Annual cycle of mean abundances of (A) Calanus spp, (B) Acartia spp, (C) Oithona spp, (D) Corycaeus spp, (E) Temora spp, (F) Oncaea spp and G) Harpacticoïds during SP (black) and NSP (red) with percentiles Q1 and Q3 (shaded area) at B2.

<p>Annual cycle of mean abundances of (A) Calanus spp, (B) Acartia spp, (C) Oithona spp, (D) Corycaeus spp, (E) Temora spp, (F) Oncaea spp and G) Harpacticoïds during SP (black) and NSP (red) with percentiles Q1 and Q3 (shaded area) at B2.</p

Annual cycle of mean abundances of the (A) Siphonophores, (B) Chaetognaths, (C) Copepods, (D) Appendicularians, (E) Jellyfish and (F) Ostracods during SP (black) and NSP (red) with percentiles Q1 and Q3 (shaded area) at B2.

<p>Annual cycle of mean abundances of the (A) Siphonophores, (B) Chaetognaths, (C) Copepods, (D) Appendicularians, (E) Jellyfish and (F) Ostracods during SP (black) and NSP (red) with percentiles Q1 and Q3 (shaded area) at B2.</p

Descriptive statistics (Average and Standard Deviation) of the identified zooplankton in the sampling site and the Wilcoxon test showing the difference betweeen the SP and NSP in p-value order.

<p>Descriptive statistics (Average and Standard Deviation) of the identified zooplankton in the sampling site and the Wilcoxon test showing the difference betweeen the SP and NSP in p-value order.</p

Monthly mean temperature, salinity and density of the NSP (A, B, C respectively) and SP (D, E, F respectively) in the water column at B2.

<p>Monthly mean temperature, salinity and density of the NSP (A, B, C respectively) and SP (D, E, F respectively) in the water column at B2.</p

Monthly time-series of the (A) mean salinity values and (B) total zooplankton abundance in the water column at B2 between 2000 and 2013 (refer to S2 Table for more details on total zooplankton).

<p>The red line corresponds to the STARS shift detection method [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0158484#pone.0158484.ref064" target="_blank">64</a>] that detects significant changes in the mean (α = 0.05).</p

Annual cycle of mean abundances of the (A) Nanoplankton and (B) Microphytoplankton during SP (black) and NSP (red) with percentiles Q1 and Q3 (shaded area) at B2.

<p>Annual cycle of mean abundances of the (A) Nanoplankton and (B) Microphytoplankton during SP (black) and NSP (red) with percentiles Q1 and Q3 (shaded area) at B2.</p

Spatial distribution of nitracline depth, nitracline thickness, phosphocline depth and phosphocline thickness (A, B), mean (±SD) zooplankton δ¹⁵N (C, D), and mean (±SD) relative contribution (%) of atmospheric input to zooplankton biomass (E, F) along 23°W and 18°N, respectively.

<p>Spatial distribution of nitracline depth, nitracline thickness, phosphocline depth and phosphocline thickness (A, B), mean (±SD) zooplankton δ¹⁵N (C, D), and mean (±SD) relative contribution (%) of atmospheric input to zooplankton biomass (E, F) along 23°W and 18°N, respectively.</p

Sections of temperature (°C), salinity (PSU), potential density anomaly σ_θ (kg m^-3) and chlorophyll-<i>a</i> (mg m^-3) in the upper 300 m of the 23°W transect (A, C, E, G) and the 18°N transect (B, D, F, G), respectively.

<p>Sections of temperature (°C), salinity (PSU), potential density anomaly σ_θ (kg m^-3) and chlorophyll-<i>a</i> (mg m^-3) in the upper 300 m of the 23°W transect (A, C, E, G) and the 18°N transect (B, D, F, G), respectively.</p

Contribution of calculated atmospheric N input (%) to zooplankton biomass as a function of integrated <i>Trichodesmium</i> abundance (colonies m^-2).

<p>The station at 18°N, 19°41’W within the eddy (denoted with an empty circle) was excluded from the analysis. The inset shows UVP5 example images of Trichodesmium puff and tuft, respectively.</p

72-hour Hysplit back trajectories of air masses that reached positions along 23°W at 1000 m height for October 23 (green), November 8 (red) and November 16 (blue).

<p>The inset shows the average satellite rainfall (mm h^-1) along 23°W within the longitude range 22°W to 24°W for November 2012. Black lines denote the sampled transects at 23°W and 18°N.</p