Phytoplankton community structure in a high-nutrient, low-chlorophyll region of the eastern Pacific Subantarctic region during winter-mixed and summer-stratified conditions - Université Clermont Auvergne Accéder directement au contenu
Article Dans Une Revue Deep Sea Research Année : 2012

Phytoplankton community structure in a high-nutrient, low-chlorophyll region of the eastern Pacific Subantarctic region during winter-mixed and summer-stratified conditions

Résumé

PhytoplanktoncommunitystructurewasanalysedintheSubantarcticsectoroftheeasternSouth Pacific,ahigh-nutrient,low-chlorophyll(HNLC)region,duringaperiodofdeepverticalmixing(austral winterAug-Oct,2005)whenAntarcticIntermediateWater(AAIW)getsformed,andduringaperiodof water-columnstratificationcharacterisedbyshallowmixedlayers(australsummerFeb-Mar,2006). We examinedboththeentirephytoplanktonassemblagethroughtheuseofdiagnosticpigmentsand also thepicophytoplanktonfraction(o3 mm) throughtheuseofclass-specificmolecularprobesand flow cytometry.Boththepigmentandmoleculardatarevealadominanceofprymnesiophytesduringboth the winter-mixedandsummer-stratifiedperiods.Chrysophytesandtheirdiagnosticpigmentswerealso present throughoutmostofthestudyregion.Flowcytometricanalysisrevealedthatthecontributionof photosyntheticpicoeukaryotes(PPEs)tototalpicophytoplankton(PPEsþpicocyanobacteria)abundances increasessystematicallywithincreasinglatitudeanddecreasingtemperature,highlightingtheimportance of PPEsintheSouthernOcean
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hal-00848697 , version 1 (27-07-2013)

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  • HAL Id : hal-00848697 , version 1

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Heather Bouman, Cécile Lep Ere, David J.Scanlan, Osvaldo Ulloa. Phytoplankton community structure in a high-nutrient, low-chlorophyll region of the eastern Pacific Subantarctic region during winter-mixed and summer-stratified conditions. Deep Sea Research, 2012, I 69, pp.1-11. ⟨hal-00848697⟩
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