Section 2.3
Name:
Section Title: Ecology: the population level
Opening Activity:
Review of Old Information:
This virtual lab has instructions on the left hand side and also contains pages to enter data and questions.
However, you will enter data and answers using the data table below and the questions on the following
page.
How to get there: ( http://glencoe.mcgraw-hill.com/sites/dl/free/0078757134/383928/BL_04.html )
Data Table
Day
O
Day
2
Day
4
Day
6
Day
8
Day
10
Day
12
Day
14
Day
16
P. aurelia grown
alone, cells/mL
P. caudatum grown
alone, cells/mL
P. aurelia grown in
mixed culture, cells/ mL
P caudatum grown in mixed
culture, cells/mL
1
1
1
1
5
5
4
5
22
11
14
10
38
22
29
8
40
24
35
6
45
28
36
2
45
26
41
2
44
26
41
0
44
26
41
0
1. On what day did the Paramecium caudatum population reach the carrying capacity of the environment when it was grown
alone? How do you know?
2. On what day did the Paramecium aurelia population reach the carrying capacity of the environment? How do you know?
3. Explain the differences in the population growth patterns of the two Paramecium species. What does this tell you about how
Paramecium aurelia uses available resources?
4. Explain how this experiment demonstrates that no two species can occupy the same niche.
New Information: Human Population Growth
–1970: _________ billion
–2011: __________ billion
–Growth Rate ______%
–Suggested carrying capacity = __________ billion
Why?
•Life Span and Life Expectancy: declining _________________, not increasing ______________, is
primary cause for most population growth (higher income = higher life exp.)
•+ Pressures: factors __________________ desires to have babies (support, status, male pride,
“birth dearth,” etc.)
•- Pressures:
–higher __________________
--socioeconomic status
•Many humans survive ______________ of their potential life span and die at old age.
•Survivorship of many wild birds is the ____________ throughout their life span once fledged.
•In organisms that produce ________________ offspring, survivorship is ______________ among the juveniles and high
after that (ex.fish).
_____________________________________________________________________