Some ecophysiological aspects of the Antarctic phytoplankton

Jacques, Guy

doi:10.1007/bf00258282

Cited by 196 publications

(102 citation statements)

References 17 publications

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“…The actual data are given in Figueiras et al (1998). The range of the broadband photosynthetic parameters (P , ␣ B , and B m E kPAR ) was similar to that found in the area previously (e.g., Jacques 1983;Figueiras et al 1994;Boyd et al 1995 , P ϭ 0.6). Figueiras et al (1998) showed that the maximum photosynthetic rate (P ) and the broadband initial authors showed that the mean irradiance in the upper mixed layer (E umlPAR ) was not statistically different from the mean light saturation parameter (E kPAR ), and these differences were even less when stations with an upper mixed layer Ն150 m were not considered (t-test NS, P ϭ 0.83, see also Table 1).…”

Section: Hydrographic Regions and Phytoplankton Composition-supporting

confidence: 77%

Implications of bio‐optical modeling of phytoplankton photosynthesis in Antarctic waters: Further evidence of no light limitation in the Bransfield Strait

Figueiras

Arbones

Estrada

1999

Limnology & Oceanography

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During the cruise ECOANTAR 94 photosynthesis versus irradiance relationships, phytoplankton spectral absorption, quantum yield of carbon fixation, and water column light regime were determined in the eastern Bransfield Strait and surrounding areas of the Weddell Sea and Weddell-Scotia Confluence, to determine if photosynthesis is light limited in these areas. There were no significant differences in the light-saturated chlorophyll-specific rate of photosynthesis (P ), light-limited slope (␣ B ), light saturation parameter (E kPAR ), and the maximum quantum yield B m ( m ) between surface and subsurface water for several water masses in the area, which indicates that the photosynthetic response in the upper mixed layer was uniform. There were also no significant differences between the spectral light saturation parameter (E kPUR ) and the mean absorbed irradiance by phytoplankton in the upper mixed layer (E umlPUR ). These similarities suggest that phytoplankton photosynthesis was not light limited in this Antarctic region during the cruise period. This was also affirmed by the fact that the average operational quantum yield of the water column (0.03 mol C [mol photons] Ϫ1 ) was half of the mean maximum quantum yield (0.06 mol C [mol photons] Ϫ1 ). Primary production is underestimated by 24% when broadband models are compared with spectral ones. These results have important implications for the modeling of carbon flows in the Southern Ocean.

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Section: Hydrographic Regions and Phytoplankton Composition-supporting

confidence: 77%

Implications of bio‐optical modeling of phytoplankton photosynthesis in Antarctic waters: Further evidence of no light limitation in the Bransfield Strait

Figueiras

Arbones

Estrada

1999

Limnology & Oceanography

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“…Therefore, most authors have ruled out the possibility of nutrient limitation of phytoplankton. This conclusion was made before Jacques (1983) and Sommer (1986) published half-saturation constants at 0°C temperatures which were much higher than half-saturation constants at temperatures >0°C, the highest being a k s , of 88.7 u-M for Nitzschia kerguelensis and a & N of 4.2 (xM for Nitzschia cylindrus. Such high concentrations would not be limiting under wanner conditions.…”

Section: Introductionmentioning

confidence: 74%

“…Such high concentrations would not be limiting under wanner conditions. The suggestion of potential nutrient limitation in the Antarctic Sea by Jacques (1983) and Sommer (1986) was based on the Monod model, which makes the growth rate a function of the dissolved nutrient concentration. This model has frequently been criticized because of its dependence of chemostat-like equilibrium conditions (Goldman etal., 1979;Harris, 1986).…”

Section: Introductionmentioning

confidence: 99%

Comparative nutrient status and competitive interactions of two Antarctic diatoms (Corethron criophilum and Thalassiosira antarctica)

Sommer¹

1991

J Plankton Res

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Abstract. The nutrient status of two common Antarctic diatoms {Corethron cnophdum and Thalassiosira cf. antarctica) was analysed by studying the growth response in enrichment bioassays and by estimates of the cell quotas of Si, N and P after size-fractionation of net plankton samples Corthron had higher biomass-specific N-quotas; Si-and P-quotas were quite similar between both species. Corethron was Si-limited in five enrichment experiments and not nutrient limited in five experiments. Thalassiosira was not nutrient limited in six experiments, N-hmited in four experiments and Si-limited in one experiment Droop-kinetics of Si-limited growth of Corethron and of N-hmited growth of Thalassiosira were obtained by combining the growth rates in the bioassays and the cell quotas from the natural populations. The minimal Si-quota of Corethron was 0 041 mol Si/mol C, the saturating cell quota was 0.158 mol Si/mol C respectively The minimal N-quota of Thalassiosira was 0 0223 mol N/mol C, the saturating cell quota was 0.208 mol N/mol C Corethron was N-saturated at cell quotas of >0 106 mol N/mol C; Thalassiosira was Si-saturated at cell quotas of >0 132 mol Si/ mol C. As the better competitor for N and the poorer one for Si, Corethron became more important with increasing Si N ratios, while Thalassiosira became more important with decreasing Si:N ratios in the water

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“…Slightly increased numbers and carbon biomass (the latter especially at 55øS, 143øE) of heterotrophic dinoflagellates suggest the latter process. The very low silica concentrations found along the transect were probably limiting for diatom growth [Jacques, 1983] for some time preceding sampling. Thus we have phytoplankton in a near-bloom situation in the north thriving under ammonium-based regenerative production at the STF, while farther south in the SAZ and PFZ the relative importance of new production is higher and reaches a maximum at 45ø-46øS, possibly supported there by iron supply.…”

Section: Physicochemical Datamentioning

confidence: 99%

Phytoplankton and microzooplankton variability between the Subtropical and Polar Fronts south of Australia: Thriving under regenerative and new production in late summer

Kopczyńska¹,

Dehairs²,

Elskens³

et al. 2001

J. Geophys. Res.

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Production related parameters (e.g., lowf ratio and high NH4 + uptake) point to the presence of regenerative community at the STF. It attracted the highest concentration of microzooplankton. The phytoplankton community associated with a frontal feature (46ø-47øS) within the SAZ, thrived under increased new production (e.g., relatively higherf ratio and NO3-uptake). The community along 47ø-55øS was characterized by intermediatef ratios, with slight predominance of regenerated production. Southward of 47øS, the relative contribution of new production increased.

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Some ecophysiological aspects of the Antarctic phytoplankton

Cited by 196 publications

References 17 publications

Implications of bio‐optical modeling of phytoplankton photosynthesis in Antarctic waters: Further evidence of no light limitation in the Bransfield Strait

Implications of bio‐optical modeling of phytoplankton photosynthesis in Antarctic waters: Further evidence of no light limitation in the Bransfield Strait

Comparative nutrient status and competitive interactions of two Antarctic diatoms (Corethron criophilum and Thalassiosira antarctica)

Phytoplankton and microzooplankton variability between the Subtropical and Polar Fronts south of Australia: Thriving under regenerative and new production in late summer

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