Chapter 53: Population Ecology II Flashcards Preview

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Flashcards in Chapter 53: Population Ecology II Deck (14)
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1

Importance of population growth?

- Impacts harvesting regulations, endangered species

2

Learn from demography of human populations that...

- Humans cannot grow indefinitely

3

What is known about population growth of humans globally in different regions

- Grow most rapidly in Asian countries; relatively rapidly in Americas

4

Age structure (def. + what it informs us)

- Distribution of various age groups in a population (form semblance of pyramid)
- Illustrates growth pattern of population

5

Immigration (def.)

Influx of individuals

6

Emigration (def.)

Movement of individuals out of an area

7

Importance of immigration and emigration in metapopulations?

Populations are linked together through emigration and immigration

8

Metapopulation (def.)

Group of populations that are separated by space; spatially separated populations interact

9

Importance of habitat fragmentation?

- Affects the makeup of the population

10

Relationship between patch area and population extinction rate/distance between patches and population extinction rate?

- Colonization increases when distance between patches is lower
- Population also increases with larger patch area

11

How population ecologists study populations?

- Direct observations (traps, nets, fluorescent powder)
- Indirect observations (scat, tracks, other signs)

12

Estimating population size?

- N = sn/x (x = number of marked individuals recaptured in second sampling; s = number of individuals captured in first sample; n = total number of individuals captured in second sampling)

13

Challenges in studying populations?

- Incomplete sampling (incomplete and variable detection)

14

Dispersion pattern effects on sampling?

- Clumped = varying results