ABOVE: Ants in Fiji nurture an epiphytic seedling in a symbiotic relationship built on specific gains and tradeoffs GUILLAUME CHOMICKI
The ant species Philidris nagasau and epiphytic plants in the Squamellaria genus have a complicated relationship. Together they form an obligate farming mutualism in which ant and plant require each other to survive. Ants fertilize the plants, disperse their seeds, and provide defense against herbivores. In turn, the plants produce food rich in sugars and amino acids.
Between 2014 and 2019, Guillaume Chomicki and colleagues studied what they call “nonhuman farmers” in rainforests on two Fijian islands to figure out the evolutionary tradeoffs that exist in this arrangement. They reported in PNAS on January 21 that “food rewards were 7.5-fold higher in plants cultivated in full sun than in plants cultivated in full shade.” Plants in full sun in turn received greater protection against herbivores. The researchers write in their ...
