1

Mon. Tues. Wed. Thurs. Fri.Week ofOct. 27

Independent project set-up

Week ofNov. 3

Forest ecology lab – dress for weather

Exam 2no OH

Week ofNov. 10

Independent project analysis

Week ofNov. 17

River ecology lab – dress for weather

LabExam

no OH

2

For exam:- Chaps. 6,7,8,13

- Chap. 14 – only equations and concepts we talked about in class

- Chapter 15 – only through p. 302.

3

Outline

Introduction

How are populations defined and measured?

How do populations grow?

How does population size change through time and space?

4

Figure 15.5

What causes population size (N) to fluctuate?

5

Properties that makealgae more likely tofluctuate than sheep?

6

Figure 15.6

Some populations show regular fluctuations between high and low - Periodic cycles

7

What causes cycles?

8

Time delays cause cycles especially in fast growing populations

9

Populations have “momentum” – can be delays between changes in environment and response in terms of birth and death rate

Population can overshoot K and then crash

What causes delays?

10

Figure 15.12

50 100 1500

Time(days)

fecundity=density-dependentadult survival = less so

11

Structure of course

Environmental variability

Organisms

Ecosystems

Populations

Species interactions

Communities

Applied Ecological Issues