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Early evaluation of coastal nutrient over-enrichment: new procedures and indicators |
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| Authors: | Goberville Eric Beaugrand Grégory Sautour Benoit Tréguer Paul |
| Institution: | a Laboratoire d’Océanologie et de Géosciences, UMR CNRS 8187 (LOG), 28 avenue Foch, 62930 Wimereux, France b Université Bordeaux I - Laboratoire d’Océanographie Biologique UMR CNRS 5805, Rue du Pr Jolyet, 33120 Arcachon, France c Centre National de la Recherche Scientifique, Université des Sciences et Technologies de Lille - Lille 1, Laboratoire d’Océanologie et de Géosciences, UMR CNRS 8187 (LOG), 28 avenue Foch, 62930 Wimereux, France d Institut Universitaire Européen de la Mer UMS CNRS 3113, Université Européenne de Bretagne, Technopole Brest-Iroise, Place Nicolas Copernic, 29280 Plouzané, France |
| Abstract: | Recent studies have provided compelling evidence for an accelerated anthropogenic impact on coastal systems, resulting in intense inputs of materials and nutrients from the continent. This has led scientists and policymakers to encourage the implementation of monitoring programmes, which have resulted in the multiplicity of datasets. However surprisingly, only a few attempts have been made to couple observations with statistical and mathematical tools to detect, as soon as the data become available perturbations in coastal systems. Here, we propose new mathematical procedures to evaluate the state of a system, based on the building of relative reference state and indicators of nutrient over-enrichment. The techniques were tested in some French coastal systems using data from the programme SOMLIT. Applied to this dataset, the multivariate procedures rapidly identified and evaluated anthropogenic nutrient anomalies from the continent on three sites (Wimereux, Roscoff and Villefranche-sur-Mer) from 1997 onwards. |
| Keywords: | Monitoring Multivariate statistical analyses Indicators Nutrient over-enrichment SOMLIT Relative reference states |
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