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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

Vertical distribution of hydrologic parameters, nutrients and in situ fluorescence along the Y0 during the cruise.(A) Temperature [°C], (B) Salinity, (C) potential density anomaly [kg m-3], (D) fluorescence [relative units]. The bright contour denotes the euphotic depth [m], and the gray one denotes the mixed layer depth [m].
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pone.0153735.g004: Vertical distribution of hydrologic parameters, nutrients and in situ fluorescence along the Y0 during the cruise.(A) Temperature [°C], (B) Salinity, (C) potential density anomaly [kg m-3], (D) fluorescence [relative units]. The bright contour denotes the euphotic depth [m], and the gray one denotes the mixed layer depth [m].

Mentions: In order to better understand the impact of nutrients pumping on phytoplankton community composition in the cyclonic eddy, the vertical distribution of phytoplankton and related environment parameters along Transect Y1 were presented. There was a dome structure at the center of C2 according to the vertical distribution of the temperature, salinity and density along Transect Y1 (Fig 4A, 4B and 4C). The Chl a largely followed the doming isopycnal in vertical (Fig 4D). The DCML was almost coincided with the isopycnal of 22.0 kg m-3, where was the top of the nutricline. The DCML was at about 50 m at the eddy edges and deeper than 75 m outside the eddy, and was uplifted to about 25 m at the center. In Transect Y1, the TChl a maximums at the DCML exceeded 0.740 mg m-3 at the center and edge, which was higher than the stations outside the eddy (0.551 mg m-3). In contrast, The TChl a concentration was low and fairly uniform below the DCML (Figs 4D and 5A).


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)

Vertical distribution of hydrologic parameters, nutrients and in situ fluorescence along the Y0 during the cruise.(A) Temperature [°C], (B) Salinity, (C) potential density anomaly [kg m-3], (D) fluorescence [relative units]. The bright contour denotes the euphotic depth [m], and the gray one denotes the mixed layer depth [m].
© Copyright Policy
Related In: Results  -  Collection

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

pone.0153735.g004: Vertical distribution of hydrologic parameters, nutrients and in situ fluorescence along the Y0 during the cruise.(A) Temperature [°C], (B) Salinity, (C) potential density anomaly [kg m-3], (D) fluorescence [relative units]. The bright contour denotes the euphotic depth [m], and the gray one denotes the mixed layer depth [m].
Mentions: In order to better understand the impact of nutrients pumping on phytoplankton community composition in the cyclonic eddy, the vertical distribution of phytoplankton and related environment parameters along Transect Y1 were presented. There was a dome structure at the center of C2 according to the vertical distribution of the temperature, salinity and density along Transect Y1 (Fig 4A, 4B and 4C). The Chl a largely followed the doming isopycnal in vertical (Fig 4D). The DCML was almost coincided with the isopycnal of 22.0 kg m-3, where was the top of the nutricline. The DCML was at about 50 m at the eddy edges and deeper than 75 m outside the eddy, and was uplifted to about 25 m at the center. In Transect Y1, the TChl a maximums at the DCML exceeded 0.740 mg m-3 at the center and edge, which was higher than the stations outside the eddy (0.551 mg m-3). In contrast, The TChl a concentration was low and fairly uniform below the DCML (Figs 4D and 5A).

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