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Translocation of isotopically distinct macroalgae: a route to low-cost biomonitoring?

Gröcke, D.R.; Racionero-Gómez, B.; Marschalek, J.W.; Greenwell, H.C.

Translocation of isotopically distinct macroalgae: a route to low-cost biomonitoring? Thumbnail


B. Racionero-Gómez

J.W. Marschalek


Nitrogen stable isotope ratios (δ15N) in macroalgae are often used to identify sources of nitrogenous pollution in fluvial and estuarine settings. This approach assumes that the macroalgal δ15N is representative of the sources of the pollution averaged over a timespan in the order of days to weeks, but the preferential uptake of a particular nitrogen compound or potential for fractionation in the water column or during uptake and assimilation by the macroalgae could make this assumption invalid. Laboratory studies were therefore performed to investigate the uptake and assimilation of both nitrate and ammonium at a variety of concentrations using the vegetative (non-fertile) tips of the brown macroalgae, Fucus vesiculosus. Nitrate appeared to fractionate at high concentrations, and was found to be taken up more rapidly than ammonia; within 13 days, the macroalgae tips were in isotopic equilibrium with the nitrate solution at 500 μM. These experiments were complemented by an investigation involving the translocation of macroalgae collected from a site enriched in 15N relative to natural levels (Staithes, UK), to the River Tees, Middlesbrough (UK), a site depleted in 15N relative to natural levels. The nitrogen isotope signature shifted 50% within 7 days, with samples deployed nearer the surface subject to greater change. These findings suggest that the translocation of macroalgae with isotopically distinct signatures can be used as a rapid, cost-efficient method for nitrogen biomonitoring in estuarine environments.


Gröcke, D., Racionero-Gómez, B., Marschalek, J., & Greenwell, H. (2017). Translocation of isotopically distinct macroalgae: a route to low-cost biomonitoring?. Chemosphere, 184, 1175-1185.

Journal Article Type Article
Acceptance Date Jun 18, 2017
Online Publication Date Jun 19, 2017
Publication Date Oct 1, 2017
Deposit Date Jun 19, 2017
Publicly Available Date Jun 19, 2018
Journal Chemosphere
Print ISSN 0045-6535
Electronic ISSN 1879-1298
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 184
Pages 1175-1185


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