Seasonal dynamics of methane in the water column of two subtropical lakes differing in trophic status

Marinho, Cláudio Cardoso; Silva, C Palma; Albertoni, Edélti Faria; Trindade, Cláudio Rossano Trindade; Esteves, Francisco A.

doi:10.1590/s1519-69842009000200007

Cited by 25 publications

(20 citation statements)

References 25 publications

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“…This result suggests that temperature has effects on methanogenesis ( Table 2), which agrees with the literature [6] [8]. The same pattern was observed in samplings performed at the Polegar Lake in 2001 and 2002 [10], in which methane concentrations in the water column were also higher in spring compared to winter. Furthermore, we can observe a trophic state change in Polegar Lake, from oligotrophic to mesotrophic.…”

Section: Resultssupporting

confidence: 90%

“…This lake has an area of approximately 1 ha, with an average depth of 1.5 m, and the depth varies depending on rainfall amounts. It is characterized as an oligo-mesotrophic lake with low primary production and low nutrient concentration [10] [23]. Its shallow depth and wind action characterize it as polymictic.…”

Section: Study Areamentioning

confidence: 99%

“…Several environments indicate that methanogenesis in sediments is highly sensitive to temperature [7]- [9]. Studies on methane dynamics in shallow lakes in southern Brazil have shown that a variation of almost 10˚C between sampling periods was positively related to the concentration of methane, indicating the importance of seasonality, mainly in an oligo-mesotrophic environment [10].…”

Section: Introductionmentioning

confidence: 99%

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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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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: 90%

Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…The richness index increased from 15 (24 hours) to 34 at day 71 and exhibited significant differences over time (F = 10.84) ( Table 1). The density also significantly increased during the decomposition period (F = 33.36), from 2315.03 ind.100 g.DW -1 (± 861.38) on the first day to 58881.58 ind.100 g.DW -1 (± 2761.01) on and nutrient concentrations (Albertoni et al, 2007;Furlanetto et al, 2008;Trindade et al, 2008;Marinho et al, 2009). The sediment is sandy and contains low concentrations of nutrients and organic matter (Leonardo Marques Furlanetto, personal communication).…”

Section: Resultsmentioning

confidence: 94%

Leaf degradation of Salix humboldtiana Willd. (Salicaceae) and invertebrate colonization in a subtropical lake (Brazil)

Telöken¹,

Albertoni²,

Palma‐Silva³

2011

Acta

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Aim: To evaluate leaf degradation and invertebrate colonization of Salix humboldtiana Willd. in a subtropical shallow lake on the coastal plain of Rio Grande do Sul, Brazil; Methods: Litter bags containing 6.85 g of leaves were incubated in the superficial layer of sediment in the littoral region for 1, 4, 7, 14, 32, 47 and 71 days; Results: After 71 days, a loss of 51% of the initial leaf weight was observed (k = 0.0100 d -1). We estimated that it would take 300 days to lose 95% of the initial weight. A total of 16040 organisms and 35 taxa were identified. Caenidae (25.9%), Oligochaeta (19%), Ostracoda (13.8%), Hydracarina (9.8%), Tanypodinae (9.7%) and Coenagrionidae (7.7%) were the most highly represented taxa. We observed increases in density, richness and diversity of taxa over time, with a stabilizing trend noted in the taxa diversity. Regarding the functional trophic groups (FTGs), gathering-collectors accounted for 57.6% of the community, while predators (25%), scrapers (15.8%), filtering-collectors (0.88%) and shredders (0.73%) were also represented. The diversity and evenness of the FTGs had stabilized by day 14; Conclusions: S. humboldtiana detritus provides a favorable habitat for a sufficient duration to support a high density and diversity of aquatic invertebrates. The small percentage of shredders indicates the minor influence of the invertebrate community on the rate of detrital degradation. The main contribution of invertebrates to detrital processing comes from the consumption of fine particulate organic matter by gathering-collectors.Keywords: leaf decay coefficients, decomposition, functional trophic groups, sandy coastal plain.Resumo: Objetivos: Avaliar a degradação foliar de Salix humboldtiana Willd. e a colonização pela comunidade de invertebrados aquáticos em um lago raso subtropical, planície costeira do Rio Grande do Sul, Brasil; Métodos: Bolsas de decomposição contendo 6,85 g de folhas foram incubadas na região litorânea, na superfície do sedimento, e retiradas após 1, 4, 7, 14, 32, 47 e 71 dias de decomposição; Resultados: Aos 71 dias foi registrada a degradação de 51% do peso inicial (k = 0,0100 d -1 ). O tempo estimado para a degradação de 95% do peso inicial dos detritos foi 300 dias. Foram identificados 16.040 organismos, distribuídos em 35 táxons. Caenidae (25,9%), Oligochaeta (19%), Ostracoda (13,8%), Hydracarina (9,8%), Tanypodinae (9,7%) e Coenagrionidae (7,7%) foram os táxons mais representativos. Foi observado incremento na riqueza, densidade e diversidade dos táxons ao longo do tempo, com tendência à estabilização dos valores de diversidade. Em relação aos grupos tróficos funcionais (GTFs), coletores-catadores representaram 57,6% da comunidade, enquanto predadores (25%), raspadores (15,8%), coletores-filtradores (0,88%) e fragmentadores (0,73%) também foram representados. A diversidade e homogeneidade dos GTFs apresentaram estabilização a partir do 14º dia; Conclusões: Os detritos de S. humboldtiana fornecem um habitat favorável por tempo suficiente para suportar ...

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“…The Rio Grande do Sul coastal plain in southern Brazil is characterized by wide coverage by aquatic ecosystems; 39% of the 37,000 km 2 are covered by lagoons, freshwater shallow lakes and wetlands (Schwarzbold and Schäfer 1984). The CH 4 concentration in the water column in lakes of the southern part of the Brazilian coastal plain was determined to be in the intermediate range relative to temperate lakes (Marinho et al 2009). Despite this previous study by Marinho et al,the CH 4 dynamics in this region are still poorly understood.…”

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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Seasonal dynamics of methane in the water column of two subtropical lakes differing in trophic status

Cited by 25 publications

References 25 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

Leaf degradation of Salix humboldtiana Willd. (Salicaceae) and invertebrate colonization in a subtropical lake (Brazil)

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

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