Population Ecology: Crash Course Ecology #2
Available at https://youtu.be/RBOsqmBQBQk or just youtube/google “Crash Course Ecology 2”
Name:
Date:
Period:
1. Define the following terms:
Population ecology
is looking at groups within a species and how they live together in one geographic
area
Community ecology
looks at groups of different organisms living together and figuring out how
they influence each other
Ecosystem ecology
the study of how all living and non-living things interact within an entire ecosystem
group of individuals
2. A population is a _________________________________________
of one species who interact
regularly.
a. What factors change a population’s density?
increases when new individuals are either born or immigrate and decreases because of deaths
or emigration
b. The geographic arrangement of individuals within the population is known as
dispersion
_____________________.
fecundity
c. ____________________, how many offspring an individual can have in a lifetime, makes a huge
difference in the size of a population.
limiting factors
d. Factors keeping population growth in check are called ______________________
_________________.
i. Population ecologists group these factors into two different categories:
density-dependent;
___________________________
and ______________________________.
density-independent
carrying capacity
e. The _________________________________ is the number of individuals that a habitat can
sustain with the resources that is has available.
proportional
f. Exponential growth means that the population grows at a rate ________________
to the size of
the population.
i. Humans have been on an exponential growth curve
Industrial Revolution
since the _________________________________.
logistic growth
g. _________________________________
means that the
population is limited to the carrying capacity of its habitat.
h. What’s the equation to calculate population growth?
rate of growth (r) is equal to the number of births minus the number of deaths divided by the
initial population size (N)
Ecology Crash Course Answer Keys
Crash Course 2 – Population Ecology
1. population ecology is looking at groups within a species and how they live together in one geographic
area; community ecology looks at groups of different organisms living together and figuring out how
they influence each other; ecosystem ecology is the study of how all living and non-living things interact
within an entire ecosystem
2. group of individuals
a. increases when new individuals are either born or immigrate and decreases because of deaths
or emigration
b. dispersion
c. fecundity
d. limiting factors
i. density-dependent; density-independent
e. carrying capacity
f. proportional
i. Industrial Revolution
g. logistic growth
h. rate of growth (r) is equal to the number of births minus the number of deaths divided by the
initial population size (N)