Effects of phytoplankton community composition and productivity on sea surface pCO2 variations in the Southern Ocean

Abstract. Phytoplankton population dynamics play an important role in biogeochemical cycles in the Southern Ocean during austral summer. Recent environmental changes such as a rise in sea surface temperature (SST) are likely to impact on net primary productivity (NPP) and phytoplankton community composition. However, their spatiotemporal relationships are still unclear in the Southern Ocean. Here we assessed the relationships between NPP, dominant phytoplankton groups, and SST in the Indian sector of the Southern Ocean over the past decade (1997–2007) using satellite remote sensing data. As a result, we found a statistically significant reduction in NPP in the polar frontal zone over the past decade during austral summer. Moreover, the decrease in NPP positively correlated with the dominance of diatoms (Kendall's rank correlation τ = 0.60) estimated by a phytoplankton community composition model, but not correlated with SST. In the seasonal ice zone, NPP correlated with not only the dominance of diatoms positively (τ = 0.56), but also the dominance of haptophytes (τ = −0.54) and SST (τ = −0.54) negatively. Our results suggested that summer NPP values were strongly affected by the phytoplankton community composition in the Indian sector of the Southern Ocean.

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The relation of mixed-layer net community production to phytoplankton community composition in the Southern Ocean

Global Biogeochemical Cycles ◽

10.1002/2014gb004936 ◽

2015 ◽

Vol 29 (4) ◽

pp. 446-462 ◽

Cited By ~ 20

Author(s):

Nicolas Cassar ◽

Simon W. Wright ◽

Paul G. Thomson ◽

Thomas W. Trull ◽

Karen J. Westwood ◽

...

Keyword(s):

Southern Ocean ◽

Community Composition ◽

Mixed Layer ◽

Phytoplankton Community ◽

Net Community Production ◽

Phytoplankton Community Composition ◽

Community Production

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Variations of net primary productivity and phytoplankton community composition in the Southern Ocean as estimated from ocean-color remote sensing data

Biogeosciences Discussions ◽

10.5194/bgd-9-4361-2012 ◽

2012 ◽

Vol 9 (4) ◽

pp. 4361-4398 ◽

Cited By ~ 1

Author(s):

S. Takao ◽

T. Hirawake ◽

S. W. Wright ◽

K. Suzuki

Keyword(s):

Remote Sensing ◽

Southern Ocean ◽

Community Composition ◽

Primary Productivity ◽

Phytoplankton Community ◽

Net Primary Productivity ◽

Austral Summer ◽

Remote Sensing Data ◽

The Past ◽

Phytoplankton Community Composition

Abstract. Phytoplankton population dynamics play an important role in biogeochemical cycles in the Southern Ocean during austral summer. Recent environmental changes such as a rise in sea surface temperature (SST) are likely to impact on net primary productivity (NPP) and phytoplankton community composition. However, their spatiotemporal relationships are still unclear in the Southern Ocean. Here we assessed the relationships between NPP, dominant phytoplankton groups, and SST in the Indian sector of the Southern Ocean over the past decade (1997–2007) using satellite remote sensing data. As a result, we found a statistically significant reduction in NPP in the polar frontal zone over the past decade during austral summer. Moreover, the decrease in NPP positively correlated with the dominance of diatoms (Kendall's rank correlation τ = 0.60) estimated by a phytoplankton community composition model, but not correlated with SST. In the seasonal ice zone, NPP correlated with not only the dominance of diatoms positively (τ = 0.56), but also the dominance of haptophytes (τ = −0.54) and SST (τ = −0.54) negatively. Our results suggested that summer NPP values were strongly affected by the phytoplankton community composition in the Southern Ocean.

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Links Between the Phytoplankton Community Composition and Trace Metal Distribution in Summer Surface Waters of the Atlantic Southern Ocean

Frontiers in Marine Science ◽

10.3389/fmars.2019.00295 ◽

2019 ◽

Vol 6 ◽

Cited By ~ 1

Author(s):

Johannes J. Viljoen ◽

Ian Weir ◽

Susanne Fietz ◽

Ryan Cloete ◽

Jean Loock ◽

...

Keyword(s):

Southern Ocean ◽

Trace Metal ◽

Community Composition ◽

Surface Waters ◽

Phytoplankton Community ◽

Metal Distribution ◽

Phytoplankton Community Composition ◽

Trace Metal Distribution

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Are Bacterio- and Phytoplankton Community Compositions Related in Lakes Differing in Their Cyanobacteria Contribution and Physico-Chemical Properties?

Genes ◽

10.3390/genes12060855 ◽

2021 ◽

Vol 12 (6) ◽

pp. 855

Author(s):

Mikołaj Kokociński ◽

Dariusz Dziga ◽

Adam Antosiak ◽

Janne Soininen

Keyword(s):

Environmental Factors ◽

Community Composition ◽

Phytoplankton Community ◽

Heterotrophic Bacteria ◽

Bacterial Community Composition ◽

Physical Factors ◽

Research Attention ◽

Phytoplankton Community Composition ◽

The Impact ◽

Bacteria Communities

Bacterioplankton community composition has become the center of research attention in recent years. Bacteria associated with toxic cyanobacteria blooms have attracted considerable interest. However, little is known about the environmental factors driving the bacteria community, including the impact of invasive cyanobacteria. Therefore, our aim has been to determine the relationships between heterotrophic bacteria and phytoplankton community composition across 24 Polish lakes with different contributions of cyanobacteria including the invasive species Raphidiopsis raciborskii. This analysis revealed that cyanobacteria were present in 16 lakes, while R. raciborskii occurred in 14 lakes. Our results show that bacteria communities differed between lakes dominated by cyanobacteria and lakes with minor contributions of cyanobacteria but did not differ between lakes with R. raciborskii and other lakes. Physical factors, including water and Secchi depth, were the major drivers of bacteria and phytoplankton community composition. However, in lakes dominated by cyanobacteria, bacterial community composition was also influenced by biotic factors such as the amount of R. raciborskii, chlorophyll-a and total phytoplankton biomass. Thus, our study provides novel evidence on the influence of environmental factors and R. raciborskii on lake bacteria communities.

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