Climate-driven shifts in sediment chemistry enhance methane production in northern lakes

Emilson, Erik J. S.; Carson, M. A.; Yakimovich, Kurt M.; Osterholz, Helena; Dittmar, Thorsten; Gunn, John M.; Mykytczuk, Nadia; Basiliko, Nathan; Tanentzap, Andrew J.

doi:10.1038/s41467-018-04236-2

Cited by 50 publications

(36 citation statements)

References 51 publications

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“…The increase in CH 4 concentration and flux in the nursery ponds in August probably followed maturation and decomposition of fresh plant biomass rather than originating from old settled detritus (Kelly et al 1997). CH 4 production in lakes of temperate and boreal regions might differ substantially depending on the chemical composition of sediments (Emilson et al 2018). Sediments containing organic matter from macrophytes and aquatic plants produce more CH 4 than sediments containing organic matter of terrestrial origin.…”

Section: Discussionmentioning

confidence: 99%

“…Oxygen is an important factor in CH 4 production and consumption (Huttunen et al 2006, Juutinen et al 2009); lack of oxygen enhances CH 4 production in sediment, while its presence promotes its microbial oxidation (Bastviken et al 2002, Attermeyer et al 2016. The characteristics of catchment features, including vegetation and land use (Maberly et al 2013, Borges et al 2015a, temperature, rainfall, and wind speed influence CH 4 production, transport, and emission from aquatic ecosystems , Emilson et al 2018.…”

Section: Introductionmentioning

confidence: 99%

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Diffusive methane emissions from temperate semi-intensive carp ponds

Rutegwa¹,

Gebauer²,

Veselý³

et al. 2019

Aquacult. Environ. Interact.

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Manuring and supplementary feeding are common practices used to sustain high fish production in temperate semi-intensive carp ponds. How ever, the low use efficiency of added nutrients and organic matter may cause carp ponds to be 'hot spots' of methane (CH 4 ) production and emission. Surface CH 4 concentrations were measured and diffusive CH 4 flux was estimated using a wind-based transboundary layer model in 3 nursery and 3 main carp ponds with different feeding rates and organic loading during 1 growing season. Mean (± SD) concentrations of CH 4 were 1.3 ± 0.9 µM and 0.8 ± 0.8 µM in nursery and main ponds, respectively. All ponds were sources of CH 4 , with diffusive CH 4 fluxes of 9.1 ± 6.8 mg C m −2 d −1 in nursery ponds and 6.4 ± 6.9 mg C m −2 d −1 in main ponds. Lower CH 4 concentration and diffusive flux in the main ponds were probably due to bioturbation caused by the larger carp and consequent oxidation of the sediment. Seasonal dynamics of CH 4 were mainly related to temperature. Methane concentration and diffusive flux levels re corded in this study were within the range of those reported in natural water bodies worldwide. Our results provide information on the role of carp aquaculture in greenhouse gas emission in temperate regions.KEY WORDS: Methane · Greenhouse gas emission · Aquaculture pond · Freshwater · Seasonality · Temperature Emission of diffusive methane from a temperate fishpond and inputs inducing CH 4 production in carp ponds: (A) manuring and (B) feeding.Photo credit: Dr.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diffusive methane emissions from temperate semi-intensive carp ponds

Rutegwa¹,

Gebauer²,

Veselý³

et al. 2019

Aquacult. Environ. Interact.

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“…2. Changes in CO 2 and CH 4 emissions from boreal lakes contributed by C loadings from catchments: altered fluvial C exports can greatly affect lake CO 2 and CH 4 emissions (Weyhenmeyer et al 2015;Emilson et al 2018), an important C flux of similar magnitude to that of forest fires, harvested wood, and C storage in forest biomass and soil (Hastie et al 2018).…”

Section: Ecosystem Condition and Productivitymentioning

confidence: 99%

“…The major processes that regulate CO 2 and CH 4 emissions from lakes are mainly driven by the quantity and quality of terrigenous carbon inputs (e.g., Rasilo et al 2015;Weyhenmeyer et al 2015;Emilson et al 2018). The increase in terrestrial DOC export could enhance aquatic DOC and coloured dissolved organic matter concentrations and subsequently carbon emissions, as the additional terrestrial carbon could be readily degraded biologically and photochemically and converted to CO 2 and CH 4 in aquatic systems (Lapierre et al 2013;Rasilo et al 2015).…”

Section: Freshwater Ecosystemsmentioning

confidence: 99%

Atmospheric change as a driver of change in the Canadian boreal zone¹

et al. 2019

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Global anthropogenic emissions of greenhouse gases and hazardous air pollutants have produced broad yet regionally disparate changes in climatic conditions and pollutant deposition in the Canadian boreal zone (the boreal). Adapting boreal resource management to atmospheric change requires a holistic understanding and awareness of the ongoing and future responses of terrestrial and freshwater ecosystems in this vast, heterogeneous landscape. To integrate existing knowledge of and generate new insights from the broad-scale impacts of atmospheric change, we first describe historical and present trends (∼1980–2015) in temperature, precipitation, deposition of hazardous air pollutants, and atmospheric-mediated natural disturbance regimes in this region. We then examine their associations with ecosystem condition and productivity, biological diversity, soil and water, and the carbon budget. These associations vary considerably among ecozones and likely undergo further changes under the emerging risks of atmospheric change. We highlight the urgent need to establish long-term, boreal-wide monitoring for many key components of freshwater ecosystems to better understand and project the influences of atmospheric change on boreal water resources. We also formulate three divergent future scenarios of boreal ecosystems in 2050. Our scenario analysis reveals multiple undesirable changes in boreal ecosystem structure and functioning with more variable atmospheric conditions and frequent land disturbances, while continuing business-as-usual management of natural resources. It is possible, though challenging, to reduce unwanted consequences to ecosystems through management regimes focussed on socio-ecological sustainability and developing resilient infrastructure and adaptive resource-management strategies. We emphasize the need for proactive actions and improved foresight for all sectors of society to collaborate, innovate, and invest in anticipation of impending global atmospheric change, without which the boreal zone will face a dim future.

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“…Other studies have attributed the positive effect of graminoids to rapid decay rates (Treat et al, 2015), but that does not apply to the two species here that had relatively slow rates of leaf litter decay. Another hypothesis is that graminoids lack phenolic compounds in litter (Emilson et al, 2018) that are toxic to methanogens. However, leaves from shrubs and needleleaf trees are notoriously full of phenolics (Dorrepaal et al, 2005), yet decaying leaf litter from shrubs, and from needle-leaf trees here and in other studies (Yavitt and Williams, 2015;Corteselli et al, 2017) supported methanogenesis, which runs counter to the toxicity argument.…”

Section: Methanogenesis and Anaerobic Respirationmentioning

confidence: 99%

Inferring Methane Production by Decomposing Tree, Shrub, and Grass Leaf Litter in Bog and Rich Fen Peatlands

Yavitt

Kryczka

Huber

et al. 2019

Front. Environ. Sci.

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Plant litter provides a fresh source of energy and nutrients to fuel microbial activity in soil, and in northern peatlands this can be leaf litter from mosses, graminoids, shrubs, and/or trees. Because Sphagnum and other mosses decompose slowly, vascular plant litter assumes a principal role, but its role in microbial methane production is unclear. Therefore, we examined decomposition of leaf litter from nine species, including trees, shrubs, and graminoids, using litterbags positioned for up to 2.5 years in two raised bogs and in two rich fens. Across species leaf litter quality varied for concentrations of nitrogen, soluble organic matter, and cell wall composition. After 2.5 years of decay the amount of leaf litter mass remaining ranged from 43 to 63% in the bogs vs. 17 to 71% in the rich fens. Thus, site conditions interacted with litter quality to determine decay rates but with species-specific patterns. Leaf mass remaining after 0.5, 1.5, and 2.5 years of decay was incubated in vitro, without soil, to assess its ability to support methane production and concomitant anaerobic carbon dioxide respiration. Residue from all nine species supported methane production, with the greatest rates (up to 5,000 nmol g −1 day −1 ) in tissue with high concentrations of pectin. Rates were 2-to 700-times greater for the leaf material that decomposed in the rich fens than in the bogs. Production rates were more variable for methane than for anaerobic respiration. As seen for mass loss, differences in litter quality predicted variation in gas production rates but differently in the bogs than in the rich fens. The results underscore the importance of vascular plant litter in the biogeochemistry of carbon and methane in peatlands and why vegetation, plant species composition, and peatland type must be described to put peatland ecosystems into global budgets of carbon and methane.

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Climate-driven shifts in sediment chemistry enhance methane production in northern lakes

Cited by 50 publications

References 51 publications

Diffusive methane emissions from temperate semi-intensive carp ponds

Diffusive methane emissions from temperate semi-intensive carp ponds

Atmospheric change as a driver of change in the Canadian boreal zone¹

Inferring Methane Production by Decomposing Tree, Shrub, and Grass Leaf Litter in Bog and Rich Fen Peatlands

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Climate-driven shifts in sediment chemistry enhance methane production in northern lakes

Cited by 50 publications

References 51 publications

Diffusive methane emissions from temperate semi-intensive carp ponds

Diffusive methane emissions from temperate semi-intensive carp ponds

Atmospheric change as a driver of change in the Canadian boreal zone1

Inferring Methane Production by Decomposing Tree, Shrub, and Grass Leaf Litter in Bog and Rich Fen Peatlands

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Atmospheric change as a driver of change in the Canadian boreal zone¹