An Energy Budget for Individual Barnacles (Balanus glandula)

An annual energy budget was constructed for individual adult barnacles (Balanus glandula Darwin) for the first year after settlement. The production of body tissue, egg, shell, aquatic and aerial respiration, molting and faecal production was determined and consumption was derived from the summation of these budget items. To provide an estimation of the accuracy of the budget equation, energy budgets were constructed for three small groups of barnacles (n = 40) kept under laboratory conditions, in which the budget items, including consumption, were determined independently.