@article{fdi:010070852,
  title = {{A} synoptic assessment of the {A}mazon river-ocean continuum during boreal autumn : from physics to plankton communities and carbon flux},
  author = {{A}raujo, {M}. and {N}oriega, {C}. and {H}ounsou-gbo, {G}. {A}. and {V}eleda, {D}. and {A}raujo, {J}. and {B}ruto, {L}. and {F}eitosa, {F}. and {F}lores-{M}ontes, {M}. and {L}ef{\`e}vre, {N}athalie and {M}elo, {P}. and {O}tsuka, {A}. and {T}ravassos, {K}. and {S}chwamborn, {R}. and {N}eumann-{L}eitao, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {A}mazon generates the world's largest offshore river plume, which covers extensive areas of the tropical {A}tlantic. {T}he data and samples in this study were obtained during the oceanographic cruise {C}amadas {F}inas {III} in {O}ctober 2012 along the {A}mazon {R}iver-{O}cean {C}ontinuum ({AROC}). {T}he cruise occurred during boreal autumn, when the river plume reaches its maximum eastward extent. {I}n this study, we examine the links between physics, biogeochemistry and plankton community structure along the {AROC}. {H}ydrographic results showed very different conditions, ranging from shallow well-mixed coastal waters to offshore areas, where low salinity {A}mazonian waters mix with open ocean waters. {N}utrients, mainly {NO}3- and {S}i{O}2-, were highly depleted in coastal regions, and the magnitude of primary production was greater than that of respiration (negative apparent oxygen utilization). {I}n terms of phytoplankton groups, diatoms dominated the region from the river mouth to the edge of the area affected by the {N}orth {B}razil {C}urrent ({NBC}) retroflection (with chlorophyll a concentrations ranging from 0.02 to 0.94 mg m(-3)). {T}he {N}orth {E}quatorial {C}ounter {C}urrent ({NECC}) region, east of retroflection, is fully oligotrophic and the most representative groups are {C}yanobacteria and dinoflagellates. {A}dditionally, in this region, blooms of cyanophyte species were associated with diatoms and {M}esozooplankton (copepods). {A} total of 178 zooplankton taxa were observed in this area, with {C}opepoda being the most diverse and abundant group. {T}wo different zooplankton communities were identified: a low-diversity, high-abundance coastal community and a high-diversity, low-abundance oceanic community offshore. {T}he {CO}2 fugacity (f{CO}(2)sw), calculated from total alkalinity (1,450 < {TA} < 2,394 mu mol kg(-1)) and dissolved inorganic carbon (1,303 < {DIC} < 2,062 mu mol kg(-1)) measurements, confirms that the {A}mazon {R}iver plume is a sink of atmospheric {CO}2 in areas with salinities < 35 psu, whereas, in regions with salinities >35 and higher-intensity winds, the {CO}2 flux is reversed. {L}ower f{CO}(2)sw values were observed in the {NECC} area. {T}he {D}elta f{CO}(2) in this region was less than 5 mu atm (-0.3 mmol m(-2) d(-1)), while the {D}elta f{CO}(2) in the coastal region was approximately 50 mu atm (+3.7 mmol m(-2) d(-1)). {D}uring the cruise, heterotrophic and autotrophic processes were observed and are indicative of the influences of terrestrial material and biological activity, respectively.},
  keywords = {{A}mazon {R}iver-{O}cean {C}ontinuum ; biogeochemistry ; carbon cycle ; plankton communities ; {C}amadas {F}inas {III} ; tropical {A}tlantic ; {ATLANTIQUE} ; {ZONE} {TROPICALE} ; {AMAZONE}},
  booktitle = {},
  journal = {{F}rontiers in {M}icrobiology},
  volume = {8},
  numero = {},
  pages = {art. 1358 [18 p.]},
  ISSN = {1664-302{X}},
  year = {2017},
  DOI = {10.3389/fmicb.2017.01358},
  URL = {https://www.documentation.ird.fr/hor/fdi:010070852},
}