Question

Results (Data) Table 1. Population guess and count, and calculated population estimate based on numbers of captured, marked, and recaptured individuals using the simple mark recapture technique. Guess of population size = 390 M 148 C 21 RE7 148X21, 3,108 : +++ N Show calculations Count of population size = 592 % error = 390 1444) 592=269 Show colculations 592 Table 2. Population guess and count, and calculated population estimate based on numbers of captured, marked, and recaptured individuals usinga repeated mark-recapture technique. # Marked Individuals Trapping Time Population (MI) Captured (C) Recaptured (R) 1 Mi= 0 C1 = 36 R1 = 0 2 M2 = C2 = 30 R2 = 11 M3 = C3 = 30 R3 = 16 Me= 6=24 R = 13 Guess of population size 200 Show calculations Count of population 151 size % error = Show calculations

Answer 1

Ans:

R (marked recaptures)/ M (marked initially) = C (total in second sample)/ N (total pop. size).

N= M*C/R.

N = estimated Number of individuals in the population

M = number of individuals captured and Marked

C = total number Captured the second time (with and without a mark)

R= number of individuals Recaptured (those with a mark).

Now initially at trapping time 1 we capture 36 individuals and now we marked them all so marked individuals at trapping time 1 is equal to 36. Next time when we analyze the population again we recapture 11 of the previous marked individuals and new individuals we captured here is 19 so total marked individual at trapping time 2 is 36+30-11= 54; 36 were marked at trapping time 1 out of which 11 are recaptured and total captured at second trapping time is 30.

So generalized formula for M_i+1= M_i+C_i+1-R_i+1 and M_i = C_i for i=1.

Putting the values calculated from the data we get the table described below:

Trapping Time	Mi	Ci	Ri
1	36	36	0
2	54	30	11
3	68	30	16
4	79	24	13

Guess of Population size: 200.

N= (M₂*C₂+M₃*C₃+M₄*C₄)/(R₂+R₃+R₄)= (54*30+68*30+79*24)/(11+16+13)= 140.

Count of Population= 151.

% error= (Count of population Size- Estimated Population size)*100/Count of population size

= (151-140/151)*100= 7.285%.