1 Introduction

Figure 1.1 shows the experimental setup in an isolated region next to a dam in the Nile River in the Northern State, in the Merowe area.

The region comprises 3 distinct areas: the East bank of the river (located to the West, due to a meander), the inner Island and the West bank. In each area, 3 sectors were delimited, so that they were separated by natural barriers and that contained all types of land-class-land-use (LCLU) categories.

The region was partitioned with a square grid of 1-hectare in size and 94 units were sampled approximatively in proportion to the LCLU relative surface.

3 adult traps were installed in each sampling unit.

Furthermore, whenever a breeding site was noticed during adult trap surveys, an additional survey of larvae was conducted in the site.

Finally, following some of the releases of sterile males in the test sector, a survey of swarms was performed.

2 Adult surveys

A total of 8669 trap surveys were recorded from 2014-05-22 to 2017-04-22.

96 % of these surveys resulted in 0 Anopheles arabiensis catched.

The total number of catches by sector type and area is displayed in Figure 2.1.

Figure 2.1: Total number of catched adults by sex and species in each sector type and area.

3 Larvae surveys

A total of 122 larvae surveys were recorded from 2014-05-29 to 2017-04-22. But some areas have been more surveyed than others, presumably because more breeding sites were found. Figure 3.1 displays the average ratio of larvae per dip in each area (sit sector apart).

Figure 3.1: Number of larvae per dip by sector type and study area. Size of points proportional to the total number of surveys.

4 Swarm surveys

A total of 13 swarmings were recorded from 2015-01-16 to 2017-02-15, following some of the releases of sterile males in the sit sector.

Figure 4.1 shows the number of sterile and wild males catched during each of these swarming events.

Figure 4.1: Number of sterile and wild males catched by swarming event.