Show:
Vocabulary
Population Characteristics
Limiting Factors
Growth Rates
Population Ecology
100
The number of organisms per unit area
What is population density
100
_______________ is a group of the same species in the same place at the same time.
What is population
100
Limiting factors can be abiotic or biotic. True or False
True
100

What mortality mean?

Death rate

100
The study of ________________ helps to predict changes in human population
What is demographics (demography)
200
any factor in the environment that does not depend on the number of members in a population per unit area
What is density independent factors
200

What are the three types of dispersion?

What is clumped, random, and uniform

200
Give an example of a density independent factor.
What is any natural disaster or weather event.
200

If the birth rate is > the death rate what happens to population?

increases

200

Exponential growth in human population is due to

a lot of resources, low death rate
300
the number of individuals moving away from a population
What is emmigration
300

What does a survivorship curve show?

a) how many individuals survive at each age in a species

b) rate of immigration and emigration within a population

c) the growth of population size over time

how many individuals survive at each age in a species

300
Give an example of density dependent factor
parasites, predation, competition etc
300

To assess a population’s growth rate, an ecologist must know how many individuals are born, how many died, and how many move away in a given period of time. What else must an ecologist know? a.how many individuals find mates b.how many individuals move in from somewhere else c.how many individuals carry communicable diseases d.how many individuals are young or old

b. how many individuals move in from somewhere else

300

What type of growth has an S shaped curve?

Logistic growth

400

What is a habitat?

The natural environment in which an organism lives. (their home)

400

True or false: A healthy population size is growing or stable.

True

400
Which of the following statements is correct? a. Population size of predators increases when their prey is scarce. b. Competition for resources is density-independent when food is plentiful. c. Disease is density-dependent because transmission occurs more easily when a population is large. d. A change in average temperature is a density-dependent factor because fewer organisms can acclimate to variations in temperature.
c. Disease is density-dependent because transmission occurs more easily when a population is large.
400

Young adult male chimpanzees look for mates outside their own population. The males then take the females back to their group. Which of the following occurs in females’ original population? a.emigrationc.mortality b.immigrationd.natality

a. emigration

400
The three major causes of human deaths throughout recorded history are war, famine, and _____________
What is disease
500
the pattern of spacing of a population within an area
What is dispersion
500

Suppose in a population of 1000 wild horses, there are 400 births and 220 deaths. Also, 180 new horses join the population from an area that was destroyed by fire, and 380 horses are captured by park rangers. Describe the overall change in this horse population.

Because a total of 580 horses are added and a total of 600 horses are lost, the population decreases by 20 individuals. Mathematically, the population decreased by 20/1000 or 0.2%.

500

Which limiting factor is dependent on the density of the population? a. contagious fatal virus b. dumping toxic waste in a river c. heavy rains and floods d. widespread forest fires

What is a. contagious fatal virus

500

How does the logistic model of population growth differ from the exponential model? a.The exponential model shows a restricted growth rate. b.The logistic model considers the environment’s carrying capacity. c.The graph of the exponential model is S shaped. d.The graph of the logistic model has a longer lag phase.

b. The logistic model considers the environment’s carrying capacity.

500
Define zero population growth
when birth rate equals death rate and immigration rate equals emmigration rate