20.1 Population Growth

Question 1

What is Population Density?

Answer 1

The number of individual organisms in a given area or volume

Question 2

What is the equation for population density?

Answer 2

D = N/A

Question 3

What are the three theoretical distribution patterns of populations?

Answer 3

Uniform, Random, and Clumped

Question 4

What are distribution patterns influenced by?

Answer 4

The distribution of resources in a habitat and the interactions among members of a population, or members of a community

Question 5

What is Clumped distribution?

Answer 5

When members of a population are found within close proximity to each other

Question 6

What is uniform distribution?

Answer 6

When individuals are evenly spaced over a defined area

Question 7

What does a population’s size depend on?

Answer 7

How much and how fast it grows

Question 8

What four processes can change the size of a population?

Answer 8

Births, Immigration, death, emigration

Question 9

What is the formula for change in population?

Answer 9

[births + immigration] - [deaths + emigration]

Question 10

What is Population Explosion?

Answer 10

When a population grows so rapidly that it spreads before it can be contained

Question 11

What is Population Crash?

Answer 11

When a population decreases very rapidly

Question 12

What is the formula for growth rate?

Answer 12

change in Population/change in time

Question 13

What is Per Capita Growth rate?

Answer 13

The change in population size per individual

Question 14

What is formula for Per Capita Growth Rate?

Answer 14

Change in population/original number of individuals

Question 15

What is Biotic Potential?

Answer 15

The highest per capita growth rate

Question 16

What factors influence Biotic Potential?

Answer 16

The # of offspring per reproductive cycle
The # of offspring that live long enough to reproduce
The age of reproductive maturity and the number of times that individuals reproduce in a life span
The life span of the individuals

Question 17

What is the Lag Phase?

Answer 17

The initial stage of exponential growth where there are only few organisms able to reproduce

Question 18

What is the Stationary Phase of exponential growth?

Answer 18

When the birth and death rate are equivalent

Question 19

What is Carrying Capacity?

Answer 19

The theoretical maximum population size that an environment can sustain

Question 20

What are the 3 types of factors that can limit a habitats carrying capacity?

Answer 20

Density Dependant Factors

Density Independent Factors

Question 21

What are some density dependant factors?

Answer 21

Parasites and disease. Finding prey

Question 22

What are some density independent factors?

Answer 22

Harsh weather

Question 23

What is Environmental Resistance?

Answer 23

The combined effects of the various interacting limiting factors

Question 24

What does R-selected strategies mean?

Answer 24

When a species produces close to its biotic potential

Question 25

What are the characteristics of species with r-selected strategies?

Answer 25

They have short life spans, early reproductive age, and they produce large broods of offspring

Question 26

What does K-selected strategies mean?

Answer 26

When a species lives close to their carrying capacity

Question 27

What are the characteristics of species with k-selected strategies?

Answer 27

They have few offspring per reproductive cycle , they often take a relatively long time to mature and live a relatively long time