Floral CO2 reveals flower profitability to moths.

THOM C; GUERENSTEIN PG; MECHABER WL; HILDEBRAND JG

JOURNAL OF CHEMICAL ECOLOGY

SPRINGER

Lugar: Berlin; Año: 2004 vol. 30 p. 1285 - 1288

0098-0331

The hawkmoth Manduca sexta (Lepidoptera: Sphingidae), an experimentally favorable Lepidopteran that is highly sensitive to carbon dioxide (CO2), feeds on the nectar of a range of flowering plants, such as Datura wrightii (Solanaceae). Newly opened Datura flowers give off dramatically elevated levels of CO2 and offer ample nectar. Thus, floral CO2 emission could indicate food-source profitability. This study documents that foraging Manduca moths prefer surrogate flowers that emit high levels of CO2, characteristic of newly opened Datura flowers. We show for the first time that CO2 may play an important role in the foraging behavior of nectar-feeding insects.