Population growth

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Biology

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24 Terms

1

Immigration

Populations moving into an area

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2

Emigration

Populations leaving an area

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3

Two factors causing an increase in population

Birth and immigration

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4

Two factors, causing a decrease in population

Death and emigration

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5

A stable population

B+I=D+E

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6

Population growth

There is more birth and immigration than death and emigration

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7

Population decline

There is more death and emigration than birth and immigration

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8

Example of type 1 survivorship

Human

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9

Example of type 2 survivorship

Rodents

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10

Example of type 3 survivorship

Fish, insects, amphibians

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11

Type 1

Shows decline in later stages of life

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12

Type 2

Shows a steady decline throughout all life stages

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13

Type 3

Shows decline in early stages of life

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14

Type 2 and 3

Have less time to give offspring because their morality rate is low is early stages of life. This leads to a higher population of offspring

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15

Most type 1 survivors take care of their offspring while ______ and ______ don’t

Type 2 and 3

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16

Humans might now show type 1 survivorship when…

They don’t want to take care of their kids, might not have enough resources to sustain a human life, or when the death rate is very high

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17

Lag phase

Phase of growth curve, when population is just beginning to colonize in an area.

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18

Exponential growth curve

J- curve, population growth appears to contribute unchecked

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19

Logistic growth curve

S-curve, keeps going up and down

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20

Environmental resistance and pressure

Causes population growth to slow down

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21

Carrying capacity

The steady population that an environment can sustain. Population size fluctuate around it. (Predators and weather conditions case this)

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22

Causes of rapid growth in populations

Environmental resources, availability of partners, less diseases, less predators

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23

Exponential growth

The phenomena of populations that double in size every generation

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24

Environmental resistance

Causes growth rates to slow down until a stable and sustainable population size is reached. (Such as a shortage of environmental resources))

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