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


Cheah, W and McMinn, A and Griffiths, FB and Westwood, KJ and Wright, SW and Molina, E and Webb, JP and van den Enden, R, Assessing Sub-Antarctic Zone primary productivity from fast repetition rate fluorometry, Deep-Sea Research. Part 2: Topical Studies in Oceanography, 58, (21-22) pp. 2179-2188. ISSN 0967-0645 (2011) [Refereed Article]

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DOI: doi:10.1016/j.dsr2.2011.05.023


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(461S, 1531E) were higher than P1inthe southwest of Tasmania (461S, 1401E) and P2 in the Polar Frontal Zone (541S, 1461E). The FRRF-derived PP rates were well correlated with 14C-uptake rates fromone-hour incubations(r2¼0.85,slope¼1.2370.05, po0.01, n¼85) but the relationship between both methods differed vertically and spatially. There was a linear relationship between FRRF-based PP and 14C-based PP underlight-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.

Item Details

Item Type:Refereed Article
Keywords:Antarctic Southern Ocean FRRF primary production
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Biological oceanography
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Biodiversity in Antarctic and Southern Ocean environments
UTAS Author:Cheah, W (Mr Wee Cheah)
UTAS Author:McMinn, A (Professor Andrew McMinn)
UTAS Author:Griffiths, FB (Mr F. Brian Griffiths)
UTAS Author:Westwood, KJ (Dr Karen Westwood)
UTAS Author:Wright, SW (Dr Simon Wright)
UTAS Author:Molina, E (Mr Ernesto Molina)
ID Code:75597
Year Published:2011
Web of Science® Times Cited:15
Deposited By:IMAS Research and Education Centre
Deposited On:2012-02-06
Last Modified:2017-11-06

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