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Mar Pollut Bull. 2015 Aug 15;97(1-2):241-254. doi: 10.1016/j.marpolbul.2015.06.010. Epub 2015 Jun 19.

Impact of seaweed beachings on dynamics of δ(15)N isotopic signatures in marine macroalgae.

Author information

1
Normandie Université, Université de Caen Basse-Normandie, F-14032 Caen, France; UMR BOREA, CNRS-7208, IRD-207, MNHN, UPMC, UniCaen, Esplanade de la Paix, F-14032 Caen, France.
2
Normandie Université, Université de Caen Basse-Normandie, F-14032 Caen, France; UMR BOREA, CNRS-7208, IRD-207, MNHN, UPMC, UniCaen, Esplanade de la Paix, F-14032 Caen, France. Electronic address: isabelle.mussio@unicaen.fr.
3
IFREMER, Laboratoire Environnement Ressources de Normandie, Avenue du Général de Gaulle, 14520 Port-en-Bessin, France.

Abstract

A fine-scale survey of δ(15)N, δ(13)C, tissue-N in seaweeds was conducted using samples from 17 sampling points at two sites (Grandcamp-Maisy (GM), Courseulles/Mer (COU)) along the French coast of the English Channel in 2012 and 2013. Partial triadic analysis was performed on the parameter data sets and revealed the functioning of three areas: one estuary (EstA) and two rocky areas (GM(∗), COU(∗)). In contrast to oceanic and anthropogenic reference points similar temporal dynamics characterized δ(15)N signatures and N contents at GM(∗) and COU(∗). Nutrient dynamics were similar: the N-concentrations in seawater originated from the River Seine and local coastal rivers while P-concentrations mainly from these local rivers. δ(15)N at GM(∗) were linked to turbidity suggesting inputs of autochthonous organic matter from large-scale summer seaweed beachings made up of a mixture of Rhodophyta, Phaeophyta and Chlorophyta species. This study highlights the coupling between seaweed beachings and nitrogen sources of intertidal macroalgae.

KEYWORDS:

Bay of Seine; English Channel; Macroalgae; Seasonality; Tissue-N; δ(15)N

PMID:
26095988
DOI:
10.1016/j.marpolbul.2015.06.010
[Indexed for MEDLINE]

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