Dynamics of transparent exopolymeric particles (TEP) and particle-associated carbohydrates in the Dona Paula bay, west coast of India

Bhaskar, P.V.; Bhosle, N.B.

doi:10.1007/bf02702869

Cited by 27 publications

(22 citation statements)

References 46 publications

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“…The TEP levels we measured at the SWAS are generally within the range of those reported for coastal areas Riebesell et al, 1995;Kiorboe et al, 1996;Hong et al, 1997;Jähmlich et al, 1998;Wild, 2000;Ramaiah et al, 2001;Engel et al, 2002b;García et al, 2002;Radic et al, 2005;Scoullos et al, 2006;Sugimoto et al, 2007;Harlay et al, 2009Harlay et al, , 2010Wurl et al, 2009;Fukao et al, 2011;Klein et al, 2011;Sun et al, 2012;Van Oostende et al, 2012;Dreshchinskii and Engel, 2017;Jennings et al, 2017). Only two studies, in the western Baltic Sea and the Dona Paula Bay (Arabian Sea), reported TEP levels higher than ours (Engel, 2000;Bhaskar and Bhosle, 2006).…”

Section: Teps Across the Surface Atlantic Oceansupporting

confidence: 83%

“…A previous study in a eutrophic system reported TEP-C as the dominant POC contributor (Yamada et al, 2015), whereas others found that phyto-C represented the largest share to POC compared to TEP-C and HP-C (Bhaskar and Bhosle, 2006;Ortega-Retuerta et al, 2009b;de Vicente et al, 2010). With our results taken all together, we hypothesize that in oligotrophic conditions TEP-C is the predominant POC fraction, because nutrient limitation favors TEP production by phytoplankton and limits TEP consumption by bacteria.…”

Section: Teps As An Important Contributor To Ocean Surface Pocmentioning

confidence: 97%

“…The aforementioned importance of TEPs in carbon fluxes in the pelagic ocean can be further stressed by considering the following rough numbers: if the percentage of extracellular carbon release during planktonic primary production is generally constrained within 10 %-20 % (Nagata, 2000;Mari et al, 2017), but can reach > 50 % (López-Sandoval et al, 2011), and half of the extracellular release is in the form of reactive polysaccharides (Biddanda and Benner, 1997), then the production rate of TEP precursors may represent 5 %-10 %, but can reach > 25 % of planktonic primary production, without considering production by heterotrophs. This calls for the need to quantify their occurrence across the oceans, elucidate their main distribution drivers and determine their contribution to the organic carbon reservoir.…”

Section: Introductionmentioning

confidence: 99%

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Main drivers of transparent exopolymer particle distribution across the surface Atlantic Ocean

Zamanillo¹,

Ortega−Retuerta

Nunes³

et al. 2019

Biogeosciences

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Abstract. Transparent exopolymer particles (TEPs) are a class of gel particles, produced mainly by microorganisms, which play important roles in biogeochemical processes such as carbon cycling and export. TEPs (a) are colonized by carbon-consuming microbes; (b) mediate aggregation and sinking of organic matter and organisms, thereby contributing to the biological carbon pump; and (c) accumulate in the surface microlayer (SML) and affect air–sea gas exchange. The first step to evaluate the global influence of TEPs in these processes is the prediction of TEP occurrence in the ocean. Yet, little is known about the physical and biological variables that drive their abundance, particularly in the open ocean. Here we describe the horizontal TEP distribution, along with physical and biological variables, in surface waters along a north–south transect in the Atlantic Ocean during October–November 2014. Two main regions were separated due to remarkable differences: the open Atlantic Ocean (OAO, n=30), and the Southwestern Atlantic Shelf (SWAS, n=10). TEP concentration in the entire transect ranged 18.3–446.8 µg XG eq L−1 and averaged 117.1±119.8 µg XG eq L−1, with the maximum concentrations in the SWAS and in a station located at the edge of the Canary Coastal Upwelling (CU), and the highest TEP to chlorophyll a (TEP:Chl a) ratios in the OAO (183±56) and CU (1760). TEPs were significantly and positively related to Chl a and phytoplankton biomass, expressed in terms of C, along the entire transect. In the OAO, TEPs were positively related to some phytoplankton groups, mainly Synechococcus. They were negatively related to the previous 24 h averaged solar irradiance, suggesting that sunlight, particularly UV radiation, is more a sink than a source for TEP. Multiple regression analyses showed the combined positive effect of phytoplankton and heterotrophic prokaryotes (HPs) on TEP distribution in the OAO. In the SWAS, TEPs were positively related to high nucleic acid-containing prokaryotic cells and total phytoplankton biomass, but not to any particular phytoplankton group. Estimated TEP–carbon constituted an important portion of the particulate organic carbon pool in the entire transect (28 %–110 %), generally higher than the phytoplankton and HP carbon shares, which highlights the importance of TEPs in the cycling of organic matter in the ocean.

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Section: Teps Across the Surface Atlantic Oceansupporting

confidence: 83%

Section: Teps As An Important Contributor To Ocean Surface Pocmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Main drivers of transparent exopolymer particle distribution across the surface Atlantic Ocean

Zamanillo¹,

Ortega−Retuerta

Nunes³

et al. 2019

Biogeosciences

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“…For these reasons, the direct transposition of such a relationship to estimates of CaCO 3 dissolution rates in the field was not possible from our data-set. The contribution of TEP-C to the POC in the top 40 m averaged 26 ± 4% (n = 31), which is higher than previous estimates in the same area (12%; Harlay et al, 2009), along a transect in the northeast North Atlantic (17 ± 7%; Engel, 2004), and in the Bay of Bengal (7%; Bhaskar and Bhosle, 2006).…”

contrasting

confidence: 42%

Biogeochemical study of a coccolithophore bloom in the northern Bay of Biscay (NE Atlantic Ocean) in June 2004

Harlay

Borges

Zee

et al. 2010

Progress in Oceanography

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a b s t r a c tThe present paper synthesizes data obtained during a multidisciplinary cruise carried out in June 2004 at the continental margin of the northern Bay of Biscay. The data-set allows to describe the different stages of a coccolithophore bloom dominated by Emiliania huxleyi. The cruise was carried out after the main spring phytoplankton bloom that started in mid-April and peaked in mid-May. Consequently, low phosphate (PO 4 < 0.2 lM) and silicate (DSi < 2.0 lM) concentrations, low partial pressure of carbon dioxide (pCO 2 ) and high calcite saturation degree in surface waters combined with thermal stratification, probably favoured the blooming of coccolithophores. During the period of the year our cruise was carried out, internal tides induce enhanced vertical mixing at the continental shelf break leading to the injection of inorganic nutrients to surface waters that probably trigger the bloom. The bloom developed as the water-column stratified and as the water mass was advected over the continental shelf, following the general residual circulation in the area. The most developed phase of the bloom was sampled in a remote sensed high reflectance (HR) patch over the continental shelf that was characterized by low chlorophyll-a Bacterial protein production (BPP) measurements in surface waters (0.3-0.7 lg C L À1 h À1 ) were much higher than those reported during early phases of coccolithophore blooms in natural conditions, but similar to those during peak and declining coocolithophorid blooms reported in mesocosms. Total alkalinity anomalies with respect to conservative mixing (DTA) down to À49 lmol kg À1 are consistent with the occurrence of biogenic precipitation of calcite, while pCO 2 remained 15-107 latm lower than atmospheric equilibrium (372 latm). The correlation between DTA and pCO 2 suggested that pCO 2 increased in part due to calcification, but this increase was insufficient to overcome the background under-saturation of CO 2 . This is related to the biogeochemical history of the water masses due to net carbon fixation by the successive phytoplankton blooms in the area prior to the cruise, hence, the investigated area remained a sink for atmospheric CO 2 despite calcification.

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“…The TEP levels we measured at the SWAS are generally within the range of those reported for coastal areas (Passow and Alldredge, 1995;Riebesell et al, 1995;Kiorboe et al, 1996;Hong et al, 1997;Jähmlich et al, 1998;Wild, 2000;Ramaiah et al, 2001;Engel et al, 2002b;García et al, 2002;Radic et al, 2005;Scoullos et al, 2006;Sugimoto et al, 2007;Harlay et al, 2009;Wurl et al, 2009;Harlay et al, 2010;Fukao et al, 2011;Klein et al, 2011;Sun et al, 2012;Van Oostende et al, 2012;Dreshchinskii and Engel, 2017;Jennings et al, 2017). Only two studies, in the western Baltic Sea and the Dona Paula Bay (Arabian Sea), reported TEP levels higher than ours (Engel, 2000;Bhaskar and Bhosle, 2006).…”

Section: )supporting

confidence: 83%

Main drivers of transparent exopolymer particle distribution across the surface Atlantic Ocean

Zamanillo¹,

Ortega-Retuerta²,

Nunes³

et al. 2018

Preprint

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Abstract. Transparent exopolymer particles (TEP) are a class of gel particles produced mainly by microorganisms. TEP play an important role in the ocean carbon cycle, affect sea&#8211;air gas exchange and contribute to organic aerosols. The first step to evaluate the TEP influence in these processes is the prediction of TEP occurrence in the ocean. Yet, little is known about the physical and biological variables that control their abundance, particularly in the open ocean. Here we describe horizontal TEP distribution in the surface waters along a North&#8211;South transect in the Atlantic Ocean during October&#8211;November 2014. Physical and biological variables were run in parallel. Two main regions were separated due to remarkable differences; the open Atlantic Ocean (OAO, n&#8201;=&#8201;30), and the Southwestern Atlantic Shelf (SWAS, n&#8201;=&#8201;10). TEP concentration in the entire transect ranged from 18.3 to 446.8&#8201;&#181;g XG&#8201;eq&#8201;L&#8722;1 and averaged 117.1&#8201;&#177;&#8201;119.8&#8201;&#181;g XG&#8201;eq&#8201;L&#8722;1, with the maximum concentrations in the edge of the Canary Coastal Upwelling (CU, n&#8201;=&#8201;1) and the SWAS, but with the highest TEP to chlorophyll a (TEP&#8201;:&#8201;Chl a) ratios at the OAO (CU excluded, average 183&#8201;&#177;&#8201;56) and CU (1760.4). TEP were significantly and positively related to Chl a and phytoplankton biomass, expressed in terms of C, along the entire transect. In the OAO, TEP were positively related to some phytoplankton groups, mainly to Synechococcus, and negatively related to the previous 24&#8211;hours averaged solar radiation, suggesting the predominance of TEP breaking above the induction of TEP production by UV radiation. Multiple regression analyses showed the combined positive effect of phytoplankton and heterotrophic prokaryotes (HP) on TEP distribution in this region. In the SWAS, TEP were positively related to high nucleic acid prokaryotic cells (HNA) and total phytoplankton biomass, but not with any particular phytoplankton group. TEP constituted an important portion of the particulate organic carbon (POC) pool in the entire transect (28.1&#8211;109.8&#8201;%), and was generally higher than the phytoplankton and HP fraction, highlighting the importance of TEP in the cycle of organic matter in the ocean.

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Dynamics of transparent exopolymeric particles (TEP) and particle-associated carbohydrates in the Dona Paula bay, west coast of India

Cited by 27 publications

References 46 publications

Main drivers of transparent exopolymer particle distribution across the surface Atlantic Ocean

Main drivers of transparent exopolymer particle distribution across the surface Atlantic Ocean

Biogeochemical study of a coccolithophore bloom in the northern Bay of Biscay (NE Atlantic Ocean) in June 2004

Main drivers of transparent exopolymer particle distribution across the surface Atlantic Ocean

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