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• W2308444875 abstract "Ecological stoichiometry deals with the coupling of the carbon (C), nitrogen (N) and phosphorus (P) cycles at the base of the aquatic food webs. Variation in C:N:P stoichiometry is driven by a multitude of factors, and the aim of this thesis is to assess natural variability and identify the key drivers of seasonal, inter-annual and regional C:N:P stoichiometry. PAPER I focuses on the drivers of seasonal variation in C:N:P stoichiometry in two 20-year time series in the Skagerrak. The main result was that the suspended particulate organic matter (seston) was composed of less than 50% autotrophs at both stations. The sestonic fractions have contrasting C:nutrient ratios, which could result in an apparent Redfield stability over the season. Light intensity and spectral composition can affect the carbon to nutrient ratios in autotrophs, and uptake of P in three arctic diatoms exposed to ultraviolet radiation (UVR) was tested in PAPER II. The results emphasize the species-specific physiological responses of P uptake under UVR stress, and showed in general little support to the hypothesis of increased P uptake during UVR exposure. PAPER III deals with the long-term trends in carbon, nutrients and stoichiometry in the Skagerrak. The nutrient concentrations decreased over the 20-year time period, while the concentrations of C and N in seston, dissolved organic N and the nonautotrophic material all increased significantly and non-linearly between 1998 and 2000. These trends were connected to a reported “darkening” of the coastal waters in Skagerrak, and indicates that a regime-shift took place in the early 2000’s. Over 3600 observations of the C:N ratio in the Arctic and pan-Arctic shelves were analysed in PAPER IV, covering an area not included in previous meta-analyses of seston stoichiometry. The C:N ratio in most regions was significantly higher than the Redfield ratio, and showed significant non-constant behaviour, thus violating the assumption of a constant ratio between C and N." @default.
• W2308444875 created "2016-06-24" @default.
• W2308444875 creator A5077137894 @default.
• W2308444875 date "2012-01-01" @default.
• W2308444875 modified "2023-09-27" @default.
• W2308444875 title "Carbon to nutrient ratios in marine systems: understanding natural variability" @default.
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