Decomposition and nutrient dynamics in a Spartina alterniflora marsh of the Bahia Blanca estuary, Argentina

Negrin, Vanesa Lorena; Trilla, Gabriela González; Kandus, Patricia; Marcovecchio, Jorge Eduardo

doi:10.1590/s1679-87592012000200016

Cited by 6 publications

(6 citation statements)

References 27 publications

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“…It is notable that although the total biomass in our mesh bags was reduced by about 70% over a 16-week period, our results conform to a first order decay model alluded to in previous experiments [ 28 , 67 – 69 ]. These previous studies suggest the majority of particulate decomposition occurs within the first year of entry into the system and proceeds through three phases: the leaching of soluble compounds, decomposition and a final refractory phase characterised by diminished rates of decomposition [ 28 , 67 – 69 ]. Valiela et al [ 67 ] suggest the refractory period is confined to decomposition rates below 0.4% day −1 .…”

Section: Discussionsupporting

confidence: 90%

“…Studies have established degradation rates of deposited lignocellulose in situ at surface levels using litterbag methodologies [ 9 , 20 , 28 – 31 ]; however, very little is known about the microbial framework that regulates this decomposition or the enzymatic mechanisms employed to deconstruct the complex lignocellulosic substrate. In vitro studies have suggested that bacteria, such as Cyclobacteriaceae , Desulfobacteraceae , Flavobacteriaceae , Halomonadaceae , Oceanospirillales , Pseudomonadaceae and Spirochaetaceae , are involved in lignocellulose degradation in this environment with fungi becoming competitively displaced [ 32 – 34 ].…”

Section: Introductionmentioning

confidence: 99%

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Mechanistic strategies of microbial communities regulating lignocellulose deconstruction in a UK salt marsh

et al. 2021

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Background Salt marshes are major natural repositories of sequestered organic carbon with high burial rates of organic matter, produced by highly productive native flora. Accumulated carbon predominantly exists as lignocellulose which is metabolised by communities of functionally diverse microbes. However, the organisms that orchestrate this process and the enzymatic mechanisms employed that regulate the accumulation, composition and permanence of this carbon stock are not yet known. We applied meta-exo-proteome proteomics and 16S rRNA gene profiling to study lignocellulose decomposition in situ within the surface level sediments of a natural established UK salt marsh. Results Our studies revealed a community dominated by Gammaproteobacteria, Bacteroidetes and Deltaproteobacteria that drive lignocellulose degradation in the salt marsh. We identify 42 families of lignocellulolytic bacteria of which the most active secretors of carbohydrate-active enzymes were observed to be Prolixibacteracea, Flavobacteriaceae, Cellvibrionaceae, Saccharospirillaceae, Alteromonadaceae, Vibrionaceae and Cytophagaceae. These families secreted lignocellulose-active glycoside hydrolase (GH) family enzymes GH3, GH5, GH6, GH9, GH10, GH11, GH13 and GH43 that were associated with degrading Spartina biomass. While fungi were present, we did not detect a lignocellulolytic contribution from fungi which are major contributors to terrestrial lignocellulose deconstruction. Oxidative enzymes such as laccases, peroxidases and lytic polysaccharide monooxygenases that are important for lignocellulose degradation in the terrestrial environment were present but not abundant, while a notable abundance of putative esterases (such as carbohydrate esterase family 1) associated with decoupling lignin from polysaccharides in lignocellulose was observed. Conclusions Here, we identify a diverse cohort of previously undefined bacteria that drive lignocellulose degradation in the surface sediments of the salt marsh environment and describe the enzymatic mechanisms they employ to facilitate this process. Our results increase the understanding of the microbial and molecular mechanisms that underpin carbon sequestration from lignocellulose within salt marsh surface sediments in situ and provide insights into the potential enzymatic mechanisms regulating the enrichment of polyphenolics in salt marsh sediments.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Mechanistic strategies of microbial communities regulating lignocellulose deconstruction in a UK salt marsh

et al. 2021

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“…The concentration of C, N and P and the C/N and C/P ratios in both tissues varied during decomposition, as has been observed in other studies (e.g., Menendez and Sanmartí, 2007;Negrin et al, 2012b;Simões et al, 2011;Tong et al, 2011). This could be related to the alternate activity of different groups of decomposers at different moments and the consequent effect on the rate of mineralization of nutrients (Anesio et al, 2003).…”

Section: Discussionsupporting

confidence: 69%

“…(e.g., Conteaûx et al, 1995;Menendez and Sanmartí, 2007). Decomposition rates for S. alterniflora (Negrin et al, 2012b) were lower than the reported here, meaning that, within this estuary, this process has different significance according to the dominant species.…”

Section: Discussioncontrasting

confidence: 65%

Biomass, decomposition and nutrient cycling in a SW Atlantic Sarcocornia perennis marsh

Negrin

Pratolongo

Villalobos

et al. 2015

Journal of Sea Research

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“…As of June, however, there had not been a king tide event or storm event large enough to move the wrack away. Instead of moving laterally, it moved vertically to beneath the canopy where it now has the opportunity to reinforce the marsh system as a whole through the food cycle [41].…”

Section: Discussionmentioning

confidence: 99%

The Dynamic Nature of Wrack: An Investigation into Wrack Movement and Impacts on Coastal Marshes Using sUAS

Morgan,

Wang

et al. 2023

Drones

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This study investigates the use of small unoccupied aerial systems (sUAS) as a new remote sensing tool to identify and track the spatial distribution of wrack on coastal tidal marsh systems. We used sUAS to map the wrack movement in a Spartina alterniflora-dominated salt marsh monthly for one year including before and after Hurricane Isaias that brought strong winds, rain, and storm surge to the area of interest in August 2020. Flight parameters for each data collection mission were held constant including collection only during low tide. Wrack was visually identified and digitized in a GIS using every mission orthomosaic created from the mission images. The digitized polygons were visualized using a raster data model and a combination of all of the digitized wrack polygons. Results indicate that wrack mats deposited before and as a result of a hurricane event remained for approximately three months. Furthermore, 55% of all wrack detritus was closer than 10 m to river or stream water bodies, 64% were within 15 m, and 71% were within 20 m, indicating the spatial dependence of wrack location in a marsh system on water and water movement. However, following the passing of Isaias, the percentage of wrack closer than 10 m to a river or creek decreased to a low of 44%, which was not seen again during the year-long study. This study highlights the on-demand image collection of a sUAS for providing new insights into how quickly wrack distribution and vegetation can change over a short time.

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Decomposition and nutrient dynamics in a Spartina alterniflora marsh of the Bahia Blanca estuary, Argentina

Cited by 6 publications

References 27 publications

Mechanistic strategies of microbial communities regulating lignocellulose deconstruction in a UK salt marsh

Mechanistic strategies of microbial communities regulating lignocellulose deconstruction in a UK salt marsh

Biomass, decomposition and nutrient cycling in a SW Atlantic Sarcocornia perennis marsh

The Dynamic Nature of Wrack: An Investigation into Wrack Movement and Impacts on Coastal Marshes Using sUAS

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