Abstract
The present study was designed to measure the relative turnover of nitrogen and phosphorus during a standard period of metabolism among several co-occurring species of benthic invertebrates: chitons (Poneroplax albida Blainville 1825); albalones (Haliotis roei Gray, 1826); gastropods [Turbo (ninella) torquatus Gmelin, 1791]; ascidians [Herdmania momus (Savigny)]; and sponges (Aplysina sp. and Iotrochata baculifera Ridley, 1884). Five of the six species (collected at Wreck Rock, Western Australia in 1985) exhibited a high turnover of phosphorus (P) relative to nitrogen (N). In contrast to N, P turnover was related to the concentration of P in body tissues. A relatively high demand for P in the diet is required to support the observed rapid turnover of P with respect to N. This observation suggests that the evaluation of potential foods would be better accomplished by the measurement of the C:P or the N:P ratio, rather than the commonly used C:N ratio.
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