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Sediment-water exchange of dissolved nutrients at an intertidal site in the upper reaches of the Bay of Fundy

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Abstract

Concentrations of dissolved nitrate, silicate, and phosphate in water flooding intertidal sediments at Pecks Cove and along the axis of Cumberland Basin, Bay of Fundy were measured throughout the year. Exchanges of dissolved nutrients between intertidal sediments and overlying water were measured by enclosing water in chambers over undisturbed sediment. Nitrate concentrations in the water usually decreased during incubations while silicate was released by sediments during summer and consumed during fall. Particles which settled in sediment traps exposed during periods of high tide were stirred in filtered seawater to measure nutrient exchange. The flux of nutrients between the intertidal sediments and settled particles and seawater was estimated from incubation experiments and the observed nitrogen content in surface sediments and suspended particulate material. There was a net import of dissolved nitrate and silicate into Cumberland Basin from Chignecto Bay during early summer, at all other times there was a net export. Despite the low primary productivity and rigorous physical environment, biological activity has a measurable impact on dissolved nutrient concentrations in the waters of Cumberland Basin.

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Keizer, P.D., Hargrave, B.T. & Gordon, D.C. Sediment-water exchange of dissolved nutrients at an intertidal site in the upper reaches of the Bay of Fundy. Estuaries 12, 1–12 (1989). https://doi.org/10.2307/1351444

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