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Table 2 Effects of marker size, mosquito sex, number of swarming mosquitoes and number of released mosquitoes on swarm characteristics in An. coluzzii and An. gambiae in semi-field setups

From: Sex aggregation and species segregation cues in swarming mosquitoes: role of ground visual markers

  Marker size Species Sex No. of swarming mosquitoes
60 cm 100 cm χ2 df P-value An. coluzzii An. gambiae χ2 df P-value Female Male χ2 df P-value χ2 df P-value
Swarm dimension (± SE) (cm)
 Maximal 161.5 ± 4.8 181.6 ± 4.9 32.19 1 < 0.001 176.0 ± 4.2 167.2 ± 5.7 2.20 1 0.14 177.5 ± 3.1 161.8 ± 7.8 6.87 1 0.009 0.0047 1 0.95
 Nucleus 127.4 ± 5.5 153.6 ± 4.9 70.92 1 < 0.001 140.9 ± 4.5 140.4 ± 6.4 1.92 1 0.17 142.4 ± 3.5 137.7 ± 8.6 0.07 1 0.79 0.22 1 0.64
 Minimal 95.9 ± 6.1 122.6 ± 5.7 31.90 1 < 0.001 107.3 ± 5.6 111.5 ± 6.8 0.14 1 0.71 106.4 ± 4.8 114.3 ± 8.4 0.38 1 0.54 0.013 1 0.91
 Amplitude 65.6 ± 44.9 58.6 ± 3.8 2.81 1 0.09 68.3 ± 4.3 57.7 ± 3.9 3.40 1 0.06 71.1 ± 3.3 46.9 ± 4.5 11.46 1 < 0.001 0.19 1 0.67
 Width 45.3 ± 3.3 55.2 ± 3.4 0.018 1 0.89 51.3 ± 3.2 49.3 ± 3.6 0.35 1 0.55 49.5 ± 3.2 51.5 ± 3.6 1.29 1 0.26 5.3 1 0.021
Swarm sizea (± SE)
 No. of swarming mosquitoes 26.1 ± 2.6 42.8 ± 3.9 228.75 1 < 0.001 43.5 ± 3.7 25.3 ± 2.7 19.06 1 < 0.001 25.3 ± 2.1 49.4 ± 4.8 22.33 1 < 0.001 na na na
  1. aSwarm size expressed as the number of swarming mosquitoes
  2. Abbreviations: SE, standard error; na, not included in the analyses
  3. Note: Significant P-values are in bold