Eva Leu

TL;DR: The distinct locality-specific profiles in Daphnia strongly suggest a kind of FA-fingerprint, but the data do not allow strict statements on the use of specific FAs as trophic markers.

TL;DR: These data are the first quantitative characterisation, including absolute intensities, spectral composition and photoperiod of biologically relevant solar ambient light in the high Arctic during the polar night, and indicate that some species of Arctic zooplankton are able to detect and utilize ambient light down to 20–30m depth during the Arctic polar night.

TL;DR: High intensities of photosynthetically active radiation increase C:P-ratios in experiments with arctic marine and freshwater phytoplankton species, while high levels of PAR promote high autotrophic productivity, which may invoke a “paradox of enrichment” effect since this means lower stoichiometric food quality for herbivores.

TL;DR: It is indicated that UV radiation has strong negative effects on photosynthesis and biomass production, but not on food quality with regard to PUFAs and stoichiometry, which affects the nutritional quality and the digestibility by zooplankton.

TL;DR: While diatoms (together with prasinophytes and haptophytes) increased during phase 3 mainly in the low and intermediate pCO2 treatments, dinoflagellates were favoured by high CO2 concentrations during the same time period, reflected in the development of group-specific fatty acid trophic markers.