Snails promote methane release from a freshwater lake ecosystem

Xu, Xiao; Zhao, Wei; Xiao, Ming; Huang, Jingxin; Fang, Changming; Li, Bo; Nie, Ming

doi:10.3389/fenvs.2014.00012

Cited by 6 publications

(4 citation statements)

References 26 publications

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“…The mean annual temperature and precipitation are 17°C and 1636 mm, respectively. The Poyang Lake wetland has a high fluctuation of seasonal water levels between the flood and dry seasons (Xu et al, 2014 ). In the dry season, the surface area of the lake shrinks to less than one-tenth of the area in the flood season.…”

Section: Methodsmentioning

confidence: 99%

Spatial distribution of bacterial communities driven by multiple environmental factors in a beach wetland of the largest freshwater lake in China

et al. 2015

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The spatial distributions of bacterial communities may be driven by multiple environmental factors. Thus, understanding the relationships between bacterial distribution and environmental factors is critical for understanding wetland stability and the functioning of freshwater lakes. However, little research on the bacterial communities in deep sediment layers exists. In this study, thirty clone libraries of 16S rRNA were constructed from a beach wetland of the Poyang Lake along both horizontal (distance to the water-land junction) and vertical (sediment depth) gradients to assess the effects of sediment properties on bacterial community structure and diversity. Our results showed that bacterial diversity increased along the horizontal gradient and decreased along the vertical gradient. The heterogeneous sediment properties along gradients substantially affected the dominant bacterial groups at the phylum and species levels. For example, the NH+4 concentration decreased with increasing depth, which was positively correlated with the relative abundance of Alphaproteobacteria. The changes in bacterial diversity and dominant bacterial groups showed that the top layer had a different bacterial community structure than the deeper layers. Principal component analysis revealed that both gradients, not each gradient independently, contributed to the shift in the bacterial community structure. A multiple linear regression model explained the changes in bacterial diversity and richness along the depth and distance gradients. Overall, our results suggest that spatial gradients associated with sediment properties shaped the bacterial communities in the Poyang Lake beach wetland.

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Section: Methodsmentioning

confidence: 99%

Spatial distribution of bacterial communities driven by multiple environmental factors in a beach wetland of the largest freshwater lake in China

et al. 2015

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“…In freshwater ecosystem, the snails (Mollusca: Gastropoda) carry out multiple functional roles, − many of which are attributable to the shell. Apart from mechanical strength and protection, the shells of freshwater snails facilitate the anchorage of various microbes and periphytons .…”

Section: Introductionmentioning

confidence: 99%

Microstructure Analysis and Chemical and Mechanical Characterization of the Shells of Three Freshwater Snails

et al. 2020

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The shells of freshwater snails are discarded as waste, which qualify as biological materials with prospective multiple uses. To substantiate this proposition, an attempt was made to elucidate the physical and chemical properties of the shells of three freshwater snails, namely, Bellamya bengalensis , Pila globosa , and Brotia costula . The shells were prepared for electron microscopy and assessment of the calcium carbonate content, apart from the Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), and nanoindentation studies. The results indicated that the calcium carbonate content ( y ) of the shells ranged between 87 and 96% of the total weight ( x ) and complied with a power regression equation: y = 0.801 x 1.016 ; R 2 = 0.994; r = +0.998; P < 0.001. Observations through SEM depicted different snail species-specific arrangement patterns of calcium carbonate crystals in the diverse layers of shells. The XRD, FTIR, and EDS observations revealed the dominance of the aragonite form of the calcium carbonate crystal in the microstructures of each snail shell with the occurrence of different shell surface functional groups. The Brunauer–Emmett–Teller analysis elucidated the surface textures of shell dust taken from each snail species; in addition, the nanohardness properties indicate the shells as a tough biocomposite exoskeleton. Species-specific variations in the shell morphology, microstructure, and calcium carbonate content were prominent for the three freshwater snails considered for the study. Nonetheless, the physical and chemical properties substantiate that the shells of B. bengalensis , P. globosa , and B. costula qualify as biological materials for sustainable use in various fields including bioremediation, biocatalyst, biomedical applications, and a source of lime. Since the shells of the freshwater snails are discarded as aquaculture waste, subsequent use as a biological material will support the “waste made useful” paradigm in sustainability, both from ecological and economic perspectives.

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“…Macrophyte stands also provide a habitat for several aquatic organism groups that produce CH 4 via classic methanogenesis in an otherwise aerobic water column. Marine zooplankton produces CH 4 in anoxic microzones (De Angelis and Lee 1994; Schmale et al 2018) and snails have been shown to promote CH 4 release from freshwater lakes (Xu et al 2014). Provision of shelter for zooplankton and macroinvertebrates has been observed for marine kelps (Pakhomov et al 2002), seagrass stands (Robertson et al 1988), and freshwater submerged macrophytes (Timms and Moss 1984).…”

Section: Potential Of Submerged Macrophytes For Ompmentioning

confidence: 99%

Potential role of submerged macrophytes for oxic methane production in aquatic ecosystems

Hilt

Grossart

Mcginnis

et al. 2022

Limnology & Oceanography

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Methane (CH4) from aquatic ecosystems contributes to about half of total global CH4 emissions to the atmosphere. Until recently, aquatic biogenic CH4 production was exclusively attributed to methanogenic archaea living under anoxic or suboxic conditions in sediments, bottom waters, and wetlands. However, evidence for oxic CH4 production (OMP) in freshwater, brackish, and marine habitats is increasing. Possible sources were found to be driven by various planktonic organisms supporting different OMP mechanisms. Surprisingly, submerged macrophytes have been fully ignored in studies on OMP, yet they are key components of littoral zones of ponds, lakes, and coastal systems. High CH4 concentrations in these zones have been attributed to organic substrate production promoting classic methanogenesis in the absence of oxygen. Here, we review existing studies and argue that, similar to terrestrial plants and phytoplankton, macroalgae and submerged macrophytes may directly or indirectly contribute to CH4 formation in oxic waters. We propose several potential direct and indirect mechanisms: (1) direct production of CH4; (2) production of CH4 precursors and facilitation of their bacterial breakdown or chemical conversion; (3) facilitation of classic methanogenesis; and (4) facilitation of CH4 ebullition. As submerged macrophytes occur in many freshwater and marine habitats, they are important in global carbon budgets and can strongly vary in their abundance due to seasonal and boom‐bust dynamics. Knowledge on their contribution to OMP is therefore essential to gain a better understanding of spatial and temporal dynamics of CH4 emissions and thus to substantially reduce current uncertainties when estimating global CH4 emissions from aquatic ecosystems.

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Snails promote methane release from a freshwater lake ecosystem

Cited by 6 publications

References 26 publications

Spatial distribution of bacterial communities driven by multiple environmental factors in a beach wetland of the largest freshwater lake in China

Spatial distribution of bacterial communities driven by multiple environmental factors in a beach wetland of the largest freshwater lake in China

Microstructure Analysis and Chemical and Mechanical Characterization of the Shells of Three Freshwater Snails

Potential role of submerged macrophytes for oxic methane production in aquatic ecosystems

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