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Section 2 Notes

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Submitted By mariaeo25
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Populations, demography, population models, competition, predation
Dr. Dorn

Introduction to Populations: (chapter 8)

A. What is a population?

What is a species?

Stickleback (fish) in lakes:

Primary population parameters –
B

I D E

B. Methods of estimating populations

1. Census Method

2. Sampling Methods

Census of sample areas
N = C/

N = population estimate
C = survey count = proportion of area

3. Relative Abundances – CPUE (catch per unit effort)

4. Mark-Recapture Estimates of population size

Lincoln-Peterson (closed populations)

Assumptions

5. Removal Design (closed population)

Examining the number of animal “removed” and cumulatively removed during successive catches

Gear set 1 2 3 4

Catch 76 54 35 24

Cumulative 0 76 130 165

Demographic Techniques (chapter 8)

A. What is Demography?

B. Life Table Analysis of populations

Cohort:

Parts of a life table analysis:

1. x and nx

2. Survivorship schedule: lx

a. Per capita mortality rate: qx

b. Survivorship patterns:

Type I Type II Type III

3. Getting the data:

cohort life tables

static life tables

3. Fertility schedule bx

Life history strategies:

- Semelparous

- Iteroparous

Costs:

5. The Intrinsic rate of increase (r)

a. Net Reproductive Rate (Ro):

b. Generation Time (G):

c. r ~ ln (Ro)/ G

r > 0

r = 0 r < 0

d. Stable and stationary age distributions

6. Reproductive value

Population Growth Models (chapter 9)

A. Models with discrete generations (no overlap)

1. Terminology
Nt = population size at time t
Nt+1 = population size at time t + 1.
R0 = net reproductive rate (# females produced per

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