@article{fdi:010068813,
  title = {{A}ssessing spatial and temporal variability of phytoplankton communities' composition in the {I}roise {S}ea ecosystem ({B}rittany, {F}rance) : a 3{D} modeling approach. {P}art 1 : {B}iophysical control over plankton functional types succession and distribution},
  author = {{C}adier, {M}. and {G}orgues, {T}homas and {S}ourisseau, {M}. and {E}dwards, {C}. {A}. and {A}umont, {O}livier and {M}arie, {L}. and {M}emery, {L}.},
  editor = {},
  language = {{ENG}},
  abstract = {{U}nderstanding the dynamic interplay between physical, biogeochemical and biological processes represents a key challenge in oceanography, particularly in shelf seas where complex hydrodynamics are likely to drive nutrient distribution and niche partitioning of phytoplankton communities. {T}he {I}roise {S}ea includes a tidal front called the '{U}shant {F}ront' that undergoes a pronounced seasonal cycle, with a marked signal during the summer. {T}hese characteristics as well as relatively good observational sampling make it a region of choice to study processes impacting phytoplankton dynamics. {T}his innovative modeling study employs a phytoplankton-diversity model, coupled to a regional circulation model to explore mechanisms that alter biogeography of phytoplankton in this highly dynamic environment. {P}hytoplankton assemblages are mainly influenced by the depth of the mixed layer on a seasonal time scale. {I}ndeed, solar incident irradiance is a limiting resource for phototrophic growth and small phytoplankton cells are advantaged over larger cells. {T}his phenomenon is particularly relevant when vertical mixing is intense, such as during winter and early spring. {R}elaxation of wind-induced mixing in {A}pril causes an improvement of irradiance experienced by cells across the whole study area. {T}his leads, in late spring, to a competitive advantage of larger functional groups such as diatoms as long as the nutrient supply is sufficient. {T}his dominance of large, fast-growing autotrophic cells is also maintained during summer in the productive tidally-mixed shelf waters. {I}n the oligotrophic surface layer of the western part of the {I}roise {S}ea, small cells coexist in a greater proportion with large, nutrient limited cells. {T}he productive {U}shant tidal front's region (1800 mg{C}.m(-2).d(-1) between {A}ugust and {S}eptember) is also characterized by a high degree of coexistence between three functional groups (diatoms, micro/nano-flagellates and small eukaryotes/cyanobacteria). {C}onsistent with previous studies, the biogeography of phytoplankton functional types at the {U}shant front during summer displays an intermediate community composition between contrasted sub-regions on either side of the front. {S}trong mixing conditions within the frontal sub-region result in a short residence time of water masses, not allowing speciation or long term adaptation to occur.},
  keywords = {{I}roise {S}ea ; {T}idal mixing front ; {B}iogeochemical modeling ; {P}hytoplankton ; {F}unctional groups ; {S}easonal cycle ; {FRANCE} ; {BRETAGNE} ; {MER} {D}'{IROISE}},
  booktitle = {},
  journal = {{J}ournal of {M}arine {S}ystems},
  volume = {165},
  numero = {},
  pages = {47--68},
  ISSN = {0924-7963},
  year = {2017},
  DOI = {10.1016/j.jmarsys.2016.09.009},
  URL = {https://www.documentation.ird.fr/hor/fdi:010068813},
}