Skip to main content

Advertisement

Table 4 Seasonal variation in Anopheles larval densities over a 12-month sampling period among different aquatic habitats in three study sites in Mwea, Kenya (Density is expressed as number of larvae per 10 dips)

From: Anopheles larval abundance and diversity in three rice agro-village complexes Mwea irrigation scheme, central Kenya

   Month  
Village Habitat type Apr May Jun Jul Aug Sept Oct Nov Dec Jan Feb Mar Mean
Mbui Njeru Canal 0.7 0.7 0.1 1.1 0.3 2.5 1.3 1.6 1.4 1.1 1.0 1.0 1.05
  Marsh 0.0 0.0 0.2 a- 0.7 - 2.1 1.0 0.0 - 0.7 16.7 1.78
  Rice field 2.2 0.7 1.0 0.7 1.4 6.0 3.0 0.4 4.2 2.0 3.0 4.4 2.41
  Temporary pool 7.9 2.9 0.5 - 0.9 0.7 0.5 1.1 1.8 0.3 0.1 0.5 1.42
  Water reservoir 0.0 - - - - - 0.0 0.0 2.7 - - 0.0 0.22
  Rainfall 205.6 47.3 8 0 0 18 141.8 231 63.5 22.5 16.9 48.5 66.93
  Total larvae 10.8 4.3 1.8 1.8 3.3 9.2 6.9 4.1 10.1 3.4 4.8 22.6 6.88
Kiamachiri Canal 1.4 0.1 0.4 1.1 2.0 2.8 4.9 3.7 1.7 3.0 1.3 1.4 1.99
  Marsh 1.1 0.5 1.2 2.7 2.7 1.8 1.3 4.2 4.0 2.5 2.2 2.0 2.18
  Rice field 2.1 1.3 1.7 1.4 1.8 7.9 4.5 7.3 8.6 9.8 3.0 6.2 4.64
  Temporary pool 1.9 2.0 1.8 0.9 0.2 3.2 0.6 6.9 2.8 2.4 1.7 0.7 2.09
  Water reservoir 0.2 0.0 1.3 0.0 - - 1.0 1.8 0.0 2.0 0.0 - 0.52
  Rainfall 181.8 74.8 28 8 1.6 71 96.2 136 47.5 21 1 13 56.66
  Total larvae 6.7 3.9 6.4 6.1 6.7 15.7 12.3 23.9 17.1 19.7 8.2 10.3 11.42
Murinduko Canal 2.5 2.8 4.9 4.9 17.9 8.0 3.4 1.8 2.9 3.9 4.9 8.9 5.58
  Marsh 2.3 5.7 6.8 3.9 8.2 27.1 9.4 7.9 3.9 4.2 6.6 8.5 7.86
  Rice field 2.1 3.8 11.3 6.1 12.0 16.3 6.9 5.1 4.1 6.9 7.4 11.2 7.77
  Rock pool 3.0 3.4 - - - - 13.0 9.5 3.5 - - - 2.70
  Stream pool 7.6 3.5 10.5 3.9 11.8 5.0 3.0 3.5 5.7 8.6 14.2 14.3 7.64
  Temporary pool 8.5 1.4 12.7 7.1 6.8 11.0 9.3 21.9 8.6 9.2 8.8 5.0 9.18
  Tree hole 0.0 0.0 0.0 - - - 0.0 0.0 0.8 9.0 - - 0.82
  Water reservoir 0.5 0.0 - - - - 0.0 8.7 9.0 0.0 0.0 0.0 1.51
  Rainfall 119 56 10 0 9 15 190 324 54 6 4 23 67.5
  Total larvae 26.5 20.6 46.2 25.9 56.7 67.4 45.0 58.4 38.5 41.8 41.9 47.9 43.06
  1. a- (Minus sign) indicates that no aquatic habitat was present