Assessing Sub-Antarctic Zone primary productivity from fast repetition rate fluorometry

W. Cheah; A. McMinn; F. B. Griffiths; K.J. Westwood; S.W. Wright; E. Molina; J.P. Webb; R. van den Enden

doi:10.1016/j.dsr2.2011.05.023

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Assessing Sub-Antarctic Zone primary productivity from fast repetition rate fluorometry

Journal article

Open access

Peer reviewed

Assessing Sub-Antarctic Zone primary productivity from fast repetition rate fluorometry

W. Cheah, A. McMinn, F. B. Griffiths, K.J. Westwood, S.W. Wright, E. Molina, J.P. Webb and R. van den Enden

Deep Sea Research Part II: Topical Studies in Oceanography, Vol.58(21-22), pp.2179-2188

2011

DOI: https://doi.org/10.1016/j.dsr2.2011.05.023

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Abstract

In situ primary productivity (PP) in the Sub-Antarctic Zone (SAZ) and the Polar Frontal Zone (PFZ) south of Australia was estimated using fast repetition rate fluorometry (FRRF). FRRF-derived PP at Process station 3 (P3) southeast of Tasmania (46°S, 153°E) were higher than P1 in the southwest of Tasmania (46°S, 140°E) and P2 in the Polar Frontal Zone (54°S, 146°E). The FRRF-derived PP rates were well correlated with 14C-uptake rates from one-hour incubations (r2=0.85, slope=1.23±0.05, p<0.01, n=85) but the relationship between both methods differed vertically and spatially. There was a linear relationship between FRRF-based PP and 14C-based PP under light-limited conditions in deeper waters. Under light-saturated conditions near the surface (0-45m), the relationship was less clear. This was likely associated with the effects of physiological processes such as cyclic electron flow and the Mehler reaction, which are stimulated at high irradiance. Our results indicate that FRRF can be used to estimate photosynthesis rates in the SAZ and PFZ but to derive an accurate estimation of C-fixation requires a detailed understanding of the physiological properties of the cells and their response to oceanographic parameters under different environmental conditions.

Details

Title: Assessing Sub-Antarctic Zone primary productivity from fast repetition rate fluorometry
Authors/Creators: W. Cheah (Author/Creator) - Antarctic Climate and Ecosystems Cooperative Research Centre
A. McMinn (Author/Creator) - Antarctic Climate and Ecosystems Cooperative Research Centre
F. B. Griffiths (Author/Creator) - Antarctic Climate and Ecosystems Cooperative Research Centre
K.J. Westwood (Author/Creator) - Antarctic Climate and Ecosystems Cooperative Research Centre
S.W. Wright (Author/Creator) - Antarctic Climate and Ecosystems Cooperative Research Centre
E. Molina (Author/Creator) - Institute for Marine and Antarctic Studies
J.P. Webb (Author/Creator) - Murdoch University
R. van den Enden (Author/Creator) - Antarctic Climate and Ecosystems Cooperative Research Centre
Publication Details: Deep Sea Research Part II: Topical Studies in Oceanography, Vol.58(21-22), pp.2179-2188
Publisher: Elsevier BV
Identifiers: 991005540152407891
Copyright: © 2011 Elsevier Ltd.
Murdoch Affiliation: School of Biological Sciences and Biotechnology
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration
Citation topics: 3 Agriculture, Environment & Ecology; 3.2 Marine Biology; 3.2.154 Phytoplankton Dynamics
Web Of Science research areas: Oceanography
ESI research areas: Geosciences