Impact of seaweed beachings on dynamics of delta N-15 isotopic signatures in marine macroalgae

作者：Lemesle Stephanie; Mussio Isabelle^*; Rusig Anne Marie; Menet Nedelec Florence; Claquin Pascal

来源：Marine Pollution Bulletin, 2015, 97(1-2): 241-254.

DOI：10.1016/j.marpolbul.2015.06.010

• Macroalgae
• delta N-15
• Tissue-N
• Seasonality
• English Channel
• Bay of Seine

A fine-scale survey of delta N-15, delta C-13, 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 delta N-15 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. delta N-15 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.

• 出版日期2015-8-15