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Concentrations of intracellular and extracellular (free) amlno acids (IAA and FAA respectively) were determined during predation of prey-deplete and prey-replete Oxyrrhis marina on dead, Ndeplete and N-replete Dunaliella primolecta, and also during the growth of mixed populations of the 2 organisms over 7 d. Cultures were axenic. Dunaliella did not take up any of 20 FAA tested but Oxyrrhis took up (amongst others) methionine, leucine, valine, and alanine. Uptake of FAA by Oxyrrhis could contribute a significant proportion of nitrogen demand. The composition of FAA in media containing mixed populations differed depending on the nutrient status of both organisms but generally those amino acids present were those for which Oxyrrhis did not show an affinity, although levels of, in particular, alanine increased until Oxyrrhis became prey-deplete and then decreased. Glutamate, alanine, arginine, glutamine and serine (and taurine in Oxyrrhis) were the major components of IAA but the proportions varied over a wide range depending on the nutrient status of the organisms. The value of the glutamine/glutamate (GLN/GLU) ratio appeared consistent with the incorporation of NH; by the population, indicating assimilation by Dunaliella of NH: regenerated by Oxyrrhis which was not detected in the medium. Elevated GLN/GLU was also indicative of prey-replete Ox)/rrhis. However, the evelated levels of GLU, and correspondingly low GLN/GLU, in prey-deplete Oxyrrhis and during initial feeding, could mask the GLN/GLU of Dunaliella if the predator biomass was high. Both prey-deplete Oxyrrhis and N-deplete Dunaliella had GLN/GLU of ca 0.1.

marine ecology. progress series

Changes in intracellular and extracellular amino acids during the predation of the chlorophyte Dunaliella primolecta by the heterotrophic dinoflagellate Oxyrrhis marina and the use of the glutamine/glutamate ratio as an indicator of nutrient status in mixed populations