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Section 14-3 and 14-4 “Population”

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Presentation on theme: "Section 14-3 and 14-4 “Population”"— Presentation transcript:

1 Section 14-3 and 14-4 “Population”
Write everything that is underlined

2 Section 14.3 KEY CONCEPT: Each population has a density, a dispersion, and a reproductive strategy.

3 Populations Population density is a measurement of the number of individuals living in a defined space. Population dispersion refers to how a population is spread in an area. There are three types of dispersion illustrated on the next slides:

4 a. clumped

5 b.uniform

6 c. random

7 Type I: low level of infant mortality and an older population
Survivorship curves: Type I: low level of infant mortality and an older population common to large mammals and humans Type II: survivorship rate is equal at all stages of life common to birds and reptiles Type III: very high birth rate, very high infant mortality common to invertebrates and plants

8 Section 14.4 KEY CONCEPT: Populations grow in predictable patterns.

9 The size of a population is always changing.
Population Growth The size of a population is always changing. Four factors affect the size of a population: Births Deaths Immigration (Moving into an area) Emigration (Moving out of an area)

10 Exponential growth is a rapid population increase due to an abundance (lots of) of resources.

11 Logistic growth is due to a population facing limited resources.

12 Carrying capacity is the maximum number of individuals in a population that the environment can support. This is due to limited resources (food, shelter, space)

13 A population crash is a dramatic decline in the size of a population over a short period of time.

14 A limiting factor is something that keeps the size of a population down.
Limiting factors can depend on the density of individuals in the population or not.

15 Parasitism and disease
Density-dependent limiting factors are affected by the number of individuals in a given area. Predation Competition Parasitism and disease

16 Density-independent limiting factors limit a population’s growth regardless of the density.
unusual weather natural disasters human activities


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