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

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,...

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Bibliographic Details
Published in:Deep Sea Research Part II: Topical Studies in Oceanography
Main Authors: Cheah, W, McMinn, A, Griffiths, FB, Westwood, KJ, Wright, SW, Molina, E, Webb, JP, van den Enden, R
Format: Article in Journal/Newspaper
Language:English
Published: Pergamon-Elsevier Science Ltd 2011
Subjects:
Earth Sciences
Oceanography
Biological Oceanography
Antarctic
Antarc*
Online Access:https://doi.org/10.1016/j.dsr2.2011.05.023
http://ecite.utas.edu.au/75597
Description
Summary: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 wellcorrelated with 14C-uptake rates fromone-hour incubations(r20.85,slope1.2370.05, po0.01,n85) but the relationship between both methods differed vertically and spatially. There was a linearrelationship between FRRF-based PP and 14C-based PP underlight-limited conditions in deeper waters.Under light-saturated conditions near the surface(045m),the relationship was less clear. This waslikely associated with the effects of physiological processes such as cyclic electron flow and the Mehlerreaction, which are stimulated at high irradiance. Our results indicate that FRRF can be used to estimatephotosynthesis rates in the SAZ and PFZ but to derive an accurate estimation of C-fixation requires adetailed understanding of the physiological properties of the cells and their response to oceanographicparameters under different environmental conditions.

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