The abundance and distribution of Populations

Question 1

Individual

Answer 1

A single organism

Question 2

Natural selection operates at the level of

Answer 2

The individual

Question 3

Population

Answer 3

The individuals that belong to the same species and live in a given area at a particular time

Question 4

Evolution occurs at the level of

Answer 4

the population

Question 5

Community

Answer 5

All of the populations organisms within a given area

Question 6

Biosphere

Answer 6

The movement of air,water,heat around the globe

Question 7

Population Ecology

Answer 7

The study of factors that cause populations to increase or decrease

Question 8

To understand how populations overtime change overtime we must first examine the basic
characteristics of populations. These characteristics are

Answer 8

Size, density, distribution, sex ratio, and age structure

Question 9

Population Size (N)

Answer 9

Total number of individuals within a defined area at a given time

Question 10

Population Density

Answer 10

The number of individuals per unit (or volume in the case of aquatic organisms) at a given time.

Question 11

Knowing a populations density and size can help scientists estimate

Answer 11

Whether the species is rare or abundant

Question 12

Scientists study population density to determine whether a population in a particular location is so dense it might

Answer 12

Outstrip it’s good supply

Question 13

Population Distribution

Answer 13

A description of how individuals are distributed with respect to one another

Question 14

Random distribution

Answer 14

No pattern

Question 15

Uniform distribution

Answer 15

Uniform and evenly spaced
Common for territorial animals and plants that produce toxic chemicals

Question 16

Clumped distribution

Answer 16

Clumped
Enhanced feeding opportunities or protection

Question 17

Population Sex Ratio

Answer 17

The ratio of males to female
In most sexually reproducing species it’s 50-50

Question 18

Population Age Structure

Answer 18

A description of how many individuals fit into a particular age category in a population

Question 19

Knowing a populations age structure helps ecologist predict

Answer 19

How rapidly a population can grow

Question 20

Limiting resource

Answer 20

A resource that a population cannot live without and that occurs in quantities lower than the population would require to increase insize

Question 21

If a limited resource decreases

Answer 21

So does the size of a population the depends on it

Question 22

Density-independent factor

Answer 22

Has The same effect on individuals probability of survival and amount of reproduction regardless of the population size

Question 23

Individual to Population to community to Ecosystem to Biosphere

Answer 23

Survival and reproduction. The unit of natural selection
The unity of evolution
Interactions Among species
Flow of energy and matter
Global process

Question 24

Density dependent factor

Answer 24

A factor that influences an individuals probability of survival and reproduction in a matter that depends on the size of the population

Question 25

Carrying Capacity (K)

Answer 25

The limit of how many individuals in a population the environment can sustain

Question 26

Knowing the carrying capacity for a species and its limiting resources helps us predict

Answer 26

How many individuals an environment can sustain

Question 27

density-dependent factors affect an individuals probability of survival and amount of reproduction depending on

Answer 27

Whether the population is large or small