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• W2105686893 startingPage "1590" @default.
• W2105686893 abstract "According to modern oceanographic perspectives that emphasize microbial pathways, phagotrophic protists comprise one to several levels of intermediate consumers between phytoplankton and larger metazooplankton (copepods and krill). However, recent attempts to quantify pelagic trophic structure in the open ocean using nitrogen stable isotope techniques have brought into question whether such measurements adequately account for protistan trophic steps. Here, we use a two‐stage chemostat system, with Dunaliella tertiolecta and Oxyrrhis marina as a predator—prey model, to address this question experimentally. To investigate 15 N trophic discrimination under different conditions of nitrogen availability and recycling, Oxyrrhis was fed in the light and in the dark on phytoplankton provided with high and low nutrient ratios of N : P. We used both bulk and amino acids—compound specific isotopic analysis (AA—CSIA) to distinguish trophic fractionation from changes in the δ 15 N values of phytoplankton (isotopic baseline). Results demonstrate that protistan consumers are not, in fact, significantly enriched in 15 N relative to their prey, a marked departure from the general findings for metazoan consumers. In addition, we show that changes in the isotopic baseline propagate rapidly through the protistan food chain, highlighting the need to account for this variability at ecologically relevant time scales. If protistan trophic steps are largely invisible or significantly underestimated using nitrogen isotope measurements, research that utilize such measurements in ecological, fisheries, and climate change studies may miss a large part of the ocean's variability in food‐web structure and ecosystem function." @default.
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• W2105686893 date "2014-08-03" @default.
• W2105686893 modified "2023-10-17" @default.
• W2105686893 title "Isotopic invisibility of protozoan trophic steps in marine food webs" @default.
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• W2105686893 doi "https://doi.org/10.4319/lo.2014.59.5.1590" @default.
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