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

Hassler, CS; Ridgway, KR; Bowie, AR; Butler, ECV; Clementson, LA; Doblin, MA; Davies, DM; Law, C; Ralph, PJ; Van Der Merwe, P; Watson, R; Ellwood, MJ

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

Hassler, CS Ridgway, KR Bowie, AR Butler, ECV Clementson, LA Doblin, MA

Davies, DM Law, C Ralph, PJ

Van Der Merwe, P Watson, R Ellwood, MJ

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Publication Type:: Journal Article
Citation:: Marine and Freshwater Research, 2014, 65 (6), pp. 517 - 537
Issue Date:: 2014-01-01

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Field	Value	Language
dc.contributor.author	Hassler, CS	en_US
dc.contributor.author	Ridgway, KR	en_US
dc.contributor.author	Bowie, AR	en_US
dc.contributor.author	Butler, ECV	en_US
dc.contributor.author	Clementson, LA	en_US
dc.contributor.author	Doblin, MA https://orcid.org/0000-0001-8750-3433	en_US
dc.contributor.author	Davies, DM	en_US
dc.contributor.author	Law, C	en_US
dc.contributor.author	Ralph, PJ https://orcid.org/0000-0002-3103-7346	en_US
dc.contributor.author	Van Der Merwe, P	en_US
dc.contributor.author	Watson, R	en_US
dc.contributor.author	Ellwood, MJ	en_US
dc.date.issued	2014-01-01	en_US
dc.identifier.citation	Marine and Freshwater Research, 2014, 65 (6), pp. 517 - 537	en_US
dc.identifier.issn	1323-1650	en_US
dc.identifier.uri	http://hdl.handle.net/10453/35888
dc.description.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. © CSIRO 2014.	en_US
dc.relation.ispartof	Marine and Freshwater Research	en_US
dc.relation.isbasedon	10.1071/MF13137	en_US
dc.subject.classification	Marine Biology & Hydrobiology	en_US
dc.title	Primary productivity induced by iron and nitrogen in the Tasman Sea: An overview of the PINTS expedition	en_US
dc.type	Journal Article
utslib.citation.volume	6	en_US
utslib.citation.volume	65	en_US
utslib.for	050102 Ecosystem Function	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - C3 - Climate Change Cluster
utslib.copyright.status	closed_access
pubs.issue	6	en_US
pubs.publication-status	Published	en_US
pubs.volume	65	en_US

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. © CSIRO 2014.

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http://hdl.handle.net/10453/35888