Original: It is useful to distinguish between '' ecological selection '' and '' sexual selection '' . Ecological selection covers any mechanism of selection as a result of the environment ( including relatives , e.g. kin selection , competition , and infanticide ) , while '' sexual selection '' refers specifically to competition for mates .
Simplified: '' Since Darwinâ s days it has become clear that this kind of selection includes a far wider realm of phenomena , and instead of sexual selection it is better referred to as selection for reproductive success ... genuine selection , not elimination , is involved , unlike survival selection .