Table 3 Habitat dynamics, productivity and diversity of Anopheles larval habitats sampled over 12 months in three ecologically varied villages in the Mwea Rice Irrigation Scheme (April 2004 - March 2005)
Village | Habitat type | # Habitats sampled | % Larval habitats had water | # Sampled | % Larval habitats positive for Anopheles larvae | % Anopheles larvae alone | Larval density (no./10 dips) | Pupal density (no./10 dips) |
|---|---|---|---|---|---|---|---|---|
Mbui Njeru ("Planned" rice cultivation; >80% area under rice) | Canal | 19 | 83.0 | 225 | 31.6 | 13.7 | 1.1 | 0.0 |
| Â | Marsh | 6 | 19.5 | 17 | 47.1 | 21.2 | 1.7 | 0.2 |
| Â | Rice field | 80 | 57.6 | 545 | 46.8 | 28.4 | 2.2 | 0.4 |
| Â | Temporary pool | 96 | 14.4 | 374 | 36.1 | 30.5 | 2.4 | 0.2 |
| Â | Water reservoir | 2 | 23.1 | 6 | 16.7 | 5.7 | 0.4 | 5.6 |
Kiamachiri ("Unplanned" rice cultivation; ≈ 25% area under rice) | Canal | 30 | 62.7 | 330 | 39.7 | 16.6 | 1.9 | 0.2 |
| Â | Marsha | 27 | 48.3 | 193 | 48.7 | 18.3 | 2.1 | 0.3 |
| Â | Rice field | 108 | 52.7 | 749 | 56.3 | 35.2 | 4.1 | 0.2 |
| Â | Temporary poolb | 59 | 50.0 | 423 | 44.9 | 23.8 | 2.8 | 0.4 |
| Â | Water reservoirc | 2 | 46.2 | 24 | 25.0 | 5.8 | 0.7 | 0.7 |
Murinduko (Subsistence farming; < 5% area under rice on valley bottoms) | Canal | 9 | 97.1 | 133 | 65.4 | 12.4 | 6.7 | 0.7 |
| Â | Marsh | 22 | 85.7 | 162 | 79.6 | 14.5 | 7.8 | 2.7 |
| Â | Rice field | 83 | 86.4 | 1126 | 69.3 | 16.3 | 8.8 | 0.7 |
| Â | Rock pool | 4 | 35.5 | 11 | 72.7 | 10.9 | 5.9 | 15.9 |
| Â | Stream pool | 10 | 93.9 | 108 | 76.9 | 15.8 | 8.5 | 0.6 |
| Â | Temporary pools | 35 | 90.7 | 234 | 76.9 | 18.3 | 9.9 | 0.6 |
| Â | Tree hole | 3 | 44.4 | 4 | 75.0 | 5.3 | 2.9 | 3.8 |
| Â | Water reservoir | 4 | 61.1 | 21 | 28.6 | 6.3 | 3.4 | 21.6 |