Transcript Chapter 5 Review PPT

Which would be least likely to be
affected by a density-dependent
limiting factor?
A large, dense population or
a small, scattered population
A small, scattered population
Two ways a population
can decrease in size?
decreased birthrate and emigration
Suppose that a species of fish is
introduced into a new environment in
an attempt to reduce the population of
insects. The fish has no natural
predators in the new environment. The
fish population would most likely
increase exponentially.
A disease resulting in the deaths of
one third of a dense population of bats
in a cave would be
density-dependent limiting factor.
The pattern of spacing
between individuals
across the range of a
population is its
distribution.
Something that controls
the growth or size of a
population is
a limiting factor.
How would you describe
a population that is
decreasing in size?
The death rate is becoming higher than
the birthrate.
The various growth phases
through which most
populations go are
represented on
a logistic growth curve.
If you know the range
of a population, then
you know
the areas that are inhabited by the population.
During some kinds of population
growth, the size of each generation of
offspring is larger than the generation
before it. So, as the population gets
larger, it grows more quickly. This
situation is called
exponential growth.
Demography is the
scientific study of
human populations.
The movement of
organisms into a
range is called
immigration.
If the death rate of a population is
greater than the birthrate, the
population
decreases
There are 150 Saguaro cactus
plants per square kilometer in a 10square-kilometer area of Arizona
desert. To which population
characteristic does this information
refer?
population density
____________ __________limiting
factors affect all populations, whether
the population size is two or two
hundred.
Density-independent
When you graph a population’s
exponential growth over time, you
will have an _________ graph.
J-shaped
___________ growth occurs when a
population’s growth slows or stops,
following a period of rapid growth.
Logistic
The __________ model of population
growth accounts for the influence of
carrying capacity.
logistic
An indication that a country has
completed the demographic transition
is a ____ birthrate and a _____death
rate.
Low, low
Emigration can cause a population to
____________________ in size.
decrease
Scientists who study human
populations and predict the growth
rate of the world and of individual
countries study the science of
____________________.
demography
A population of bacteria with an
unlimited supply of nutrients will
eventually show
____________________ growth.
exponential
If a population is undergoing logistic
growth, it may have a growth rate near
zero once the
____________________ has been
reached.
carrying capacity
Identify 3 limiting factors that depend
on population density.
Density-dependent limiting factors
become limiting only when the
population density—the number of
organisms in a given area—reaches a
certain level. These factors include
competition, predation, parasitism, and
disease.
Identify 3 limiting factors that do not
depend on population density.
Density-independent limiting factors
affect all populations in similar ways,
regardless of population size. These
limiting factors include weather, natural
disasters, and certain human activities,
such as damming rivers and clearcutting forests.
List the three patterns of distribution.
Random, uniform, clumped
List the four factors that affect
population growth.
birth rate
death rate
immigration
emigration
Compare and contrast the graph of
exponential growth to the graph of
logistic growth.
The pattern of exponential growth is
a J-shaped curve. The pattern of
logistic growth is an S-shaped curve.
What will reduce competition
within a species’ population?
Fewer individuals