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Physical-Biological Coupling in the Western South China Sea: The Response of Phytoplankton Community to a Mesoscale Cyclonic Eddy.

Wang L, Huang B, Chiang KP, Liu X, Chen B, Xie Y, Xu Y, Hu J, Dai M - PLoS ONE (2016)

Bottom Line: However the TChl a biomass in the surface layer (at 5 m) in the eddy center was promoted 2.6-fold compared to the biomass outside the eddy (p < 0.001).The TChl a biomass for most of the phytoplankton groups increased at the surface layer in the eddy center under the effect of nutrient pumping.So the slight increasing in the water column integrated phytoplankton biomass might be attributed to the stimulated phytoplankton biomass at the surface layer.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of the Coastal and Wetland Ecosystems, the Ministry of Education, Xiamen University, Xiamen, China.

ABSTRACT
It is widely recognized that the mesoscale eddies play an important part in the biogeochemical cycle in ocean ecosystem, especially in the oligotrophic tropical zones. So here a heterogeneous cyclonic eddy in its flourishing stage was detected using remote sensing and in situ biogeochemical observation in the western South China Sea (SCS) in early September, 2007. The high-performance liquid chromatography method was used to identify the photosynthetic pigments. And the CHEMical TAXonomy (CHEMTAX) was applied to calculate the contribution of nine phytoplankton groups to the total chlorophyll a (TChl a) biomass. The deep chlorophyll a maximum layer (DCML) was raised to form a dome structure in the eddy center while there was no distinct enhancement for TChl a biomass. The integrated TChl a concentration in the upper 100 m water column was also constant from the eddy center to the surrounding water outside the eddy. However the TChl a biomass in the surface layer (at 5 m) in the eddy center was promoted 2.6-fold compared to the biomass outside the eddy (p < 0.001). Thus, the slight enhancement of TChl a biomass of euphotic zone integration within the eddy was mainly from the phytoplankton in the upper mixed zone rather than the DCML. The phytoplankton community was primarily contributed by diatoms, prasinophytes, and Synechococcus at the DCML within the eddy, while less was contributed by haptophytes_8 and Prochlorococcus. The TChl a biomass for most of the phytoplankton groups increased at the surface layer in the eddy center under the effect of nutrient pumping. The doming isopycnal within the eddy supplied nutrients gently into the upper mixing layer, and there was remarkable enhancement in phytoplankton biomass at the surface layer with 10.5% TChl a biomass of water column in eddy center and 3.7% at reference stations. So the slight increasing in the water column integrated phytoplankton biomass might be attributed to the stimulated phytoplankton biomass at the surface layer.

No MeSH data available.


Related in: MedlinePlus

The water column integrated phytoplankton group composition in term of group-average TChl a biomass within the euphotic zone [mg m-3].The group OUT was treated as the control in the multiple comparison using one-way ANOVA. * implied significantly different in the level of p<0.050, ** for p<0.010 and *** for p<0.001.
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pone.0153735.g007: The water column integrated phytoplankton group composition in term of group-average TChl a biomass within the euphotic zone [mg m-3].The group OUT was treated as the control in the multiple comparison using one-way ANOVA. * implied significantly different in the level of p<0.050, ** for p<0.010 and *** for p<0.001.

Mentions: Because the patterns of TChl a biomass at the surface layer were not consistent with those integrated over the water column, TChl a integrated over the euphotic layer was estimated and the depth-average value of TChl a inventory was calculated to eliminate the difference of euphotic depth. For IN and EDGE, the Zeu integrated TChl a biomass was ~95% and ~86% of biomass integrated over the upper 100 m. For the Zeu integration average, 22% for IN and 12% for EDGE TChl a biomass enhancement was obvious but had no significant difference (p>0.050). The growth or decline for each community group was similar as the upper 100 m water column integration (Fig 7).


Physical-Biological Coupling in the Western South China Sea: The Response of Phytoplankton Community to a Mesoscale Cyclonic Eddy.

Wang L, Huang B, Chiang KP, Liu X, Chen B, Xie Y, Xu Y, Hu J, Dai M - PLoS ONE (2016)

The water column integrated phytoplankton group composition in term of group-average TChl a biomass within the euphotic zone [mg m-3].The group OUT was treated as the control in the multiple comparison using one-way ANOVA. * implied significantly different in the level of p<0.050, ** for p<0.010 and *** for p<0.001.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4835056&req=5

pone.0153735.g007: The water column integrated phytoplankton group composition in term of group-average TChl a biomass within the euphotic zone [mg m-3].The group OUT was treated as the control in the multiple comparison using one-way ANOVA. * implied significantly different in the level of p<0.050, ** for p<0.010 and *** for p<0.001.
Mentions: Because the patterns of TChl a biomass at the surface layer were not consistent with those integrated over the water column, TChl a integrated over the euphotic layer was estimated and the depth-average value of TChl a inventory was calculated to eliminate the difference of euphotic depth. For IN and EDGE, the Zeu integrated TChl a biomass was ~95% and ~86% of biomass integrated over the upper 100 m. For the Zeu integration average, 22% for IN and 12% for EDGE TChl a biomass enhancement was obvious but had no significant difference (p>0.050). The growth or decline for each community group was similar as the upper 100 m water column integration (Fig 7).

Bottom Line: However the TChl a biomass in the surface layer (at 5 m) in the eddy center was promoted 2.6-fold compared to the biomass outside the eddy (p < 0.001).The TChl a biomass for most of the phytoplankton groups increased at the surface layer in the eddy center under the effect of nutrient pumping.So the slight increasing in the water column integrated phytoplankton biomass might be attributed to the stimulated phytoplankton biomass at the surface layer.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of the Coastal and Wetland Ecosystems, the Ministry of Education, Xiamen University, Xiamen, China.

ABSTRACT
It is widely recognized that the mesoscale eddies play an important part in the biogeochemical cycle in ocean ecosystem, especially in the oligotrophic tropical zones. So here a heterogeneous cyclonic eddy in its flourishing stage was detected using remote sensing and in situ biogeochemical observation in the western South China Sea (SCS) in early September, 2007. The high-performance liquid chromatography method was used to identify the photosynthetic pigments. And the CHEMical TAXonomy (CHEMTAX) was applied to calculate the contribution of nine phytoplankton groups to the total chlorophyll a (TChl a) biomass. The deep chlorophyll a maximum layer (DCML) was raised to form a dome structure in the eddy center while there was no distinct enhancement for TChl a biomass. The integrated TChl a concentration in the upper 100 m water column was also constant from the eddy center to the surrounding water outside the eddy. However the TChl a biomass in the surface layer (at 5 m) in the eddy center was promoted 2.6-fold compared to the biomass outside the eddy (p < 0.001). Thus, the slight enhancement of TChl a biomass of euphotic zone integration within the eddy was mainly from the phytoplankton in the upper mixed zone rather than the DCML. The phytoplankton community was primarily contributed by diatoms, prasinophytes, and Synechococcus at the DCML within the eddy, while less was contributed by haptophytes_8 and Prochlorococcus. The TChl a biomass for most of the phytoplankton groups increased at the surface layer in the eddy center under the effect of nutrient pumping. The doming isopycnal within the eddy supplied nutrients gently into the upper mixing layer, and there was remarkable enhancement in phytoplankton biomass at the surface layer with 10.5% TChl a biomass of water column in eddy center and 3.7% at reference stations. So the slight increasing in the water column integrated phytoplankton biomass might be attributed to the stimulated phytoplankton biomass at the surface layer.

No MeSH data available.


Related in: MedlinePlus