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Table 2 Spatial and season distribution of melanic and normal forms of An. arabiensis collected form Khartoum State (Sudan) in 1998–1999 and 2004-2006

From: A genotypically distinct, melanic variant of Anopheles arabiensi s in Sudan is associated with arid environments

Study area Form Dry season (Oct 1998-June 1999) Rainy season (Jul-Sep 1998) Dry season (Oct-2004-Jun-2005) Rainy season (July-Sep 2005)
El Tries (Irrigated) Normal 118 (92.9%) 241 (97.6%) 230 (94.3%) 67 (78.8%)
Melanic 9 (7.1%) 6 (2.4%) 14 (5.7%) 18 (21.2%)
Total 127 247 244 85
El Mowailih (Dry-irrigated) Normal 49 (41.2) 312 (75.7%) 42 (16.1) 208 (66.5%)
Melanic 70 (57.8) 100 (24.3% 219 (83.9) 105 (33.5%)
Total 119 412 261 313
Elrawakeeb (Very dry) Normal - - - 2 (6.9%)
Melanic - - - 27 (93.1%)
  Total - - - 29