Table 1.
The proportion of occurrence and average number of Anopheles arabiensis breeding sites in sentinel grid cells across different ecological zones in La Reunion Island from 1996 to 2009.
| Studied zone | Sampling period | Numbers of grids sampled | Number of positive grid cells (%) | Total number of breeding sites |
Mean (M) number of breeding sites (SEM) | Observed maximum number | Variance (V) | Dispersion (V/M) |
|---|---|---|---|---|---|---|---|---|
| NORTHEAST | 1997 | 1972 | 136 (6.90) | 99 | 1.37 (0.07) | 6 | 0.60 | 0.44 |
| 2003 | 2129 | 305 (14.33) | 109 | 2.80 (0.30) | 17 | 10.34 | 3.69 | |
| 2009 | 2317 | 558 (24.08) | 176 | 3.17 (0.32) | 27 | 18.32 | 5.78 | |
| SOUTH | 1997 | 1470 | 34 (2.31) | 26 | 1.31 (0.12) | 3 | 0.38 | 0.29 |
| 2003 | 1552 | 150 (9.66) | 60 | 2.50 (0.22) | 10 | 3.13 | 1.25 | |
| 2009 | 1616 | 256 (15.84) | 102 | 2.51 (0.28) | 16 | 8.11 | 3.23 | |
| WEST | 1997 | 1164 | 285 (24.48) | 100 | 2.85 (0.26) | 16 | 7.01 | 2.46 |
| 2003 | 1003 | 52 (5.18) | 31 | 1.68 (0.17) | 4 | 0.95 | 0.57 | |
| 2009 | 1185 | 246 (20.76) | 40 | 6.15 (1.84) | 67 | 136.02 | 22.11 |
Prevalences (%) are given for the total numbers of grid cells within each zone that did have at least one larval habitat in the specified year. Total and mean numbers of breeding sites per individual grid cell are also displayed. Data is presented separately for each of the 3 study periods