor- any biotic or abiotic factor that restricts the existence of organisms in a specific environment.
EX.- Amount of water
Amount of food
Temperature
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Populations.ppt

23. Other factors that affect population growth
Carrying Capacity- the maximum population size that can be supported by the available resources
There can only be as many organisms as the environmental resources can support
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Populations.ppt

24. J-shaped curve (exponential growth)
Carrying Capacity Nu m b e r
Population will exceed the carrying capacity and become unstable.
J-shaped curve (exponential growth)
Carrying Capacity (k)
S-shaped curve (logistic growth)
Ok so
Population stabilizes as the it gets closer to its carrying capacity.
Time or Year
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Populations.ppt

25. Exponential Growth Phase
Plateau Phase
Transitional Phase
Exponential Growth Phase
Lag Phase
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26. Logistic model Logistic model works, to a point.
Real organisms have time lags for growth, time to develop eggs, flowers, etc.
seasonality, longevity
Real populations may exceed carrying capacity.
Easter Island
Pribloff Reindeer
Kaibab Deer
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Populations.ppt

27. Easter Island Discovered by Polynesians ~ A.D. 1000
Population grew to several thousand
Used trees for canoes to hunt dolphins
Used wood for cooking
Also ate birds, eggs, vegetables
Resources (trees) depleted
No canoes, no dolphins
Warfare over land, food resources
Population fell to ~ 100 when discovered by Dutch, Easter Sunday 1722.
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Populations.ppt

28. 2 Life History Patterns 1. “R” Strategists short life span
small body size
reproduce quickly
have many young
little parental care
Ex: cockroaches, weeds, bacteria

29. 2 Life History Patterns 2. “K” Strategists long life span
large body size
reproduce slowly
have few young
provides parental care
Ex: humans, elephants

30. Two general types of Life History Strategies
Life History trait
r-adapted, Opportunistic
K-adapted, Equilibrium
Offspring
Many, small (high r)
Fewer, large (low r)
Offspring survival
Low
High
Parental care
Rare
Common
Reproductive age
Early
Later
Reprod. “seasons”
1-few
Many
Habitat
Unstable, temporary
Stable, permanent
Competitiveness
Population regulation
Density independent
Density dependent
Population fluctuation
Irruptive
Stable near K

31. Life History Strategies
Survivorship curves of Opportunistic and Equilibrium species
Opportunistic have Type III
Equilibrium have Type I
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Populations.ppt

32. Life History Strategies
Fluctuating populations of two interacting populations
Based on pelts sold by Canadian trappers to the Hudson Bay Company, ~
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Populations.ppt

33. Extend/Evaluate
Population Growth Activity Part A. Human Population Growth and analysis questions 1-9.
Graph the data
Answer the analysis questions 1-9 that follow.
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Populations.ppt