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                <title xml:lang="en">Influence of cyclonic and anticyclonic eddies on plankton in the southeastern Mediterranean Sea during late summertime</title>
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                    <forename type="first">Arseniy R.</forename>
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              <p>Planktonic food webs were studied contemporaneously in a mesoscale cyclonic (upwelling, ∼ 13 months old) and an anticyclonic (downwelling, ∼ 2 months old) eddy as well as in an uninfluenced background situation in the oligotrophic southeastern Mediterranean Sea (SEMS) during late summer 2018. We show that integrated nutrient concentrations were higher in the cyclone compared to the anticyclone or the background stations by 2-13-fold. Concurrently, Synechococcus and Prochlorococcus were the dominant autotrophs abundance-wise in the oligotrophic anticyclone (∼ 300 × 10&lt;SUP&gt;10&lt;/SUP&gt; cells m&lt;SUP&gt;-2&lt;/SUP&gt;). In the cyclone, functional groups such as dinoflagellates, Prymnesiophyceae and Ochrophyta contributed substantially to the total phytoplankton abundance (∼ 14 × 10&lt;SUP&gt;10&lt;/SUP&gt; cells m&lt;SUP&gt;-2&lt;/SUP&gt;), which was ∼ 65 % lower at the anticyclone and background stations (∼ 5 × 10&lt;SUP&gt;10&lt;/SUP&gt; cells m&lt;SUP&gt;-2&lt;/SUP&gt;). Primary production was highest in the cyclonic eddy (191 mgC&lt;SUP&gt;m-2&lt;/SUP&gt;&lt;SUP&gt;d-1&lt;/SUP&gt;) and 2-5-fold lower outside the eddy area. Heterotrophic prokaryotic cell-specific activity was highest in the cyclone (∼ 10 fgC&lt;SUP&gt;cell-1&lt;/SUP&gt;&lt;SUP&gt;d-1&lt;/SUP&gt;), while the least productive cells were found in the anticyclone (4 fgC&lt;SUP&gt;cell-1&lt;/SUP&gt;&lt;SUP&gt;d-1&lt;/SUP&gt;). Total zooplankton biomass in the upper 300 m was 10-fold higher in the cyclone compared with the anticyclone or background stations (1337 vs. 112-133 mg C m&lt;SUP&gt;-2&lt;/SUP&gt;, respectively). Copepod diversity was much higher in the cyclone (44 species), compared to the anticyclone (6 small-size species). Our results highlight that cyclonic and anticyclonic eddies show significantly different community structure and food-web dynamics in oligotrophic environments, with cyclones representing productive oases in the marine desert of the SEMS.</p>
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