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Table 2 Step-by-step calculation of the mean distance travelled (MDT) of field Aedes albopictus males released in the first experiment (April 2016)

From: Field evaluation of seasonal trends in relative population sizes and dispersal pattern of Aedes albopictus males in support of the design of a sterile male release strategy

  Annulus
1 2 3 4 5 6 Total
A. Radius inner (km) 0 0.025 0.05 0.075 0.1 0.125  
B. Radius outer (km) 0.025 0.05 0.075 0.1 0.125 0.150  
C. Area (km2) 0.001964 0.005891 0.009818 0.013745 0.017672 0.0251599  
D. Area total (km2)        0.0707
E. Number of traps 3 4 5 3 3 2  
F. Total number of traps        20
G. CF = (C/D)*F 0.55 1.67 2.78 3.89 5.00 6.11  
H 47 51 43 4 3 4  
I. ER = (H/E) * G 8.70 21.25 23.89 5.19 5.00 12.22  
J        56.20
K. Distance (A+B)/2 0.0125 0.0375 0.0625 0.0875 0.1225 0.1375  
L 0.109 0.799 1.493 0.454 0.562 1.680  
M        5.095486
MDT        0.066826
  1. Letters represent: A, inner radius of each annulus; B, outer radius of each annulus; C, area of each annulus; D, area total of the annuli; E, number of recapture sites in each annulus; F, the total number of traps; G, correction factor for each annulus; H, number of Ae. albopictus marked males recaptured in each annulus during the four days of the experiment; I, ER estimated recaptures as a total recapture; J, annuli sums totalled; K, median distance of each annulus; M, median