Interpretation of fast repetition rate (FRR) fluorescence: signatures of phytoplankton community structure versus physiological state

Suggett, David J.; Moore, C. Mark; Hickman, Anna E.; Geider, Richard J.

doi:10.3354/meps07830

Cited by 329 publications

(402 citation statements)

References 80 publications

(177 reference statements)

Supporting

Mentioning

360

Contrasting

Unclassified

Order By: Relevance

“…In the Southern Ocean, where N and P are replete and irradiance is moderate, F v /F m is generally linked to iron limitation stress (Hopkinson et al, 2007). In some regions, F v /F m is confounded by taxonomic differences in biophysical properties (Moore et al, 2005;Suggett et al, 2004Suggett et al, , 2009), but iron limitation tends to overwhelm the taxonomic signal in HNLC regions such as the Southern Ocean (Suggett et al, 2009).…”

Section: Ncp Vs Iron Nutritional Statusmentioning

confidence: 99%

The influence of iron and light on net community production in the Subantarctic and Polar Frontal Zones

et al. 2011

View full text Add to dashboard Cite

The roles of iron and light in controlling biomass and primary productivity are clearly established in the Southern Ocean. However, their influence on net community production (NCP) and carbon export remains to be quantified. To improve our understanding of NCP and carbon export production in the Subantarctic Zone (SAZ) and the northern reaches of the Polar Frontal Zone (PFZ), we conducted continuous onboard determinations of NCP as part of the Sub-Antarctic Sensitivity to Environmental Change (SAZ-Sense) study, which occurred in January–February 2007. Biological O2 supersaturation was derived from measuring O2/Ar ratios by equilibrator inlet mass spectrometry. Based on these continuous measurements, NCP during the austral summer 2007 in the Australian SAZ was approximately 43 mmol O2 m−2 d−1. NCP showed significant spatial variability, with larger values near the Subtropical front, and a general southward decrease. For shallower mixed layers (<50 m), dissolved Fe concentrations and Fe sufficiency, estimated from variable fluorescence, correlated strongly with NCP. The strong correlation between NCP and dissolved Fe may be difficult to interpret because of the correlation of dissolved Fe to MLD and because the concentration of iron may not be a good indicator of its availability. At stations with deeper mixed layers, NCP was consistently low, regardless of iron sufficiency, consistent with light availability also being an important control of NCP. Our new observations provide independent evidence for the critical roles of iron and light in mediating carbon export from the Southern Ocean mixed layer

show abstract

Section: Ncp Vs Iron Nutritional Statusmentioning

confidence: 99%

The influence of iron and light on net community production in the Subantarctic and Polar Frontal Zones

et al. 2011

View full text Add to dashboard Cite

show abstract

“…Similarly, significantly lower F v =F m , F v =F o , 1=τ Qa , and higher σ PSII observed in the region north of the APF could have been due to the high abundance of nanophytoplankton in this region. Phytoplankton with smaller cell size have shown to exhibit lower F v =F m and higher σ PSII than larger phytoplankton such as diatoms (Suggett et al, 2009). In this study, nanophytoplankton correlate positively with (DDþ DT)/TChl-a and negatively with F v =F m ( Table 2), suggesting that higher (DD þDT)/TChl-a ratios and lower F v =F m observed in the region north of the APF may be due to the dominance of smaller size phytoplankton in this region.…”

Section: Contrasting Photoacclimation Response In Haptophytes-and Diamentioning

confidence: 99%

Importance of deep mixing and silicic acid in regulating phytoplankton biomass and community in the iron-limited Antarctic Polar Front region in summer

Cheah

Soppa

Wiegmann

et al. 2017

Deep Sea Research Part II: Topical Studies in Oceanography

View full text Add to dashboard Cite

a b s t r a c tPhytoplankton community structure and their physiological response in the vicinity of the Antarctic Polar Front (APF; 44°S to 53°S, centred at 10°E) were investigated as part of the ANT-XXVIII/3 Eddy-Pump cruise conducted in austral summer 2012. Our results show that under iron-limited ð o 0:3 μmol m À 3 Þ conditions, high total chlorophyll-a (TChl-a) concentrations ð 40:6 mg m À 3 Þ can be observed at stations with deep mixed layer ð 4 60 mÞ across the APF. In contrast, light was excessive at stations with shallower mixed layer and phytoplankton were producing higher amounts of photoprotective pigments, diadinoxanthin (DD) and diatoxanthin (DT), at the expense of TChl-a, resulting in higher ratios of (DD þDT)/ TChl-a. North of the APF, significantly lower silicic acid (Si(OH) 4 ) concentrations ð o 2 mmol m À 3 Þ lead to the domination of nanophytoplankton consisting mostly of haptophytes, which produced higher ratios of (DD þDT)/TChl-a under relatively low irradiance conditions. The Si(OH) 4 replete ð 4 5 mmol m À 3 Þ region south of the APF, on the contrary, was dominated by microphytoplankton (diatoms and dinoflagellates) with lower ratios of (DD þDT)/TChl-a, despite having been exposed to higher levels of irradiance. The significant correlation between nanophytoplankton and (DD þDT)/TChl-a indicates that differences in taxon-specific response to light are also influencing TChl-a concentration in the APF during summer. Our results reveal that provided mixing is deep and Si(OH) 4 is replete, TChl-a concentrations higher than 0:6 mg m À 3 are achievable in the iron-limited APF waters during summer.

show abstract

“…This Fe-efficient strategy appears to be 124 most pronounced for Southern Ocean diatoms, which, in culture can have some of the 125 largest light harvesting antennae reported (Strzepek et al, 2012), a phenotype which is 126 more commonly associated with small cells (Suggett et al, 2009 long-term (168 h) incubation experiments were performed (Fig. 1a).…”

mentioning

confidence: 99%

Temporal progression of photosynthetic-strategy in phytoplankton in the Ross Sea, Antarctica

Ryan‐Keogh

DeLizo

Smith

et al. 2017

Journal of Marine Systems

View full text Add to dashboard Cite

show abstract

Interpretation of fast repetition rate (FRR) fluorescence: signatures of phytoplankton community structure versus physiological state

Cited by 329 publications

References 80 publications

The influence of iron and light on net community production in the Subantarctic and Polar Frontal Zones

The influence of iron and light on net community production in the Subantarctic and Polar Frontal Zones

Importance of deep mixing and silicic acid in regulating phytoplankton biomass and community in the iron-limited Antarctic Polar Front region in summer

Temporal progression of photosynthetic-strategy in phytoplankton in the Ross Sea, Antarctica

Contact Info

Product

Resources

About