Abstract.A comprehensive multi-proxy study on two sediment cores from western and central Skagerrak was performed in order to detect the variability and causes of marine primary productivity changes in the investigated region over the last 1100 years. The cores were dated by Hg pollution records and AMS 14 C dating and analysed for palaeoproductivity proxies such as total organic carbon, δ 13 C, total planktonic foraminifera, benthic foraminifera (total as well as abundance of Brizalina skagerrakensis and other palaeoproductivity taxa) and palaeothermometers such as Mg/Ca and δ 18 O. Our results reveal three 5
Growth of marine microalgae is stimulated by enhanced concentrations of major nutrients like nitrogen and phosphorus in the photic zone (e.g. Sigman and Hain, 2012). Microalgae in the oceans are primary producers, which provide food for consumers at higher trophic levels and oxygen for respiration (e.g. Micheli, 1999). Through photosynthesis and the biological pump, marine primary producers also extract CO 2 from the atmosphere. Carbon, nutrients and trace elements, which are fixed by primary producers, are further ingested by higher organisms or sink to the ocean floor where they are stored in the form of organic matter. The organic matter
Growth of marine microalgae is stimulated by enhanced concentrations of major nutrients like nitrogen and phosphorus in the photic zone (e.g. Sigman and Hain, 2012). Microalgae in the oceans are primary producers, which provide food for consumers at higher trophic levels and oxygen for respiration (e.g. Micheli, 1999). Through photosynthesis and the biological pump, marine primary producers also extract CO 2 from the atmosphere. Carbon, nutrients and trace elements, which are fixed by primary producers, are further ingested by higher organisms or sink to the ocean floor where they are stored in the form of organic matter. The organic matter
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