- Birth environment.

- Coordinates of release into the wild environment.

These two differences alone are already enough to represent a selection pressure. A mosquito pair which is fortunate enough to have a statistical deviance in its position relative to a released population of sterile mosquitos will tend to reproduce more often than others. We absolutely expect that a pressure will exist. We absolutely expect that a selection will take place.

Assuming that the selected feature will be one which corresponds with detecting a difference between sterile and non-sterile mosquitos might be a stretch though. There is an enormous space of potential features which might be selected for. For example, mating multiple times to increase the chance of being with a fertile mate is another possible selection. Another is flying away from regions with large numbers of mosquitos which are appear to be newly introduced to the environment. Another is that mosquitos which exist in hazardous environments which usually kill mosquito possess unique adaptions which may prevent the sterile mosquitos from hindering their reproduction. The space of possibility is too large to enumerate.