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MicroPolar - Eukaryotes

ABSTRACT: Processes and Players in Arctic Marine Pelagic Food Webs - Biogeochemistry, Environment and Climate Change - Eukaryotes

PROVIDER: PRJEB40133 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR4796213_1.fastq.gz	Fastqsanger.gz
	ERR4796213_2.fastq.gz	Fastqsanger.gz
	ERR4833230_1.fastq.gz	Fastqsanger.gz
	ERR4833230_2.fastq.gz	Fastqsanger.gz
	ERR4833240_1.fastq.gz	Fastqsanger.gz

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MicroPolar - Eukaryotes

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Project description:It is widely accepted that in many food webs, the trophic transfer efficiency among primary producers and herbivores is determined by the nutritional value of primary producers. In pelagic freshwater and marine ecosystems, secondary production by herbivorous crustacean zooplankton is often limited by the seston's content of essential ω3 polyunsaturated fatty acids (ω3 PUFAs). However, little is known about the genetic network behind the positive relationship between phytoplankton ω3 PUFA content and zooplankton growth and reproduction. In our experimental study, we analysed gene expression changes of the freshwater cladoceran Daphnia magna under different food regimes differing in their ω3 PUFA composition. To disentangle ω3 PUFA effects from other factors, we fed D. magna with different pure phytoplankton cultures (i.e., algal and cyanobacterial diets) with or without supplementing the essential ω3 PUFA eicosapentaenoic acid (EPA). As hypothesized, we observed enhanced growth on diets supplemented with EPA. We applied an Illumina RNA-seq approach to D. magna from different diet treatments to find and monitor genes that are regulated dependent on EPA availability. Of 26,646 potential protein products (mapped to the D. magna genome), we identified transcriptomic signatures driven by the different food sources. Further analyses revealed specific candidate genes involved in EPA metabolism, irrespective of the basal food source. This allows a first functional annotation of previously uncharacterized genes involved in the EPA-specific response of D. magna and may finally provide a link to molecular processes connected to ω3 PUFA metabolism and conversion and thus trophic transfer efficiency in pelagic food webs.

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