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 y 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.
|Qualification||Doctor of Philosophy|
|Award date||8 Aug 2016|
|Publication status||Unpublished - 2015|