Table 2 Characteristics of water and distribution of invertebrates along the transects obtained during larval surveys.
Variables | Distance from landward edge | P | |
|---|---|---|---|
|  | 0–100 m n = 140 | 200–500 m n = 415 |  |
aDepth (cm) | 9.0 (8.4–9.7) | 10.7 (10.1–11.2) | 0.001 |
aTurbidity (ntu) | 107.9 (86.9–133.9) | 129.0 (120.8–137.8) | ns |
bpH | 7.0 (6.8–7.3) | 7.6 (7.5–7.7) | <0.001 |
aConductivity (mS/cm) | 1.0 (0.9–1.2) | 2.5 (2.3–2.7) | <0.001 |
aTemperature°C | 30.2 (29.8–30.6) | 28.6 (28.3–28.9) | <0.001 |
Oxygen content units (mg/L) | 5.6 (5.2–6.1) | 6.0 (5.8–6.2) | ns |
Presence of moving water (%) | 4.3% | 99.0% | <0.001 |
Height of rice (cm) | 17.0 (12.9–21.1) | 39.1 (35.5–42.7) | <0.001 |
Cow dung samples/site | 132 | 33 | <0.001 |
| Â | N = 638 | N = 802 | Â |
Total anopheline larvae (proportion of occasions trapped) | 349 (58/638) | 26 (13/789) | <0.001 |
Anopheles gambiae s.l. | 66 (19/638) | 14 (9/802) | 0.011 |
Anopheles gambiae s.s. | 15 (3/638) | 8 (2/802) | ns |
Anopheles arabiensis | 30 (6/638) | 6 (2/802) | ns |
Anopheles melas | 21 (4/638) | 0 (0/802) | 0.038 |
Culicine larvae | 423 (53/638) | 19 (7/802) | <0.001 |
Other aquatic insects | 912 (19/638) | 532 (9/802) | <0.001 |
Mean no. invertebrate taxa, excluding mosquitoes | 3.1 (2.6–3.6) | 0.9 (0.8–1.0) | <0.001 |
Mean no. fish species/sample | 0 | 1.19 (0.68–1.59) |  |