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populations - study guide
Terms in this set (32)
density-dependent limiting factor examples
competition, predation, paratism, and disease
density independent limiting factors
usual weather, natural disasters, seasonal cycles, and certain human activities
main characteristics of population
same place, same species, interbreeding, same time
organisms compete for
food, space, and mates
members of the same species may
compete for resources when a population becomes crowded
a populations georgraphic distribution
the area inhabited by a population
another term for geographic distribution
number of individuals in a population in a given area at a given time
movement of individuals from a population
occurs wheb the individuals of a population reproduce at a constant rate
population can decrease in because
sometimes there are fluctuations
If more individuals are born than die in any period of time, how will the population change?
The population will increase
Which is true about exponential growth?
It does not continue in natural populations for very long. It continues in natural populations until the birthrate increases.
A population's growth will slow down when....
The birthrate and death rate are the same. The rate of immigration is equal to the rate of emigration.
Which is true about changes caused by density-independent factor?
Most populations can adapt to a certain amount of change.Periodic droughts can affect entire populations of grasses.Major upsets in an ecosystem can lead to long-term declines in certain populations.
what is the equation we use to calculate population density ?
dN/dt = rN
When does exponential growth occur?
when the individuals of a population reproduce at a constant rate
What are 3 ways that a growth rate may be stated, or expressed?
exponential growth, logistic growth, carrying capacity
Under ideal conditions with unlimited resources, how will a population grow?
When resources become less available, how does population growth change?
the number or organisms decreases and drops below the carrying capacity
When does logistic growth occur?
when a populations growth slows or stops after a period of exponential growth
What is the carrying capacity of the environment for a particular species?
the maximun number of individuals an ecosystem is capable of supporting
How will a population change if there is abundant space and food and if the population is protected from predators and disease?
the population will increase dramatically exponentially
a limiting factor
a factor that can limit the growth of a population
limiting factors may
reduce the birth rate and the increase the mortality rate
a density dependent limiting factor
is dependent upon population size
an example of a density dependent limiting factor
What are the prey and what are the predators in the predator-prey relationship on Isle Royale?
moose and wolves
Why does the wolf population on Isle Royale decline following a decline in the moose population?
if the moose population declines, the wolves will use their prey and therefore decline as well
How are parasites like predators?
parasites are like predators because they feed off of the other organism causing it harm
A limiting factor that affects all populations in similar ways, regardless of population size, is called a(an) density-independent factor. What are examples of density-independent limiting factors?
density independent factors include unusual weather, natural disasters, seasonal cycles, and certain human activities such as damming rivers of clear-cutting forests and forest fires
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