Sphingidae Taxonomic Inventory

Creating a taxonomic e-science

Diel rhythms and sex differences in the locomotor activity of hawkmoths

Publication Type:Journal Article
Year of Publication:2017
Authors:G. T. Broadhead, Basu, T., von Arx, M., Raguso, R. A.
Journal:Journal of Experimental Biology
Volume:220
Start Page:1472
Pagination:1472-1480
Keywords:CALLING TIME, CIRCADIAN RHYTHMS, DIEL ACTIVITY, FLIGHT PERIOD, HYLES, MANDUCA, SEXUAL DIMORPHISM, SPHINGIDAE
Abstract:

"Circadian patterns of activity are considered ubiquitous and adaptive, and are often invoked as a mechanism for temporal niche partitioning. Yet, comparisons of rhythmic behavior in related animal species are uncommon. This is particularly true of Lepidoptera (butterflies and moths), in which studies of whole-animal patterns of behavior are far outweighed by examinations of tissue-specific molecular clocks. Here, we used a comparative approach to examine the circadian patterns of flight behavior in Manduca sexta and Hyles lineata [two distantly related species of hawkmoth (Sphingidae)]. By filming isolated, individual animals, we were able to examine rhythmic locomotor (flight) activity at the species level, as well as at the level of the individual sexes, and in the absence of interference from social interaction. Our results confirmed classic descriptions of strictly nocturnal behavior in M. sexta and demonstrated a dramatically different activity pattern in H. lineata. Furthermore, we showed distinct species and sex-specific differences in the maintenance of the endogenous rhythm under conditions of constant darkness. In both species, female activity peaked in advance of males whereas male activity coincided with periods of female sexual receptivity. This suggests a role for circadian patterns of locomotor activity in synchronizing periods of sexual receptivity between the sexes."

DOI:10.1242/jeb.143966
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith