Heterotrophic prokaryote (HP), HNA cells concentrations (10⁵cells cm⁻³) and ratio of HP to total photosynthetic carbon biomass (HP/PHYTO) at Pt. B station in 2009 (N = 306) and 2010 (N = 300).

<p>Heterotrophic prokaryote (HP), HNA cells concentrations (10⁵cells cm⁻³) and ratio of HP to total photosynthetic carbon biomass (HP/PHYTO) at Pt. B station in 2009 (N = 306) and 2010 (N = 300).</p

Integrate biomasses (mg C m^-2) over the 0–75 m water column of Chl <i>a</i>, HP, picoeukaryotes, nanoeukaryotes, <i>Synechococcus</i>, and <i>Prochlorococcus</i> at Pt. B station in 2009 and 2010.

<p>Integrate biomasses (mg C m^-2) over the 0–75 m water column of Chl <i>a</i>, HP, picoeukaryotes, nanoeukaryotes, <i>Synechococcus</i>, and <i>Prochlorococcus</i> at Pt. B station in 2009 and 2010.</p

PCA variables factor map representing projection of variables on the plane defined by the first two principal components.

<p>The cycle of correlation represents the changes of the biological and biogeochemical parameters over time.</p

Principal Components Analysis (PCA) ACP-Plan 1/2, applied to data from 6 January 2009 to 28 December 2010.

<p>The 42-active data set consisted of 101 week values described by 42 biological variables: HP, <i>Synechococcus</i>, <i>Prochlorococcus</i>, picoeukaryotes, nanoeukaryotes abundances, fluorescence intensity and the Chl <i>a</i> concentration at 6 discrete depths (0, 10, 20, 30, 50, 75 m). Illustrative variables are concentrations of nutrients (NO₂^-, NO₃^-, PO₄^3-, Si(OH)₄, POC concentrations. In red the year 2009, in blue 2010. N = 7420. The blue zone in the figure corresponds to the seasonal variability between 2009 and 2010 highlight by the ACP.</p