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Typology of environmental conditions at the onset of winter phytoplankton blooms in a shallow macrotidal coastal ecosystem, Arcachon Bay (France) ArchiMer
Gle, C; Del Amo, Y; Bec, B; Sautour, B; Froidefond, J; Gohin, Francis; Maurer, Daniele; Plus, Martin; Laborde, P; Chardy, P.
Phytoplankton dynamics were assessed in the macrotidal ecosystem of Arcachon Bay through high-frequency surveys over a 5-year period in order to characterize typology of environmental conditions at the onset of the productive period. Temporal variations of hydrological and biological parameters were examined in external and internal waters of the lagoon, during the winter-spring periods from 1999 to 2003. An additional survey was performed during winter-spring 2005 in order to study the vertical structure of the water column. The occurrence of winter phytoplankton blooms between January and March emerged as a recurrent event. The early onset of the productive period is influenced by the biological functioning of adjacent Bay of Biscay oceanic waters. It is...
Tipo: Text Palavras-chave: Macrotidal ecosystem; Phytoplankton inoculum; Onset; Winter blooms.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3513.pdf
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Tidal cycle control of biogeochemical and ecological properties of a macrotidal ecosystem ArchiMer
Cadier, Mathilde; Gorgues, Thomas; Lhelguen, Stephane; Sourisseau, Marc; Memery, Laurent.
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: semi-diurnal 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...
Tipo: Text Palavras-chave: Macrotidal ecosystem; Spring; Neap tidal cycle; Semidiurnal cycle; Phytoplankton communities; Diversity; Competition.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00395/50612/51325.pdf
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