Measuring Distribution Flashcards
1
Q
What is abundance?
A
-the number of individuals of a species in area at a given time
2
Q
What 4 factors affect abundance?
A
-immigration
-birth
-emigration
-death
3
Q
How do you work out the estimated population?
A
number of individuals in a sample / area of sample
4
Q
What is the capture-recapture equation?
A
N = (M x S) / R
5
Q
What is N?
A
-population size estimate
6
Q
What is M?
A
-marked individuals released
7
Q
What is S?
A
-size of second sample
8
Q
What is R?
A
-marked animals recaptured
9
Q
What are the problems with capture-recapture?
A
-significant changes (death/immigration)
-marks ‘lost’
-no change is difficulty catching them
-random mixing
10
Q
Why do you use simpsons index after?
A
-to find diversity
-can compare different habitats
