Population genetics in the American tropics : XI. Seasonal and temporal variations in relative frequencies of species belonging to the Willistoni group in Colombia.

The authors examined seasonal and plant food preferences of members of Drosophila willistoni group in three different ecosystems in Colombia. The results show that there are seasonal preferences as well as food preferences. Furthermore, there exist clear cut temporal (hours of the day) selection which would make possible the sympatric exploitation of equal ecological niches. Comparisons with melanogaster species and with obscura species group are also made.