Drosophila: Where the Wild Flies Are

Area of Science:

• Evolutionary biology
• Insect ecology
• Paleoanthropology

Background:

• Drosophila melanogaster is widely considered a human commensal and dietary generalist.
• Previous research has not fully explored the ecological niche of wild D. melanogaster in its ancestral range.

Purpose of the Study:

• To investigate the dietary specialization of wild Drosophila melanogaster in their ancestral African range.
• To understand the role of specific fruits, like marula, in the diet of wild fruit flies.

Main Methods:

• Field observations and sample collection in the ancestral range of D. melanogaster in Africa.
• Analysis of gut contents and stable isotopes to determine fruit fly diet.
• Archaeological context analysis of Pleistocene human cave sites.

Main Results:

• Wild Drosophila melanogaster in Africa exhibit a strong dietary specialization on marula fruit.
• Evidence suggests a long-standing association between fruit flies and marula fruit, potentially influenced by ancient human behavior.

Conclusions:

• Contrary to generalist assumptions, wild D. melanogaster populations can be highly specialized feeders.
• Pleistocene humans caching marula fruit in caves may have shaped the dietary ecology of D. melanogaster.