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

Abstract : 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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Submitted on : Saturday, July 27, 2013 - 10:53:41 PM
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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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