N2 fixation and N cycling in the south-eastern Indian Ocean: from the Tropics to the Subtropics

    Research output: ThesisDoctoral Thesis

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    Abstract

    This thesis quantified regional gradients in nitrogen (N) and carbon (C) fixation in the south-eastern Indian Ocean, identifying the potential importance of N2-fixation in supporting up to 50% of regional new production (2 nmol N.L-1.h-1 through Trichodesmium (in the tropics) and unicellular N2-fixers in temperate regions. The presence of mesoscale eddies locally increased (in warm-core eddies) and decreased (in cold-core eddies) N2-fixation. Genetic analyses indicated that proteobacteria we re the primary organisms fixing N. The presence of Archaeal and Bacterial ammonification genes along with denitrifiers (Rhodobacteraceae) in the mixed layer suggested rapid shallow recycling of N in the south-eastern Indian Ocean.
    Original languageEnglish
    QualificationDoctor of Philosophy
    Awarding Institution
    • The University of Western Australia
    Award date8 Aug 2016
    Publication statusUnpublished - 2015

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