Dernière mise à jour le : 8 février 2017

Seasonal phenology and metabolomics of the introduced red macroalga Gracilaria vermiculophylla, monitored in the Bay of Brest (France)


Seaweeds represent one of the largest groups of marine aliens in Europe and constitute a large percentage of all introduced marine species. In Brittany, the red macroalga Gracilaria vermiculophylla has invaded the bare areas of brackish waters in saltmarshes. In the Bay of Brest, the alga forms dense monospecific mats on the mud surface and occupies an empty ecological niche, in association with the invasive halophyte, Spartina alterniflora. The phenology of G. vermiculophylla was studied through seasonal monitoring of biomass, density and size of fragments, complemented by metabolomic monitoring using 1H HR-MAS NMR chemical footprinting analyses. Moreover, lipids and pigments were quantified, using high-performance thin layer chromatography for the former and high-performance liquid chromatography and spectrophotometry for the latter. This rhodophyte is present throughout the year, never fixed to a substrate on the mud, with a maximum biomass in the summertime. Phenological observations on algal populations demonstrated a high capacity for fragmentation, with a majority of fragments shorter than 3 cm. Metabolomic analyses highlighted a temporal variability of lipids, pigments and osmolytes between seasons. These results, combined with ecological data, improve our understanding of the acclimation of G. vermiculophylla in Brittany, where it is mainly present in a vegetative state throughout the year. Our study represents an important contribution to understanding the ecological strategies used by this invasive seaweed to colonize and persist in the Bay of Brest.


keyboard_arrow_right Titre : Seasonal phenology and metabolomics of the introduced red macroalga Gracilaria vermiculophylla, monitored in the Bay of Brest (France)
keyboard_arrow_right Type de documentation : Articles
keyboard_arrow_right Auteur(s) personne(s) : Stiger-Pouvreau Valérie, Poupart Nathalie, Bihannic Isabelle, Poullaouec Marie-Aude, Donval Anne, Kervarec Nelly, Delebecq Gaspard, Lann Klervi Le, Surget Gwladys
keyboard_arrow_right Date de publication : 8 février 2017
keyboard_arrow_right Nombre de pages : pp1-16
keyboard_arrow_right Editeur(s) : Springer
keyboard_arrow_right Tags thématiques : algue, prolifération d'algues, introduction d'espèces végétales étrangères, marée rouge, peuplement (biologique)
keyboard_arrow_right Mots-clés libres : algue invasive/algues/algues invasives/Gracilaria vermiculophylla/HR-MAS NMR/Invasive seaweed/Lipid class/Osmolyte/plante invasives/Plantes invasives/Population biology/rade de Brest
keyboard_arrow_right Langue : Anglais
keyboard_arrow_right N° d'édition (ISBN,DOI...) : 10.1007/s10811-017-1060-3
keyboard_arrow_right Collection : Journal of applied phycology
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