a1 The Marine Station, Millport
The seasonal changes in the body weight and composition of two common boreo-arctic species of cirripedes, Balanus balanoides and B. balanus have been followed.
At a constant size (age under constant growth conditions) the body weight is closely related to the season. Increase in body weight takes place rapidly during the spring as reserves are laid down. These reserves are subsequently utilized for gonadal development.
The changes in B. balanus are more gradual than in B. balanoides and probably reflect differences in the habitat conditions.
The reserves, although contributing to the gonads, are not themselves adequate for their total tissue.