CONCEPT 3: POPULATION ECOLOGY
– ANALYZING DENSITY, DISPERSION,
DEMOGRAPHICS, GROWTH, AND
FACTORS THAT AFFECT GROWTH.
Chapter 53 in Campbell
p. 294-297 in Holtzclaw, Qs #3, 21, 22, 23 p. 304
POPULATION ECOLOGY
You must know:
 How density, dispersion, and demographics can
describe a population
 The differences between exponential and logistic
growth models of population growth
 How density-dependent and density-independent
factors can control population growth
TRY THIS!

What kind of distribution does the following
represent?
TRY THIS!

What kind of distribution does the following
represent? CLUMPING 
WORKSHEET: ACT “52.1”

Any Questions?

Let’s go over...
HOW CAN DENSITY, DISPERSION, AND
DEMOGRAPHICS CAN DESCRIBE A
POPULATION?
Population
 Density
 Dispersion

Clumped
 Uniform
 Random


Demography
Type I survivorship
 Type II survivorship
 Type III survivorship
 Demographic transition

TRY THIS!

Describe the Canadian human population in
terms of density, dispersion, and demographics...
TRY THIS!

Describe the Canadian human population in
terms of density, dispersion, and demographics...
Overall low density
 Clumped Dispersion
 Type I Survivorship

WHAT ARE THE DIFFERENCES
BETWEEN EXPONENTIAL AND LOGISTIC
GROWTH MODELS OF POPULATION
GROWTH?

Life History
Age of reproduction
 Frequency of
reproduction
 Number of offspring per
reproduction


How do the life histories
of the dandelion and the
coconut palm compare?
WHAT ARE THE DIFFERENCES
BETWEEN EXPONENTIAL AND LOGISTIC
GROWTH MODELS OF POPULATION
GROWTH?

Exponential Growth Model
WHAT ARE THE DIFFERENCES
BETWEEN EXPONENTIAL AND LOGISTIC
GROWTH MODELS OF POPULATION
GROWTH?

Logistic Growth Model

K=carrying capacity
WHAT ARE THE DIFFERENCES
BETWEEN EXPONENTIAL AND LOGISTIC
GROWTH MODELS OF POPULATION
GROWTH?

What type of growth model does this Daphnia
show?
WHAT ARE THE DIFFERENCES
BETWEEN EXPONENTIAL AND LOGISTIC
GROWTH MODELS OF POPULATION
GROWTH?

r-selection – density
independent selection



vs
K-selection – density
dependent selection
Density dependent factors
include”
Competition
 Territoriality
 Disease
 predation

TRY THIS!
1) Which of the following best describes
opportunistic, or r-strategy, organisms?
(a) They reach sexual maturity rapidly
(b) They reach their adult size slowly
(c) They attain a large body size
(d) They live for a long time
(e) The size of their population remains fairly
constant
TRY THIS!
1) Which of the following best describes
opportunistic, or r-strategy, organisms?
(a) They reach sexual maturity rapidly
(b) They reach their adult size slowly
(c) They attain a large body size
(d) They live for a long time
(e) The size of their population remains fairly
constant
TRY THIS!
a)What is the type of
growth from 1-7 days?
b) What does the dashed
line represent?
c) After 9 days, is the
population regulated by
density dependant or
independent factors?
TRY THIS!
a)What is the type of
growth from 1-7 days?
Exponential
b) What does the dashed
line represent?
Carrying capacity (K)
c) After 9 days, is the
population regulated by
density dependant or
independent factors?
Density dependent
NOW…
Do questions #3, 21, 22, 23 p. 304 in Holtzclaw
 Answer the AP free response question
(handed out in class) on a separate piece of paper
– DUE next class



We will be peer assessing your answers, you MUST
bring it to class!
Checkpoint next class covering Concept 2
(Biomes) and Concept 3 (Population Ecology)