4.7 Article

A light-induced shortcut in the planktonic microbial loop

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SCIENTIFIC REPORTS
卷 6, 期 -, 页码 -

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NATURE PUBLISHING GROUP
DOI: 10.1038/srep29286

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资金

  1. European Union Seventh Framework Program MESOAQUA (FP7) [228224]
  2. German Research Council [DFG Pt 5/3-1]
  3. Spanish project REMEI from the Spanish Ministry of Economy and Competitiveness [CTM2015-70340]
  4. project PROTOS from the Spanish Ministry of Economy and Competitiveness [CTM2009-08783]

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Mixotrophs combine photosynthesis with phagotrophy to cover their demands in energy and essential nutrients. This gives them a competitive advantage under oligotropihc conditions, where nutrients and bacteria concentrations are low. As the advantage for the mixotroph depends on light, the competition between mixo- and heterotrophic bacterivores should be regulated by light. To test this hypothesis, we incubated natural plankton from the ultra-oligotrophic Eastern Mediterranean in a set of mesocosms maintained at 4 light levels spanning a 10-fold light gradient. Picoplankton (heterotrophic bacteria (HB), pico-sized cyanobacteria, and small-sized flagellates) showed the fastest and most marked response to light, with pronounced predator-prey cycles, in the high-light treatments. Albeit cell specific activity of heterotrophic bacteria was constant across the light gradient, bacterial abundances exhibited an inverse relationship with light. This pattern was explained by light-induced top-down control of HB by bacterivorous phototrophic eukaryotes (PE), which was evidenced by a significant inverse relationship between HB net growth rate and PE abundances. Our results show that light mediates the impact of mixotrophic bacterivores. As mixo- and heterotrophs differ in the way they remineralize nutrients, these results have far-reaching implications for how nutrient cycling is affected by light.

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