The wing pattern polyphenism found in many satyrine
butterflies in regions with wet-dry seasons, has been studied
in a laboratory stock of Bicyclus anynana that was established
from a large number of founders collected in Malawi.
Larvae reared at high (.23°C) or at low (,19°C) temperatures,
produce adults of the wet or dry season form, respectively,(15)
whereas variation in photoperiod has no effect in this
tropical species