title: Interannual changes in δ¹⁵N values in Fucus vesiculosus L.
abstract: The natural abundance of (15)N (δ(15)N) has been widely used to detect anthropogenically derived N loads in environmental impact studies. The present study involved retrospective analysis of subsamples of Fucus vesiculosus L. collected during a period of three years (2008-2010) from two sites: a control site, within a coastal reference area, and an area affected by the effluents of a marine land-based fish farm. The isotopic signal in different subsamples of the macroalgae thalli (tissue that has grown during the same period) varied depending on the age of the tissue. Moreover, the isotopic signal decreased significantly with the age of the frond to within a certain range. The δ(15)N of F. vesiculosus is temporally unstable; therefore, measurement of the δ(15)N of macroalgal tissues does not allow reliable retrospective biomonitoring of environmental pollution. Further knowledge about the growth and other biological aspects of this species is required.
authors.affiliation: Área de Ecología, Facultad de Biología, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain. Electronic address: carlosbrais.carballeira@usc.es.
authors.forename: Carlos
authors.initials: C
authors.lastname: Carballeira
authors.affiliation: Área de Ecología, Facultad de Biología, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
authors.forename: Ana
authors.initials: A
authors.lastname: Rey-Asensio
authors.affiliation: Área de Ecología, Facultad de Biología, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
authors.forename: Alejo
authors.initials: A
authors.lastname: Carballeira
mesh_terms: D000818:Animals; D004777:Environment; D004784:Environmental Monitoring / Q000379:methods; D004785:Environmental Pollutants / Q000032:analysis; D005399:Fishes; D044645:Fucus / Q000737:chemistry*; D005843:Geography; D009584:Nitrogen / Q000737:chemistry*; D009587:Nitrogen Isotopes / Q000032:analysis*; D012189:Retrospective Studies; D012624:Seaweed / Q000737:chemistry*; D013030:Spain; D013997:Time Factors
chemical_list: D004785:Environmental Pollutants; D009587:Nitrogen Isotopes; D009584:Nitrogen
keywords: Biomonitoring; Macroalgae; Nitrogen; Retrospective; Stable isotopes