A UGA study has found that monarch butterflies that migrate long distances have evolved larger and more elongated wings than their stationary cousins. These differences are consistent with traits known to enhance flight ability in other migratory species.
As part of a National Science Foundation and UGA-funded study, researchers in the Warnell School of Forestry and Natural Resources and the Odum School of Ecology examined the size and shape of monarchs from migratory and non-migratory populations.
Andy Davis, a Warnell doctoral candidate, and Sonia Altizer, an associate professor in the Odum School, compared migratory monarchs from the eastern and western U.S. to those that do not migrate in Hawaii, Costa Rica, South Florida and Puerto Rico. They also measured the wings of lab-grown monarchs to rule out environmental causes of differences in size and shape, and to demonstrate a genetic basis for variation in wing traits among individual monarchs. Altizer and Davis’ findings were recently published in the online edition of the scientific journal Evolution.
The findings in monarchs were consistent with previous studies comparing migratory and non-migratory birds, which indicate that the best shape for long-distance flight involves long wings with a narrow tip to reduce drag. The team also found that monarchs from the two migratory populations in the U.S. differed in body size, suggesting that each population adapted to migration in different ways. Larger bodies might help eastern monarchs, with their much longer migration, carry fat deposits to fuel the long journey and five-month overwintering period in Mexico.
Monarchs in eastern North America, famous for migrating the longest distances of any insect species in the world, face a number of threats, to the point that monarch migration is considered to be an “endangered phenomenon.”
Davis has published previous research indicating that female monarch butterflies are on a 30-year decline in the eastern U.S. Furthermore, monarchs from this population are prone to periodic population crashes from storms at the Mexican overwintering site. Although monarchs worldwide are not threatened, those with the larger wingspan are, according to Altizer.