Refer to the mark–recapture equation below. Suppose researchers mark 20 Pacific

Question

Refer to the mark–recapture equation below.



Suppose researchers mark 20 Pacific giant salamanders on the first day of sampling. On the second day, 50 salamanders are captured, of which 10 are marked. In the equation, n1 is the total number of individuals in the first sample (captured, marked, and released); n2 is the total number of individuals in the second sample; and M is the number of marked individuals recaptured in the second sample. Which is the best estimate of the overall size of this salamander population? 500 50 1000 100 200

Explanation / Answer

n1 is the total number of individuals in the first sample (captured, marked, and released)

n1 =20

n2   is the total number of individuals in the second sample

n2=50

M is the number of marked individuals recaptured in the second sample

M=10

N= (n1xn2) / M = (20x50)/10 = 1000/10 = 100

Answer is 100

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