Table 1.
Regression analysis of swarm start and stop times against environmental parameters based on Pearson’s Correlation Coefficient test (two-tailed distribution)
| |
An. coluzzi |
An. gambiae s.s. |
|
||
|---|---|---|---|---|---|
| r | p | r | p | df = n-2 | |
|
Start swarm | |||||
| Temperature |
0.0640 |
0.3233 |
0.1694 |
0.0085 |
238& |
| Humidity |
0.4452 |
< 0.0001 |
0.2837 |
< 0.0001 |
238& |
| Light intensity |
0.1345 |
0.0373 |
0.0412 |
0.5250 |
238& |
| Time of sunset |
0.9606 |
< 0.0001 |
0.9481 |
< 0.0001 |
498* |
|
End swarm | |||||
| Temperature |
0.0735 |
0.2568 |
0.2731 |
< 0.0001 |
238& |
| Humidity |
0.2445 |
<0.001 |
0.1543 |
0.0168 |
238& |
| Light intensity |
0.1187 |
0.0663 |
0.3592 |
< 0.0001 |
238& |
| Time of sunset | 0.9469 | < 0.0001 | 0.9621 | < 0.0001 | 398# |
The correlation (r) between each environmental variate in turn against swarm start and end times for each species; 'p’ = probability of no correlation, sample size for each species n = 240 records each of temperature, humidity and light intensity at the start and at the end of swarms (&20/month/species for 12 months, 2007), n = 500 records of sunset times for start of swarms (*20/month/species for 25 months over 4 years), and n = 400 records of sunset times for the end of swarms (#20/month/species for 20 months over 3 years). NB: swarm end times were not recorded in 2009.