02178nas a2200253 4500008004100000245007600041210006900117300001400186490000800200520146700208653001701675653002201692653001801714653001801732653001001750653001201760653002201772653001501794100002001809700001301829700001601842700001701858856004901875 2017 eng d00aDiel rhythms and sex differences in the locomotor activity of hawkmoths0 aDiel rhythms and sex differences in the locomotor activity of ha a1472-14800 v2203 a

"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."

10aCALLING TIME10aCIRCADIAN RHYTHMS10aDIEL ACTIVITY10aFLIGHT PERIOD10aHYLES10aMANDUCA10aSEXUAL DIMORPHISM10aSPHINGIDAE1 aBroadhead, G.T.1 aBasu, T.1 avon Arx, M.1 aRaguso, R.A. uhttps://sphingidae.myspecies.info/node/22076