High congruence of isotope sewage signals in multiple marine taxa |
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| Institution: | 1. Institute of Oceanology, Polish Academy of Sciences, Powstańców Warszawy 55, 81-712 Sopot, Poland;2. Centre for Polar Studies, Leading National Research Centre, Będzińska 60, 41-200 Sosnowiec, Poland;3. Institute of Geological Sciences, Jagiellonian University, Oleandry 2A, 30-063 Kraków, Poland;1. Aquatic Ecology Group, Ludwig Maximilian University of Munich (LMU), Grosshadernerstr. 2, 82152 Planegg-Martinsried, Germany;2. Faculty of Biosciences and Aquaculture, University of Nordland, N-8049 Bodø, Norway;1. Muséum National d''Histoire Naturelle (MNHN), Centre de Recherche et d''Enseignement sur les Systèmes Côtiers (CRESCO), Station Marine de Dinard, 38 rue du port blanc, 35800 Dinard, France;2. Association Planète Mer, 137 avenue Clôt Bey, 13008 Marseille, France;3. Université de Rennes 1, Unité Biologie des Organismes et Ecosystèmes Aquatiques (BOREA UMR 7208), Muséum National d''Histoire Naturelle, Sorbonne Universités, Université de Caen Normandie, Université desAntilles, CNRS, IRD, Campus de Beaulieu, 35042 Rennes Cedex, France;4. Unité Biologie des Organismes et Ecosystèmes Aquatiques (BOREA UMR 7208), Muséum National d''Histoire Naturelle, Sorbonne Universités, Université de Caen Normandie, Université desAntilles, CNRS, IRD, Station Marine de Dinard, 38 rue du port blanc, 35800 Dinard, France;5. Department of Evolution, Ecology and Behaviour, University of Liverpool, Liverpool L69 7ZB, UK;1. Department of Biology, Acadia University, Wolfville, NS B4P 2R6, Canada;2. Wildlife Research Division, Environment Canada, 6 Bruce Street, Mount Pearl, NL, A1N 4T3, Canada |
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| Abstract: | Assessments of sewage pollution routinely employ stable nitrogen isotope analysis (δ15N) in biota, but multiple taxa are rarely used. This single species focus leads to underreporting of whether derived spatial N patterns are consistent. Here we test the question of ‘reproducibility’, incorporating ‘taxonomic replication’ in the measurement of δ15N gradients in algae, seagrasses, crabs and fish with distance from a sewage outfall on the Adelaide coast (southern Australia). Isotopic sewage signals were equally strong in all taxa and declined at the same rate. This congruence amongst taxa has not been reported previously. It implies that sewage-N propagates to fish via a tight spatial coupling between production and consumption processes, resulting from limited animal movement that closely preserves the spatial pollution imprint. In situations such as this where consumers mirror pollution signals of primary producers, analyses of higher trophic levels will capture a broader ambit of ecological effects. |
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| Keywords: | Sewage Nitrogen isotopes Monitoring Spatial gradients Coastal waters |
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