1. Chapter 14 Regulation of POPULATION SIZE
Chapter Opener
Chapter 14 Regulation of POPULATION SIZE
What stops population growth?
What determines average abundance?

2. 4 POPULATIONS OF SAME SPECIES
Figure 14-1
4 POPULATIONS OF SAME SPECIES
Good habitat

3. a) Density dependent rate: As a
Figure 14-2
a) Density dependent rate: As a
population density rises, birth decreases
and death increases
B,C) Density independent rate: As a
population density rises, rate does not
change

4. Population regulation process
Figure 14-4
Population regulation process
Extrinsic Intrinsic

5. Figure 14-5
See page 435

6. Metapopulation: Dot: animal or plant Arrow: dispersal Circle: habitats
Figure 14-6
Dot: animal or plant
Arrow: dispersal
Circle: habitats
Metapopulation:
Local population in patch that are linked together by dispersal

7. Figure 14-7
3 years
Small patches supported small population and had a greater chance if going
Extinct.

8. Allee Effect: What is the difference between
Figure 14-9
Allee Effect: What is the difference between
standard population model and population with
allee effect?
Zero growth
Allee (1931) pointed out that undercrowding could be harmful to social species
as overcrowding

9. Example: Huttons’s shearwater (New Zealand)