Population Growth Model

Question 1

Population Growth Model

Answer 1

Mathematical equations that can be used to predict population size at any moment in time

Question 2

Population Growth Model
What is shows

Answer 2

The number of offspring an individual can produce in a given time period, minus the deaths of the individual or its offspring during the same period

Question 3

Intrinsic Growth Rate (r)

Answer 3

The maximum potential for growth of a population under the ideal conditions with unlimited resources

Question 4

When food is abundant organisms have a tremendous ability to

Answer 4

Reproduce

Question 5

A high number of births and low number of deaths produces a high

Answer 5

Population Growth Rate

Question 6

When conditions are less than ideal due to limited resources, a populations growth rate will be lower than its intrinsic growth rate

Answer 6

because individuals will produced fewer offspring (or forgo breeding entirely) and the numbers of deaths will increase

Question 7

Exponential Growth Model

Answer 7

A growth model that estimates a populations future size (Nt) after a period of time (t) based on the intrinsic growth rate (r) and the number of reproducing individuals currently in the population (No)
density independent

Question 8

When populations are not limited by resources, growth can be very rapid because more births occur with each step in time

Answer 8

rapid because more births occur with each step in time

Question 9

J-shaped curve

Answer 9

The curve of the exponential growth model when graphed represents the change in a growing population overtime

Question 10

At first the population is so small because

Answer 10

it cannot increase rapidly because there are few individuals present to reproduce

Question 11

As the population, there are more reproducing individuals

Answer 11

the growth rate increases

Question 12

Logistic growth model

Answer 12

A growth model that describes a population whose growth is initially exponential, but slows as the population approaches the carrying capacity of the environment (k)

Question 13

As population size nears about one half of carrying capacity

Answer 13

Population growth begins to slow

Question 14

S-shaped curve

Answer 14

The shape of the logistic growth model when graphed. Used to predict the growth of population that are subject to density dependent constraints as the population grows. It doesn’t account for unpredictability

Question 15

Overshoot

Answer 15

When a population becomes larger than the environment carrying capacity

Question 16

Die-off

Answer 16

A rapid decline in a population due to death

Question 17

K-related species

Answer 17

A species with a low intrinsic growth rate that causes a population to increase slowly until it reaches carrying capacity

Question 18

R relates species

Answer 18

A species that has a high intrinsic growth rate which often leads to population overshoots and die-offs

Question 19

K species

Traits

Answer 19

Population regulation - Density dependent
Life Span - Long
Time to reproduce maturity - Long
Number of reproductive events - Few
Number of offspring - Few
Size of offspring - Large
Parental Care - Present
Population Growth Rate - Slow
Population dynamics - Stable, near carrying capacity

Question 20

R-related species

Traits

Answer 20

Population regulation - Density independent
Life Span - Short
Time to reproduce maturity - Short
Number of reproductive events - Many
Number of offspring - Many
Size of offspring - Small
Parental Care - Absent
Population Growth Rate - Density independent
Population dynamics - Highly variable

Question 21

Survivorship Curve

Answer 21

A graph that represents the distinct patterns of species survival as a function of age

Question 22

Type 1 survivorship curve

Answer 22

A pattern of survival overtime in which there is high survival throughout most of the lifespan, but then the individuals start to die in large numbers as they approach old age ) curve (slanted)

Question 23

K selected species have what kinds of curves?

Answer 23

Type 1 curves
Elephants,Whales,Human

Question 24

Type 2 survivorship curve

Answer 24

A pattern of survival over time in which there is a relatively-constant decline in survivorship throughout most of the lifespan —- straight line

Question 25

What animals/ plants would be
Type 2 survivorship curve ?

Answer 25

Coral
Squirrel

Question 26

Type 3 survivorship curve

Answer 26

A pattern of survival overtime in which there is low survivorship early in life with few individuals reaching adulthood

Question 27

What kinds of species have Type 3 survivorship curve?

Answer 27

Includes r related species mosquitoes, dandelions ) curve (slanted)

Question 28

Corridor

Answer 28

Strips of natural habitat that connect populations

Question 29

Meta-population

Answer 29

A group of spatially distinct populations that are connected by occasional movements of individuals between them

Question 30

Meta-population
Is growing due to what?

Answer 30

Human intervention

Question 31

Interbreeding depression

Answer 31

When individuals with similar genotypes - typically relatives - breed with each other be produce offspring that have an impaired ability to survive and reproduce

Question 32

When does Interbreeding Depression occur

Answer 32

Occurs when each parent carries one copy of a harmful mutation in his of her genome. When the parents breed some of their offspring receives two copies of the harmful mutation and as a result have poor chances of survival and successful reproduction

Question 33

Small populations are more vulnerable than large populations to

Answer 33

Catastrophes

Question 34

I’m a meta population, occasional immigrants from larger nearby populations can add to the size of the population and do what?

Answer 34

New genetic diversity, which reduces the risk of extinction

Question 35

Meta populations provide a species with

Answer 35

Protection against threats such as disease. Important part of preserving biodiversity