The different reproductive strategies of males and females underlie differences in behavior that may also lead to differences in nutrient use between the two sexes. We study sex differences in the utilization of two essential amino acids (EAAs) and one non-essential amino-acid (NEAA) by the Carolina sphinx moth (Manduca sexta). On day one post-eclosion from the pupae, adult male moths oxidized greater amounts of larval-derived AAs than females, and more nectar derived AAs after feeding. After four days of starvation the opposite pattern was observed; adult females oxidized more larval-derived AAs than males. Adult males allocated comparatively small amounts of nectar-derived amino acids to their first spermatophore, but this allocation increased substantially in the second and third spermatophores. Males allocated significantly more adult derived AAs to their flight muscle than females. These outcomes indicate that adult male and female moths employ different strategies for allocation and oxidation of dietary AAs.
- Received January 2, 2017.
- Accepted May 8, 2017.
- © 2017. Published by The Company of Biologists Ltd