Faster (or slower) developers have a shorter (or longer) circadian period in Bactrocera cucurbitae

Abstract

A clock controlling circadian rhythm may relate to another clock controlling development time. The relationship between the two clocks remains open to discussion. Genetic correlation between developmental and circadian periods is observed in two Dipteran species (Bactrocera cucurbitae and Drosophila melanogaster), whereas it is not observed in a Coleopteran species (Callosobruchus chinensis). No studies, however, are available that report on the phenotypic correlation between the two traits. In the present study, free-running circadian periods are compared between individuals that develop fastest and slowest within a population of B. cucurbitae. The measurement of circadian periods is replicated using five populations of B. cucurbitae with different geographical and rearing histories. The results demonstrate that the flies developing more slowly have significantly longer circadian periods compared with the flies developing more quickly in two of five populations examined in B. cucurbitae, and thus the phenotypic correlation is dependent on population.

Pace‐of‐life: Relationships among locomotor activity, life history, and circadian rhythm in the assassin bug,Amphibolus venator

“…The individual differences in free-running period (length) of circadian rhythm have been reported within populations of the African grass rat, Arvicanthis niloticus (Blanchong, McElhinny, Mahoney, & Smale, 1999), and the fall field cricket, Gryllus pennsylvanicus (Bertram, Harrison, Thomson, & Fitzsimmons, 2013). Moreover, free-running period of circadian rhythms is often correlated with other life history traits in some insects (Kyriacou, Oldroyd, Wood, Sharp, & Hill, 1990;Miyatake, 2002Miyatake, , 2017. For example, strains of the melon fly Bactrocera cucurbitae artificially selected for a shorter developmental period had shorter free-running periods of circadian rhythm than did strains selected for a longer developmental period (Shimizu, Miyatake, Watari, & Arai, 1997).…”

Population-, sex- and individual level divergence in life-history and activity patterns in an annual killifish

“…Several researchers have suggested to include diurnal activity as a trait in POLS. Their case is supported by the fact that individuals or populations might differ consistently in diurnal activity change (see Alós, Martorell-Barceló & Campos-Candela, 2017) and that diurnal activity change is often correlated with life-history traits (Miyatake, 2017; Matsumura, Ryohei & Miyatake, 2019). Furthermore, such changes can impact fitness by mediating, for instance, reproductive success (Beaver et al, 2002; Yerushalmi & Green, 2009), Finally, if not a consequence of POLS, consistent individual differences in diurnal activity pattern seem unlikely as it would be more beneficial to adjust activity patterns in response to the situation at hand (indefinite plasticity) or an ‘optimal’ diurnal activity pattern would be universally selected for.…”