Abstract
One Tree Reef lagoon is surrounded by an emergent rim which restricts exchange between lagoonal waters and the surrounding ocean. For this reason, the loss rate of dissolved inorganic nitrogen (DIN) through mixing processes is slow in the central lagoon compared to rates of advective input, uptake, regeneration and loss to the atmosphere. We present some hypotheses concerning the importance of these fluxes to the observed patterns of concentration of nitrate+nitrite and ammonium. A scaling analysis of these fluxes indicates that the relative influence of advection across the windward reef crest on lagoonal concentrations changes with season and differs for the two forms of DIN. Advective flux, dominated by DIN derived from production on the algal pavements of the reef crest, is significant in controlling DIN concentration in the peripheral regions of the lagoon. Loss to the atmosphere is a more important flux from the nitrate+nitrite pool in the centre of the lagoon, particularly in summer. Regeneration is a significant input to the ammonium pool of the central lagoon in winter. The relative magnitudes of all fluxes are more similar to each other in the summer than the winter, indicating the potential for shifts in the dominance hierarchy at small time and space scales. One form of DIN in One Tree Reef lagoonal waters (nitrate+nitrite) is controlled by input and another (ammonium) by recycling as well as input. The relative importance of these fluxes changes as a result of temperature pertubations at the physiological level as well as the rate of water turnover at the “system” level. It is proposed that the degree of consistency of the seasonal concentration patterns is a function of the period, rather than the amplitude of the temporal oscillations in the fluxes controlling these concentrations. This has important implications for sampling strategies. This paper provides a conceptual framework for hypothesis testing at a manageable scale, in the context of ecosystem function.
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Hatcher, A.I., Frith, C.A. The control of nitrate and ammonium concentrations in a coral reef lagoon. Coral Reefs 4, 101–110 (1985). https://doi.org/10.1007/BF00300868
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DOI: https://doi.org/10.1007/BF00300868