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• W2008300615 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 319:167-173 (2006) - doi:10.3354/meps319167 Astaxanthin in the calanoid copepod Calanus helgolandicus: dynamics of esterification and vertical distribution in the German Bight, North Sea Frank Sommer1,*, Cristian Agurto2, Peter Henriksen3, Thomas Kiørboe1 1Danish Institute for Fisheries Research, Marine Ecology and Aquaculture, Kavalergården 6, 2920 Charlottenlund, Denmark 2Leibniz-Institute for Marine Sciences, Marine Ecology, Düsternbrooker Weg 20, 24105 Kiel, Germany 3National Environmental Research Institute, Marine Ecology, Frederiksborgvej 399, PO Box 358, 4000 Roskilde, Denmark *Email: fso@dfu.min.dk ABSTRACT: Zooplankton synthesise astaxanthin, a carotenoid pigment believed to protect against high-energy irradiance, from precursors in their diet. Different patterns of astaxanthin vertical distribution would be expected from the benefits of photoprotection, the costs of visual predation and the availability of food. Despite a highly resolved sampling approach (4 m depth intervals), no clear pattern of vertical distribution or correlation with chlorophyll a concentrations was found for Calanus helgolandicus astaxanthin concentrations in the German Bight. This may be attributable to photochromatic adaptation in phytoplankton, diurnal rhythms of copepod grazing and, particularly, vertical migration. A 2 × 2 factorial (light × food) experiment showed that total astaxanthin concentrations in C. helgolandicus were entirely determined by the dynamics of esterified astaxanthin. As expected, the concentrations of astaxanthin esters decreased in starved individuals in the dark, while the combined presence of food and light resulted in an increase of esterified astaxanthin. Similar levels of esterified astaxanthin were maintained in both starving individuals exposed to light and feeding individuals in the dark. The latter implies that astaxanthin esterification is per se a process independent of light, although light exposure enhances it. It is proposed that the function of astaxanthin esters is to generally improve the antioxidant protection of storage lipids, also in situations where photoprotection is not required. KEY WORDS: Astaxanthin · Carotenoids · Pigments · Photoprotection · Vertical migration Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 319. Online publication date: August 18, 2006 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2006 Inter-Research." @default.
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• W2008300615 title "Astaxanthin in the calanoid copepod Calanus helgolandicus: dynamics of esterification and vertical distribution in the German Bight, North Sea" @default.
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