Reduced Cuticular Hydrocarbon Production in a Unicolonial Population of the Ant, Nylanderia fulva, Is Associated with Low Desiccation Resistance in its Invasive Range.

Cuticular hydrocarbons (CHCs) are ubiquitous among insects where they form an outer wax layer that helps maintain water balance and prevent desiccation. In social insects, CHCs were subsequently co-opted as semiochemicals in many contexts, including nestmate recognition, which maintains boundaries among competing colonies by ousting non-nestmates. In some ant populations, workers do not discriminate against non-nestmates. This leads to the development of supercolonies, a large network of interconnected nests exchanging unrelated individuals. In this study, we investigate CHC production by workers and their resistance to desiccation in the ant Nylanderia fulva, which exhibits supercolonial behavior within its invasive range in the USA. We found reduced CHC production by workers and increased susceptibility toward desiccation compared to other invasive ants of similar body size. This CHC-poor chemical profile sheds light on the susceptibility of this species to abiotic stress through desiccation with implications for its potential distribution and its development of large supercolonies in its invasive range by impairing nestmate recognition.