Dataset Information

Spatio-temporal variations of methane fluxes in sediments of a deep stratified temperate lake.

ABSTRACT: Spatio-temporal variability of sediment-mediated methane (CH₄) production in freshwater lakes causes large uncertainties in predicting global lake CH₄ emissions under different climate change and eutrophication scenarios. We conducted extensive sediment incubation experiments to investigate CH₄ fluxes in Lake Stechlin, a deep, stratified temperate lake. Our results show contrasting spatial patterns in CH₄ fluxes between littoral and profundal sites. The littoral sediments, ∼33% of the total sediment surface area, contributed ∼86.9% of the annual CH₄ flux at the sediment-water interface. Together with sediment organic carbon quality, seasonal stratification is responsible for the striking spatial difference in sediment CH₄ production between littoral and profundal zones owing to more sensitive CH₄ production than oxidation to warming. While profundal sediments produce a relatively small amount of CH₄, its production increases markedly as anoxia spreads in late summer. Our measurements indicate that future lake CH₄ emissions will increase due to climate warming and concomitant hypoxia/anoxia.

SUBMITTER: Kang M

PROVIDER: S-EPMC11000008 | biostudies-literature | 2024 Apr

REPOSITORIES: biostudies-literature

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Spatio-temporal variations of methane fluxes in sediments of a deep stratified temperate lake.

Kang Manchun M Liu Liu L Grossart Hans-Peter HP

iScience 20240316 4

Spatio-temporal variability of sediment-mediated methane (CH4) production in freshwater lakes causes large uncertainties in predicting global lake CH4 emissions under different climate change and eutrophication scenarios. We conducted extensive sediment incubation experiments to investigate CH4 fluxes in Lake Stechlin, a deep, stratified temperate lake. Our results show contrasting spatial patterns in CH4 fluxes between littoral and profundal sites. Th ...[more]

PMID: 38591008

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Project description:Cyanobacteria are important primary producers in temperate freshwater ecosystems. However, studies on the seasonal and spatial distribution of cyanobacteria in deep lakes based on high-throughput DNA sequencing are still rare. In this study, we combined monthly water sampling and monitoring in 2019, amplicon sequence variants analysis (ASVs; a proxy for different species) and quantitative PCR targeting overall cyanobacteria abundance to describe the seasonal and spatial dynamics of cyanobacteria in the deep hard-water oligo-mesotrophic Lake Tiefer See, NE Germany. We observed significant seasonal variation in the cyanobacterial community composition (p < 0.05) in the epi- and metalimnion layers, but not in the hypolimnion. In winter-when the water column is mixed-picocyanobacteria (Synechococcus and Cyanobium) were dominant. With the onset of stratification in late spring, we observed potential niche specialization and coexistence among the cyanobacteria taxa driven mainly by light and nutrient dynamics. Specifically, ASVs assigned to picocyanobacteria and the genus Planktothrix were the main contributors to the formation of deep chlorophyll maxima along a light gradient. While Synechococcus and different Cyanobium ASVs were abundant in the epilimnion up to the base of the euphotic zone from spring to fall, Planktothrix mainly occurred in the metalimnetic layer below the euphotic zone where also overall cyanobacteria abundance was highest in summer. Our data revealed two potentially psychrotolerant (cold-adapted) Cyanobium species that appear to cope well under conditions of lower hypolimnetic water temperature and light as well as increasing sediment-released phosphate in the deeper waters in summer. The potential cold-adapted Cyanobium species were also dominant throughout the water column in fall and winter. Furthermore, Snowella and Microcystis-related ASVs were abundant in the water column during the onset of fall turnover. Altogether, these findings suggest previously unascertained and considerable spatiotemporal changes in the community of cyanobacteria on the species level especially within the genus Cyanobium in deep hard-water temperate lakes.

Dataset Information

Spatio-temporal variations of methane fluxes in sediments of a deep stratified temperate lake.

Publications

Spatio-temporal variations of methane fluxes in sediments of a deep stratified temperate lake.

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