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dc.contributor.authorRepeta, Daniel J.  Concept link
dc.coverage.spatialBuzzards Bay, MA
dc.coverage.spatialPeru
dc.date.accessioned2008-02-15T19:12:08Z
dc.date.available2008-02-15T19:12:08Z
dc.date.issued1982-08
dc.identifier.urihttps://hdl.handle.net/1912/2073
dc.descriptionSubmitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution August 1982en
dc.description.abstractIn an effort to understand the more general mechanisms and rates of pre-depositional reactions that transform organic matter, the types and relevant time scales of reactions that transform carotenoid pigments in the oceanic water column were studied. Suspended particulate matter collected from surface waters of Buzzards Bay, Massachusetts and the Peru upwelling system has a carotenoid distribution reflecting the phytoplanktonic source of the material. The carotenoid distribution of sediment trap samples collected in these same areas was dominated by transformation products. Fucoxanthin, the primary carotenoid of marine diatoms, typically constituted 77-100% of the total fucopigments in suspended particulate material. In sediment trap samples this pigment constituted only 4-85% of the total. The remaining 15-96% of the pigments consisted of the fucoxanthin transformations products: free alcohols (2-94%), dehydrates (0-6%), and opened epoxides (0-19%). Preliminary results suggest that carotenoid esters are hydrolyzed to free alcohols at a rate determined by the turnover of primary productivity. The dehydrated and epoxide opened intermediates of fucoxanthin represent products of transformation reactions that operate over much longer time scales (0.1-10 yrs). Dehydration and epoxide opening are not significant water column transformations, but are important in surface sediments.en
dc.description.sponsorshipThis research was supported by the Ocean Sciences Section, National Science Foundation grants OCE 79-25352 and OCE 81-18436, the Office of Naval Research Contract N00014-74-Co-262NR 083-004, the Woods Hole Coastal Research Center project 25 000067 04, and a Woods Hole Oceanographic Institution Student Fellowship.en
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen
dc.publisherMassachusetts Institute of Technology and Woods Hole Oceanographic Institutionen
dc.relation.ispartofseriesWHOI Thesesen
dc.subjectCarotenoidsen_US
dc.subjectPhytoplanktonen_US
dc.subjectMarine sedimentsen_US
dc.subjectAtlantis II (Ship : 1963-) Cruise AII108-3en_US
dc.titleTransformations of carotenoids in the oceanic water columnen
dc.typeThesisen
dc.identifier.doi10.1575/1912/2073


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