Seagrass as major source of transparent exopolymer particles in the oligotrophic Mediterranean coast

Iuculano, Francesca; Duarte, Carlos M.; Marbà, Núria; Agustı́, Susana

doi:10.5194/bg-14-5069-2017

Cited by 10 publications

(23 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The TEP concentrations that we measured across the OAO (CU included) generally fall within the range reported in other studies from the open ocean (Table 2). However, our levels are higher than those observed in the Mediterranean Sea , Pacific Ocean (Ramaiah et al, 2005;Kodama et al, 2014;Iuculano et al, 2017b) and one study in the northwestern Atlantic Ocean (Cisternas-Novoa et al, 2015), and lower than that reported in the eastern Mediterranean Sea (Bar-Zeev et al, 2011). We believe that one of the reasons for the higher values found in our study compared with these previous studies is the depth.…”

Section: Teps Across the Surface Atlantic Oceancontrasting

confidence: 87%

“…Chl a concentration in the OAO (0.4 ± 0.2 mg m −3 (0.2-0.6 mg m −3 )) was generally higher than in the other studies referred in the Table 2. For example, in Iuculano et al (2017b) Chl a ranged 0.05-0.31 mg m −3 , and in Kodama et al (2014) it averaged 0.05 ± 0.01 mg m −3 . We also cannot discard the possibility that differences in TEP chemical composition could cause differences in staining capacity.…”

Section: Teps Across the Surface Atlantic Oceanmentioning

confidence: 96%

“…Some phytoplankton groups that have been shown to produce TEPs include cyanobacteria (Grossart et al, 1998;Mazuecos, 2015;Deng et al, 2016); diatoms (Passow and Alldredge, 1994;Mari and Kiorboe, 1996;Passow, 2002b); dinoflagellates (Passow and Alldredge, 1994); Prymnesiophyceae, including coccolithophores (Riebesell et al, 1995;Engel, 2004;Leblanc et al, 2009); and Cryptomonads . Other organisms such as Posidonia oceanica (Iuculano et al, 2017a), zooplankton (Passow and Alldredge, 1999;Prieto et al, 2001) and benthic suspension feeders (Heinonen et al, 2007) have also been identified as TEP producers.…”

Section: Introductionmentioning

confidence: 99%

“…TEP sources and sinks in the ocean depend not only on the taxonomic composition of TEP producers, but they are also influenced by other variables such as the organism's physiological state (Passow, 2002b), temperature (Nicolaus et al, 1999;Claquin et al, 2008), light (Trabelsi et al, 2008;Ortega-Retuerta et al, 2009a;Iuculano et al, 2017b), carbon dioxide concentration (Engel, 2002), nutrient availability (Guerrini et al, 1998;Radic et al, 2006), turbulence (Passow, 2000(Passow, , 2002b, microbe-microbe interactions (Gärdes et al, 2011) or viral infection (Shibata et al, 1997;Vardi et al, 2012). For example, limitation by nutrients often increases TEP production, due to dissolved inorganic carbon overconsumption (Corzo et al, 2000;Engel et al, 2002a;Schartau et al, 2007), and also impedes prokaryotic consumption of TEPs (Bar-Zeev and Rahav, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…For example, limitation by nutrients often increases TEP production, due to dissolved inorganic carbon overconsumption (Corzo et al, 2000;Engel et al, 2002a;Schartau et al, 2007), and also impedes prokaryotic consumption of TEPs (Bar-Zeev and Rahav, 2015). High solar radiation can stimulate TEP production by Prochlorococcus during cell decay (Iuculano et al, 2017b), but also can limit TEP formation inhibiting the aggregation of the precursor polymers (Orellana and Verdugo, 2003). HPs have been found to stimulate TEP production by diatoms, suggesting that HPdiatom interaction is required for TEP formation (Guerrini et al, 1998;Gärdes et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

Zamanillo¹,

Ortega−Retuerta

Nunes³

et al. 2019

Biogeosciences

View full text Add to dashboard Cite

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.

show abstract

Section: Teps Across the Surface Atlantic Oceancontrasting

confidence: 87%

Section: Teps Across the Surface Atlantic Oceanmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Zamanillo¹,

Ortega−Retuerta

Nunes³

et al. 2019

Biogeosciences

View full text Add to dashboard Cite

show abstract

Concentrations and sinking rates of transparent exopolymer particles (TEPs) in a coastal sea: the Changjiang River (Yangtze River) Estuary

Guo

Sun

2020

Acta Oceanol. Sin.

View full text Add to dashboard Cite

Transparent exopolymer particles (TEPs) are ubiquitous throughout the oceans, and their sedimentation is considered an efficient biological carbon sink pathway. However, the role TEPs play as a carbon sink in eutrophic coastal seas is not well studied. In order to investigate this issue, two cruises in the spring and summer of 2011 were carried out in the Changjiang (Yangtze River) estuary, a typical eutrophic coastal sea. The concentrations, sinking rates, and export flux of TEPs were studied. TEP concentrations ranged from 40.00 to 1040.00 μg Xeq L -1 (mean = 209.70 ± 240.93 μg Xeq L -1 ) in spring and from 56.67 to 1423.33 μg Xeq L -1 (mean = 433.33 ± 393.02 μg Xeq L -1 ) in summer. A significant positive correlation between TEP concentrations and chlorophyll (Chl) a concentrations was observed. TEP sinking rates ranged from 0.08 to 0.57 m d -1 (mean = 0.28 ± 0.14 m d -1 ) in spring and from 0.10 to 1.08 m d -1 (mean = 0.34 ± 0.31 m d -1 ) in summer. TEP sinking rates were always higher in the upper layers than in the deeper layers during both seasons. The export flux of TEPs was also calculated, and it ranged from 4.95 to 29.40 mg C m -2 d -1 in spring (mean = 14.66 ± 8.83 mg C m -2 d -1 ) and from 6.80 to 30.45 mg C m -2 d -1 (mean = 15.71 ± 8.73 mg C m -2 d -1 ) in summer. This study is the first study on TEP sinking in the Changjiang (Yangtze River) Estuary, and it confirmed that TEP plays a significant role as a carbon sink in the eutrophic coastal sea. IntroductionTransparent exopolymer particles (TEPs) are transparent gel-like particles in the ocean[1] that were first identified and named by Alldredge et al in 1993 [2]. They are formed from polysaccharides that are mainly exuded by phytoplankton cells and bacteria [3][4][5]. TEPs were .

show abstract

Transparent exopolymer particle (TEP) distribution and in situ prokaryotic generation across the deep Mediterranean Sea and nearby North East Atlantic Ocean

Ortega−Retuerta

Mazuecos

Reche

et al. 2019

Progress in Oceanography

View full text Add to dashboard Cite

Seagrass as major source of transparent exopolymer particles in the oligotrophic Mediterranean coast

Cited by 10 publications

References 33 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

Concentrations and sinking rates of transparent exopolymer particles (TEPs) in a coastal sea: the Changjiang River (Yangtze River) Estuary

Transparent exopolymer particle (TEP) distribution and in situ prokaryotic generation across the deep Mediterranean Sea and nearby North East Atlantic Ocean

Contact Info

Product

Resources

About