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2/11 Daily Catalyst Pg. 18 Population Ecology
 1. Compare and contrast the savanna and grassland biome.
 2. Give an example of a population.
 3. Describe the tundra biome.
2/11 Class Business Pg. 18 Population
Ecology
 Quiz #5 on Friday
 Ecology Research paper topic
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Sign up with Mrs. Ireland
Library work day on Friday
Rubric on Friday
Mardi Gras check in
 Test corrections due Monday after Mardi Gras
break
 I will post the key on Thursday-Friday
2/11 Agenda Pg. 18 Population Ecology
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Daily Catalyst
Class Business
Biome review
Population ecology
Practice questions
Exit Ticket #6 Population Ecology
Pg. 17 HW
 Why isn’t Earth’s climate uniform? To answer this,
include the factors that produce differences in
climates.
Objective
 We will be able to describe interactions
among living systems and their environment,
which result in the movement of populations.
Populations video clip
 In your notes, write down :
• 2 things populations work towards
• 3 reasons why populations increase/decrease
• http://www.ted.com/talks/hans_rosling_on_global_p
opulation_growth
Properties of population
 Key Point #1: The properties of populations:
 1. Population size
 2. Density
 3. Dispersion
 4. Age Diagrams
How many jelly beans are in the jar?!
Population Size
 Key Point #2: Population Size
 The number of organisms in a population
 “n”
 For example: The population size of
Environmental Science is n=35
 At times, we rely on estimation
Properties of population
 1. Population size
 2. Density
 3. Dispersion
 4. Age Diagrams
Density
 Key Point #3: Density
 The number of individual organisms per unit area
 For example: There are 55 spruce trees per square mile
Different species, of course, exist at different densities in their
environments, and the same species may be able to achieve one
density in one environment and another in a different
environment
 Do species space themselves out in an even manner?!
 NO!! But once again we can use estimation!
Properties of population
 1. Population size
 2. Density
3. Dispersion
 4. Age Diagrams
Dispersion Inquiry
Population Dispersion:
 Key Point #4: Dispersion
 The way organisms are spaced in an area.
•
Clumped
•
Uniform
•
Random
Dispersion Inquiry
Why do organism disperse in this
manner?
Clumped
• Most common
• Unequal distribution of
resources
• Mating and social
• Predation
• Hunting
Random
• Rare
• Spaced in an unpredictable
way
• Even environment
conditions
• Difficult to mate
UNIFORM
•
•
•
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Spaced in a predictable
way
Result of territorial
behavior
Competition for
resources
Even environment
conditions
Dispersion Inquiry
Properties of population
 1. Population size
 2. Density
 3. Dispersion
4. Age Diagrams
Age Diagrams
 “In the second or two it took to read this sentence, 21
babies were born somewhere in the world and nine
people died. The statistics may have changed a bit by
the time you read this, but births will still far
outnumber death. An imbalance between births and
deaths is the cause for population growth (or
decline).”
 How do we explain human population growth?
Key Point #5: Growth models
Exponential
• Nickname:

J-Curve
• Unregulated growth and
unlimited resources
• Sustainable?
Logistical
• Nickname:

S-Curve
• Effected by limited resources
• Population Stabilize
Age Diagrams
 Key Point #6:
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Definition: shows the number of organisms at
each particular age group.
 For example: there are 30 Environmental students in the 15-18
age range.
What influences age structures?
Age structures also reveal social and
economic trends
Stop and JOt
 How large of a population of humans can
Earth hold?
 Do we have resources to sustain 8 or 9 trillion
people?
Populations Recap
 What are the four properties of populations?
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Population size, density, dispersion, and age diagrams
 Define density:
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the size of the population per unit area
 What type of growth does a population with unlimited resources
exhibit?
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Exponential growth
Dispersion Notebook questions Pg.18
 1. What is the most common type of dispersion?
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a. List reasons why this pattern is most common.
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b. Give 3 examples of this pattern in a real ecosystem
 2. What is the likely dispersion pattern of fish that swim in schools,
seabird nesting on a small field, and thistles growing in a fairly uniform
field?
 3. What affects the size of populations? Think broadly and what affects
the human and non-human population?
 4. What would likely be the cause of bushes of one species growing in
one are in a uniform spacing pattern?
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a. random distribution of seeds
b. interactions among individuals in the population
c. chance
d. the varied nutrient supplies in that area
e. variation in sunlight
 5. Define dispersion:
 Name: _________ period: 2 date: 2/11 Score: _______/4 QP: _____
 Exit Ticket #6 Population Ecology
 1. What would likely be the cause of bushes of one species growing
in one area in a uniform spacing pattern?
 a. random distribution of seeds
 b. interactions among individuals in the population
 c. chance
 d. even nutrient supplies in that area
 2. What is the nickname for exponential curves?
 3. What type of dispersion patterns do lions show? Why?
 4. What is the symbol we use to represent population size?
1/28 Daily Catalyst
PAGE 9
1. In the temperate grasslands, Ecologist estimate there
are 789 bison, 23 wild horses, 7 million sunflowers.
Determine the population size of the bison, horses, and
sunflowers.
2.How are population size and population density
different from one another?
3.Finish graphing your data from Friday’s lab. If you were
absent, this lab needs to be made up.
1/28 Daily Catalyst
1. In the temperate grasslands, Ecologist estimate there are
789 bison, 23 wild horses, 7 million sunflowers.
Determine the population size of the bison, horses, and
sunflowers.
N= 789 bison, N=23 wild horses, and
N=7 million sunflowers
2. How are population size and population density
different from one another?
Pop. size is the number of individuals in a certain pop. and
density is the number of individuals per unit area.
 3. Finish graphing your data from Friday’s lab.
If you were absent, this lab needs to be made
up.
1/28 Class Business
 Extra Credit due today for Kevin and Akeira
 Ecology project
 Quiz #3 on Friday
 Population Lab make-up tomorrow during
lunch
 Honors topics due tomorrow (background
research is due Friday)
1/28 Agenda
 Daily Catalyst
 Class Business
 Population Notes
1/28 Objective Daily Objective
 We will be able to describe interactions among living
systems and their environment, which result in the
movement of populations.
 Page 9: Properties of populations
Brief Recap
 Population Size

The number (n) of organisms in a
population
 Population Density

The number of organisms per unit area
Properties of population
 1. Population size
 2. Density
3. Dispersion
 4. Age Diagrams
Dispersion Inquiry
Population Dispersion:
 Definition: the way organisms are spaced in an
area.
•
Clumped
•
Uniform
•
Random
Dispersion Inquiry
Why do organism disperse in this
Random
manner?
Clumped
UNIFORM
• Most common
• Unequal distribution of
resources
• Mating and social
behavior
• Predation and hunting
efficiency
• Very rare
• Spaced in an
unpredictable way
• Even environment
conditions
• Difficult to mate
• Interactions between
organisms
• Result of territorial
behavior
• Competition for
resources
• Environment/
resources are also even
Properties of population
 1. Population size
 2. Density
 3. Dispersion
4. Age Diagrams
 On Friday, you completed a lab on lily pad growth in a pond. The
lab asked you to double the number of lily pads every day until
half the pond was filled. Then you estimated how many days it
would take for the entire pond to be filled. Most of you would
take 5-6 days till fill the entire pond with lily pads. At the
beginning of the lab, it seemed like it would take a lot more then
7 days to fill the pond, but this was not the case because the lily
pad population grows in a specific way.
 Read the first paragraph on page 728
 “Population size fluctuates as new
individuals…”
Growth models
Exponential
• Nickname:

J-Curve
• Unregulated growth and
unlimited resources
• Sustainable?
Logistical
• Nickname:

S-Curve
• Effected by limited resources
• Population Stabilize
 What type of graph did the lily pad population make?
 What factors influence the growth of the lily pads?
Age Diagrams
 “In the second or two it took to read this sentence, 21
babies were born somewhere in the world and nine
people died. The statistics may have changed a bit by
the time you read this, but births will still far
outnumber death. An imbalance between births and
deaths is the cause for population growth (or
decline).”
 How do we explain human population growth?
Age Diagrams
 Definition: shows the distribution of various age
groups of a region and to determine the overall age
distribution of a population.
What influences age structures?
Age structures also reveal social and
economic trends
 How large a population of humans can Earth
hold?
 Do we have resources to sustain 8 or 9 million
people?
Test Corrections
 Due: MONDAY
 Test corrections are optional and a chance to bring up your test
grades. Since learning from our mistakes is essential for the learning
process, I will allow you to correct the missed questions from all
test.
1. Why you missed the question(didn’t study, misread the question)
2. What is the right answer (a, b, c, or d)
3. Why is that the correct answer (use notes, books, etc. )
You can earn up to half credit back on each problem you correct.
Movie Time
 During movies we are:
 Silent
 Respectful
 Mature
 If you do not want to watch the movie, put
your head down or work on other work. This
is not the time for talking and texting.
Ecology Exit Ticket #3
 1. What two factors make up an ecosystem?
 2. Give an example of a community.
 3. In what biome would buffalo and prairie dogs live? This biome is flat with
cold winters and hot summers.
 4. True/false: An organisms niche is not specific to that organism
Ecology Exit Ticket #3
 1. What two factors make up an ecosystem?
 Abiotic and biotic factors
 2. Give an example of a community.
 Elephants, Lions, and tall grass
 Owl, spruce trees, and mice
 3. In what biome would buffalo and prairie dogs live? This biome is
flat with cold winters and hot summers.
 Temperate grassland
 4. True/false: An organisms niche is not specific to that organism
 False