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Type: Journal article
Title: The use of δ15N signatures of translocated macroalgae to map coastal nutrient plumes: improving species selection and spatial analysis of metropolitan datasets
Other Titles: The use of (Delta)15N signatures of translocated macroalgae to map coastal nutrient plumes: Improving species selection and spatial analysis of metropolitan datasets
Author: Fernandes, Milena
Benger, Simon
Sharma, S. K.
Gaylard, Samuel
Kildea, Timothy Nicolas
Hoare, Sonja L.
Braley, Michelle
Irving, Andrew D.
Citation: Journal of Environmental Monitoring, 2012; 14(9):2399-2410
Publisher: Royal Society of Chemistry
Issue Date: 2012
ISSN: 1464-0325
School/Discipline: School of Earth and Environmental Sciences
Statement of
M. Fernandes, S. Benger, S. K. Sharma, S. Gaylard, T. Kildea, S. Hoare, M. Braley and A. D. Irving
Abstract: The definition of the spatial footprint of land-derived nutrient plumes is a key element to the design of initiatives to combat eutrophication in urbanised coastal regions. These plumes, however, are difficult to monitor because of their inherent high-frequency temporal and spatial variability. Biomonitoring with macroalgae provides time-integration of bioavailable nitrogen inputs through the measurement of δ¹⁵N signatures in tissues, and adequate spatial coverage through translocation to desirable monitoring locations. In this study, we used laboratory incubations to compare three different species of macroalgae as bioindicators, and a field experiment to investigate the applicability of the technique for the large-scale mapping of nutrient plumes. Cladophora valonioides was selected for the field experiment as it showed rapid changes in δ¹⁵N values in the laboratory incubations, was abundant in shallow depths making collection cost-efficient, and had tough thalli capable of withstanding deployment in open water. Ecklonia radiata also performed well in the laboratory incubations, but field harvest from subtidal depths was comparatively more expensive. Ulva lactuca had fragile thalli, and large nitrogen reserves that acted to mask the isotopic signal of newly acquired nitrogen. Cladophora valonioides was translocated to 246 sites covering an area of ~445 km² along the highly urbanized temperate coast of Adelaide, South Australia. The resulting isotopic signatures of nitrogen in tissues were spatially interpolated to produce maps of land-derived nutrient plumes, to model probability and standard error in the predictive surface, and to optimize sampling design.
Rights: © The Royal Society of Chemistry 2012
DOI: 10.1039/c2em10997b
Appears in Collections:Earth and Environmental Sciences publications

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