Publications des scientifiques de l'IRD

Cadier M., Gorgues Thomas, Lhelguen S., Sourisseau M., Memery L. (2017). Tidal cycle control of biogeochemical and ecological properties of a macrotidal ecosystem. Geophysical Research Letters, 44 (16), p. 8453-8462. ISSN 0094-8276.

Titre du document
Tidal cycle control of biogeochemical and ecological properties of a macrotidal ecosystem
Année de publication
2017
Type de document
Article référencé dans le Web of Science WOS:000410658800043
Auteurs
Cadier M., Gorgues Thomas, Lhelguen S., Sourisseau M., Memery L.
Source
Geophysical Research Letters, 2017, 44 (16), p. 8453-8462 ISSN 0094-8276
In some regions, tidal energy can be a key factor in the generation of variability in physical and biogeochemical properties throughout the water column. We use a numerical model resolving tidal cycles and simulating diversity in phytoplankton to assess the impact of tidal mixing on vertical stability and phytoplankton community (total biomass and diversity) in a macrotidal sea (Iroise Sea, France). Two different time scales have been considered: semidiurnal and spring/neap tidal cycles. Our results show that the latter is the one primarily influencing the phytoplankton growth conditions by modifying the vertical stratification. During spring tide, the growth is rather light limited, whereas neap tide conditions lead to vertical stabilization and better light conditions in the shallow surface layer. The transition from high to low tidal mixing conditions is thus associated with a total phytoplankton biomass increase (caused by the rapid development of fast-growing diatoms) and reduced phytoplankton diversity.
Plan de classement
Limnologie physique / Océanographie physique [032] ; Ecologie, systèmes aquatiques [036]
Description Géographique
FRANCE ; BRETAGNE ; IROISE MER
Localisation
Fonds IRD [F B010071023]
Identifiant IRD
fdi:010071023
Contact