Methane concentration in water column and in pore water of a coastal lagoon (Cabiúnas lagoon, Macaé, RJ, Brazil)

Fonseca, André Luiz dos Santos; Minello, Murilo; Marinho, Cláudio Cardoso; Esteves, Francisco de Assis

doi:10.1590/s1516-89132004000200018

Cited by 31 publications

(22 citation statements)

References 15 publications

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“…In addition, methane production also can be linked to labile carbon via root exudates [36] [37], which can increase the consumption of oxygen and production of substrates for methanogenesis. These results corroborate those of other studies that also revealed high methane concentrations in sediment colonized by emergent macrophytes [34] [38]- [40]. However, the presence of emergent macrophytes can also inhibit methanogenesis via the oxidation of sediment.…”

Section: Resultssupporting

confidence: 92%

Emergent Macrophytes Alter the Sediment Composition in a Small, Shallow Subtropical Lake: Implications for Methane Emission

Marinho¹,

Palma‐Silva²,

Albertoni³

et al. 2015

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Aquatic macrophytes in shallow lakes emit high levels of methane. We hypothesize that the presence of emergent aquatic macrophytes in an artificial shallow lake promotes important input of autochthonous organic matter (OM) in sediment and higher levels of methane emission via bubbles. Samplings were performed at three sites in a small, shallow subtropical lake: (1) one station in the limnetic region and (2) -(3) two stations in the littoral region ((2) inside and (3) outside aquatic macrophyte stands). A higher concentration of OM was observed at the macrophyte station, and within this site, a higher methane concentration was observed in the sediment. These results could explain the methane ebullition values at macrophyte sites. At the macrophyte station, methane emission via bubbles contributed 17% to 56% of the total methane emission; however, at the other stations, its contribution via bubbles, was lower than 1%. This research confirmed the importance of emergent macrophytes at Polegar Lake as a source of OM in sediment and methane emission via bubbles. Further, we could confirm the positive effects of temperature on methane emission, mainly by bubbles.

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Section: Resultssupporting

confidence: 92%

Emergent Macrophytes Alter the Sediment Composition in a Small, Shallow Subtropical Lake: Implications for Methane Emission

Marinho¹,

Palma‐Silva²,

Albertoni³

et al. 2015

AJPS

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“…Beyond CO 2 fluxes, the importance of aquatic macrophytes to C balance in coastal lagoons is also related to the dynamic of some other compounds, such as methane (Fonseca et al, 2004, Petruzzella et al, 2013. Aquatic plant roots influence the activity of microorganisms through organic matter production and oxygen transportation to the rhizosphere (Garnet et al 2005).…”

Section: Discussionmentioning

confidence: 99%

The role played by aquatic macrophytes regarding CO2 balance in a tropical coastal lagoon (Cabiúnas Lagoon, Macaé, RJ)

Gripp¹,

Marinho²,

Sanches³

et al. 2013

Acta Limnol. Bras.

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The role played by aquatic macrophytes regarding CO 2 balance in a tropical coastal lagoon (Cabiúnas Lagoon, Macaé, RJ)O papel desempenhado pelas macrófitas aquáticas em relação ao balanço de CO 2 em uma lagoa costeira tropical (Lagoa Cabiúnas, Macaé, RJ) 2 ) is an important atmospheric trace gas that is involved in both the biological carbon cycle and global warming. Inland waters -mainly lakes -contribute to C cycling and have been considered a large source of atmospheric CO 2 . However, scientific studies usually neglect lake morphometry and the presence of aquatic macrophytes in littoral zones, which have a great potential for CO 2 absorption and for C storage. This study aimed to evaluate the importance of the littoral region on the CO 2 balance in the Cabiúnas Lagoon, while also considering the contribution of the limnetic region and of Typha domingensis and Eichhornia azurea, prominent species in the area. Methods: CO 2 flux was estimated by a linear integration of CO 2 concentrations measured in the internal atmospheric of a single-component static closed chambers at the studied sites. The distribution of macrophyte stands throughout lagoon surface was taken into account to evaluate the effects of macrophytes on CO 2 supersaturation. Other factors were also measured throughout the sampling process to evaluate their relationship with CO 2 flux data by means of Akaike model selection criterion. The area covered by aquatic macrophytes at the Cabiúnas lagoon was estimated by profiles and transects. Results and discussion: CO 2 flux through the water surface ranged from -7.39 to 17.56 mgCO2m -2 h -1 . An emission pattern predominated, suggesting that water columns are CO 2 supersaturated at all sampling sites. Rates were similar among all the sampling sites, suggesting that aquatic macrophytes do not influence CO 2 saturation in the water column at Cabiúnas lagoon. On the other hand, CO 2 fluxes from macrophyte tissues showed a clear assimilation pattern. Influxes were higher in T. domingensis (-229.1 ± 320.9 mg CO2.m -2 .h -1 ) than in E. azurea stands (-43.8 ± 39.5 mg CO2.m -2 .h -1 ). Once these macrophytes covered a considerable area of the lagoon and CO 2 absorption strongly overwhelmed the emission processes, then we were able to extrapolate data from the total estimated area of the evaluated sites (75% of the Cabiúnas lagoon), which resulted in a net influx of 46.6 mg CO2.m -2 .h -1 . The strong Typha domingensis contribution to CO 2 absorption and other C cycling processes indicate that it is one of the most important species to Carbon cycling in the studied ecosystem. Thus, it is worth considering C cycling in lake littoral zones as a key process when estimating C balance in shallow aquatic ecosystems.

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“…In many freshwater sediment systems, methanogenesis is the dominant terminal mineralization process under anaerobic conditions (Furtado et al 2002). In a tropical coastal lagoon, the sediment presented changes that were attributed both to the detritus of aquatic macrophytes and to the surrounding restinga vegetation, which could facilitate methanogenesis (Fonseca et al 2004). In the present study, the modification of the area surrounding the lakes was the main source of organic matter for the dystrophic and eutrophic lakes.…”

Section: Discussionmentioning

confidence: 99%

“…The inputs of organic carbon stimulate methanogenesis in surface sediment, but also in the deeper sediment layer by diffusion of dissolved labile organic matter (Schulz and Conrad 1995).The allochthonous input of organic matter is one of the facilitators of methanogenesis and of the dynamics of CH 4 (Bastviken et al 2004;Fonseca et al 2004). …”

Section: Introductionmentioning

confidence: 99%

Methane levels in shallow subtropical lake sediments: Dependence on the trophic status of the lake and allochthonous input

et al. 2012

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a b s t r a c tThe vertical sediment profiles (10 cm) of the margins of three shallow subtropical lakes (Rio Grande, Brazil) with different trophic states and surrounding areas were evaluated to identify the effects of the allochthonous input on the methane concentration in the sediment. Sediment cores were collected to quantify the organic matter content (OM) and total carbon (TC), total nitrogen (TN), total phosphorous (TP) and methane (CH 4 ) concentrations.The three lakes were distinguished according to the trophic status and classified as oligotrophic, dystrophic and eutrophic. The natural characteristics of the dystrophic and eutrophic lakes have been changed due to the allochthonous input of leaves and twigs (Eucalyptus sp.) and the excreta of birds, respectively. In the eutrophic lake, the allochthonous input contributed to high autochthonous production. The highest values of OM, TC, TN and TP were found in the superficial sediments of the dystrophic and eutrophic lakes. The accumulation of allochthonous organic matter in the littoral zone promoted changes in the vertical sediment profiles and contributed to increases in the CH 4 concentrations in the sediment.

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Methane concentration in water column and in pore water of a coastal lagoon (Cabiúnas lagoon, Macaé, RJ, Brazil)

Cited by 31 publications

References 15 publications

Emergent Macrophytes Alter the Sediment Composition in a Small, Shallow Subtropical Lake: Implications for Methane Emission

Emergent Macrophytes Alter the Sediment Composition in a Small, Shallow Subtropical Lake: Implications for Methane Emission

The role played by aquatic macrophytes regarding CO2 balance in a tropical coastal lagoon (Cabiúnas Lagoon, Macaé, RJ)

Methane levels in shallow subtropical lake sediments: Dependence on the trophic status of the lake and allochthonous input

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