title: Dynamics of δ(15)N isotopic signatures of different intertidal macroalgal species: Assessment of bioindicators of N sources in coastal areas.
abstract: δ(15)N of annual (Ulva sp., Porphyra sp.) and perennial intertidal seaweed species (Chondrus crispus, Fucus sp.) collected on 17 sampling points along the French coast of the English Channel in 2012 and 2013 were assessed on their suitability as bioindicators of N pollution in coastal areas. A sine function applied for δ(15)N time series data showed for all the species the same seasonal trend with lowest δ(15)N values in April and highest in summer but with no significant interspecific differences of amplitude (α) and phase angle (ϕ). This model provides a useful tool for monitoring the inter-annual changes of N pollution. An interspecific variability of δ(15)N values was observed, probably due to their tolerance to emersion. An in vitro study for comparing the kinetic acquisition of the isotopic signal and N uptake mechanisms of each species underlined the influence of algal physiology on the δ(15)N interspecific variability.
authors.affiliation: Normandie Univ, UNICAEN, CNRS, BOREA, 14000 Caen, France; UMR BOREA, CNRS-7208, IRD-207, MNHN, UPMC, UNICAEN, Esplanade de la Paix, 14000 Caen, France.
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Lemesle
authors.affiliation: Normandie Univ, UNICAEN, CNRS, BOREA, 14000 Caen, France; UMR BOREA, CNRS-7208, IRD-207, MNHN, UPMC, UNICAEN, Esplanade de la Paix, 14000 Caen, France.
authors.forename: Alexandre
authors.initials: A
authors.lastname: Erraud
authors.affiliation: Normandie Univ, UNICAEN, CNRS, BOREA, 14000 Caen, France; UMR BOREA, CNRS-7208, IRD-207, MNHN, UPMC, UNICAEN, Esplanade de la Paix, 14000 Caen, France. Electronic address: isabelle.mussio@unicaen.fr.
authors.forename: Isabelle
authors.initials: I
authors.lastname: Mussio
authors.affiliation: Normandie Univ, UNICAEN, CNRS, BOREA, 14000 Caen, France; UMR BOREA, CNRS-7208, IRD-207, MNHN, UPMC, UNICAEN, Esplanade de la Paix, 14000 Caen, France.
authors.forename: Anne-Marie
authors.initials: AM
authors.lastname: Rusig
authors.affiliation: Normandie Univ, UNICAEN, CNRS, BOREA, 14000 Caen, France; UMR BOREA, CNRS-7208, IRD-207, MNHN, UPMC, UNICAEN, Esplanade de la Paix, 14000 Caen, France.
authors.forename: Pascal
authors.initials: P
authors.lastname: Claquin
mesh_terms: D004784:Environmental Monitoring / Q000379:methods; D005602:France; D044645:Fucus / Q000378:metabolism; D008386:Marine Biology / Q000379:methods; D009566:Nitrates / Q000378:metabolism; D009584:Nitrogen / Q000032:analysis; D009587:Nitrogen Isotopes / Q000032:analysis*; D044664:Porphyra / Q000378:metabolism; D012621:Seasons; D012624:Seaweed / Q000378:metabolism*; D062211:Spatio-Temporal Analysis; D013045:Species Specificity; D044445:Ulva / Q000378:metabolism
chemical_list: D009566:Nitrates; D009587:Nitrogen Isotopes; D009584:Nitrogen
keywords: Biomonitoring; Nitrogen pollution; Nitrogen uptake; Nutrient enrichment; Seaweeds; δ(15)N interspecific variability