When a typical sophisticated reproductive strategy is used, only females are present in the population at the beginning of the seasonal cycle (although a few species of aphids have been found to have both male and female sexes at this time).
Cando se usa unha estratexia reprodutiva sofisticada, a poboación só ten femias ao principio do ciclo estacional (aínda que se atoparon poucas especies de áfidos que teñan tanto machos coma femias).