Answer:
The answer is directional selection.
Explanation:
Selection types can be given as stabilizing, disruptive and directional selection and the example given in the question is an example of directional selection.
In directional selection, the phenotypes of the species take role in determining their chances of survival and in this situation the one will have the advantage over the other species in terms of survival because they were initially living in different conditions therefore they will experience directional selection but in opposite directions meaning one will have a positive impact and the other negative.
I hope this answer helps.