How Many Frogs Live In That Pond?
Name:__________________________
1. What is a population?
A population is a _________ of individuals of the _________ species that live and _________ in
the same __________.
2. What can cause a population to increase?
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
3. What can cause a population to decrease?
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
4. What is a mark-recapture population model?
A mark-recapture population model is a ______________ relationship between the number of
__________ animals that are ____________ and the __________ population number, which is
_____________.
5. What is a mark-recapture population model used for?
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
6. What two variables must be controlled if you use a mark-recapture population
model?__________________________________________________________________
________________________________________________________________________
7. The Lincoln-Petersen population model:
N = (n1)X(n2)
(m2)
N = The total population number.
n1 = The number of animals caught during the first sampling session.
n2 = The number of animals caught during the second sampling session.
m2 = The number of animals found to be marked during the second sampling session.
n1 (the number of frogs
caught the first time)
The Frog Population Data
n2 (the number of frogs
caught the second time)
m2 (the number of frogs
caught that were marked)
8. Now we have to put the data into the equation.
N = (________)X(________)
_____________
9. Multiply n1 by n2 and write down the number you get.
10. Now divide the number you got from #9 by m2 and write down the number that you
get.
11. What does the answer you got for #10 represent?
________________________________________________________________________
________________________________________________________________________
12. What are three things that can negatively impact a population?
1. _____________________________________________________________________
2. _____________________________________________________________________
3. _____________________________________________________________________
_____________________________________________________________________
13. Why is monitoring animal populations important?
1. ________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
2. ________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
3. ________________________________________________________________________
________________________________________________________________________