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Variable rates of phosphate uptake by shallow marine carbonate sediments: Mechanisms and ecological significance

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Abstract

We determined phosphate uptake by calcareous sediments at two locations within a shallow lagoon in Bermuda that varied in trophic status, with one site being mesotrophic and the other being more eutrophic. Phosphate adsorption over a six hour period was significantly faster in sediments from the mesotrophic site. Uptake at both sites was significantly less than that reported for a similar experiment on calcareous sediments in an oligotrophic lagoon in the Bahamas. The difference in phosphorus adsorption between our sites did not appear to be related to sediment characteristics often cited as important, such as differences in surface area (as inferred from grain size distributions), total organic matter content, or iron content. However, the sediment total phosphorus contents were inversely related to phosphorus uptake at our sites in Bermuda, and at the previously studied Bahamas site.

We hypothesize that phosphate uptake in these calcareous sediments is a multi-step process, as previously described for fluvial sediments or pure calcium carbonate solids, with rapid initial surface chemisorption followed by a slower incorporation into the carbonate solid-phase matrix. Accordingly, sediments already richer in solid phase phosphorus take up additional phosphate more slowly since the slower incorporation of surface-adsorbed phosphate into the carbonate matrix limits the rate of renewal of surface-reactive adsorption sites.

Although carbonate sediments are a sink for phosphate, and thereby reduce the availability of phosphorus for benthic macrophytes and phytoplankton in the shallow overlying water, phosphate uptake by these sediments appears to decrease along a gradient from oligotrophic to eutrophic sites. If our result is general, it implies a positive feedback in phosphorus availability, with a proportionately greater percentage of phosphorus loading being biologically available longer as phosphorus loading increases. This pattern is supported by the significantly higher tissue phosphorus content of the seagrass,Thalassia testudinum, collected from the eutrophic inner bay site. Over time, this effect may tend to cause a shift from phosphorus to nitrogen limitation in some calcareous marine environments.

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  1. Karen J. McGlathery

    Present address: Department of Freshwater Ecology, National Environmental Research Institute, Vejlsøvej, 25, DK-8600, Denmark

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  1. Section of Ecology and Systematics, Division of Biological Sciences, Corson Hall, Cornell University, Ithaca, NY, 14853-2701, USA

    Karen J. McGlathery, Roxanne Marino & Robert W. Howarth

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  1. Karen J. McGlathery
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McGlathery, K.J., Marino, R. & Howarth, R.W. Variable rates of phosphate uptake by shallow marine carbonate sediments: Mechanisms and ecological significance. Biogeochemistry 25, 127–146 (1994). https://doi.org/10.1007/BF00000882

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