Connexion utilisateur

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

TitreImpact of seaweed beachings on dynamics of δ(15)N isotopic signatures in marine macroalgae.
Type de publicationJournal Article
Year of Publication2015
AuteursLemesle, S, Mussio, I, Rusig, A-M, Menet-Nédélec, F, Claquin, P
JournalMar Pollut Bull
Date Published2015 Jun 18
ISSN1879-3363
Résumé

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.

DOI10.1016/j.marpolbul.2015.06.010
Alternate JournalMar. Pollut. Bull.
Identifiant (ID) PubMed26095988