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Primary productivity induced by iron and nitrogen in the Tasman Sea: an overview of the PINTS expedition

Citation

Hassler, CS and Ridgway, KR and Bowie, AR and Butler, ECV and Clementson, LA and Doblin, MA and Davies, DM and Law, C and Ralph, PJ and van der Merwe, P and Watson, R and Ellwood, MJ, Primary productivity induced by iron and nitrogen in the Tasman Sea: an overview of the PINTS expedition, Marine and Freshwater Research, 65, (6) pp. 517-537. ISSN 1323-1650 (2014) [Refereed Article]

Copyright Statement

Copyright 2014 CSIRO Publishing

DOI: doi:10.1071/MF13137

Abstract

The Tasman Sea and the adjacent subantarctic zone (SAZ) are economically important regions, where the parameters controlling the phytoplankton community composition and carbon fixation are not yet fully resolved. Contrasting nutrient distributions, as well as phytoplankton biomass, biodiversity and productivity were observed between the North Tasman Sea and the SAZ. In situ photosynthetic efficiency (FV/FM), dissolved and particulate nutrients, iron biological uptake, and nitrogen and carbon fixation were used to determine the factor-limiting phytoplankton growth and productivity in the North Tasman Sea and the SAZ. Highly productive cyanobacteria dominated the North Tasman Sea. High atmospheric nitrogen fixation and low nitrate dissolved concentrations indicated that non-diazotroph phytoplankton are nitrogen limited. Deck-board incubations also suggested that, at depth, iron could limit eukaryotes, but not cyanobacteria in that region. In the SAZ, the phytoplankton community was dominated by a bloom of haptophytes. The low productivity in the SAZ was mainly explained by light limitation, but nitrogen, silicic acid as well as iron were all depleted to the extent that they could become co-limiting. This study illustrates the challenge associated with identification of the limiting nutrient, as it varied between phytoplankton groups, depths and sites.

Item Details

Item Type:Refereed Article
Keywords:primary productivity, iron, nitrogen, Tasman Sea, PINTS
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical Oceanography
Objective Division:Environment
Objective Group:Physical and Chemical Conditions of Water
Objective Field:Physical and Chemical Conditions of Water in Marine Environments
Author:Bowie, AR (Associate Professor Andrew Bowie)
Author:Davies, DM (Ms Diana Davies)
Author:van der Merwe, P (Mr Pier Van Der Merwe)
ID Code:91506
Year Published:2014
Funding Support:Australian Research Council (DP1092892)
Web of Science® Times Cited:11
Deposited By:IMAS Research and Education Centre
Deposited On:2014-05-21
Last Modified:2015-03-27
Downloads:0

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