Phosphorus Regulation of Methane Oxidation in Water From Ice‐Covered Lakes

Sawakuchi, Henrique O.; Martin, Gaëtan; Peura, Sari; Bertilsson, Stefan; Karlsson, Jan; Bastviken, David

doi:10.1029/2020jg006190

Cited by 9 publications

(13 citation statements)

References 64 publications

(135 reference statements)

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“…(2021) observed the migration of reduced sulfur species from several centimeters below the sediment‐water interface when no ice was present in shallow Prairie Pothole lakes to at or above the sediment‐water interface under the ice. Another study found a relationship between methane oxidation and P content among different lakes (Sawakuchi et al., 2021), which could also be a redox‐related relationship given that phosphate is released from sediments at higher rates under lowered redox states (Mortimer, 1942).…”

Section: Physical and Biogeochemical Dynamicsmentioning

confidence: 98%

Whither Winter: The Altered Role of Winter for Freshwaters as the Climate Changes

et al. 2022

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Our changing climate is having effects on freshwater ecosystems in all seasons, especially winter. High latitude lakes, wetlands, and rivers are experiencing shorter periods of ice cover, and lower latitudes systems that used to freeze are experiencing open water conditions throughout the winter. A 2019 AGU Chapman conference convened aquatic scientists to examine these changes and address the implications of changing winters to aquatic life, chemistry, and physics. Several studies demonstrate decreased ice cover duration than in the past. The removal of an ice “lid” from lakes and rivers impacts the exchange of gases with the atmosphere and the predominant types of metabolism occurring in the waters below, with the potential for more photosynthesis and an increase in oxic versus anoxic metabolism when the lid is removed. Multiple studies indicated an increase in the interannual variability of winters, especially in terms of ice‐cover duration and ice quality. Increased variability may simply be an outcome of a more variable winter climate or small differences in environmental conditions such as temperature that can have strong effects on gas exchange, light transmission, and turbulence when ice forms. A question that merits further consideration is whether and how winters of shorter duration and severity will change the dynamics of freshwater systems. Are there memory or legacy effects that carry over to the next season or year? There is much work to be done to understand how changing winters will impact the biogeochemical behavior of lakes and rivers in the coming decades.

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Section: Physical and Biogeochemical Dynamicsmentioning

confidence: 98%

Whither Winter: The Altered Role of Winter for Freshwaters as the Climate Changes

et al. 2022

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“…Our sampling depths represented the surface mixed layer (surface), metalimnion (intermediate), and the deepest oxic waters in the hypolimnion or above the sediment (deep). This approach allowed us to cover a range of environmental conditions in terms of O 2 and CH 4 concentrations, as well as in terms of general water column chemistry (pH, TP, TN, and DOC) which are important drivers of the MOB community and CH 4 oxidation (Sawakuchi et al, 2016;Crevecoeur et al, 2019;Thottathil et al, 2019;Guggenheim et al, 2020;Reis et al, 2020;Sawakuchi et al, 2021;Kashi et al, 2022;Nijman et al, 2022).…”

Section: Study Area and Sampling Strategymentioning

confidence: 99%

“…Unlike these systems, only a few experimentally determined α ox values exist for aquatic systems: 1.009 in a subtropical reservoir (Itoh et al, 2015), 1.013-1.021 in experimentally flooded boreal reservoir (Venkiteswaran and Schiff, 2005), and 1.018 to 1.021 in three Frontiers in Environmental Science frontiersin.org boreal lakes (Bastviken et al, 2002). However, given that MOX rates vary several orders of magnitude across lakes (Bastviken et al, 2002;Thottathil et al, 2019;Denfeld et al, 2016;Sawakuchi et al, 2021;D'Ambrosio and Harrison, 2021) and considering that MOX rate is often coupled with isotopic fractionation (Chanton et al, 2008;Gebert and Streese-Kleeberg, 2017), existing estimates (1.009-1.021) likely underrepresent the extent of α ox variability in lakes. Unlike previous studies, we estimated the isotopic fractionation factor across and within several lakes covering large environmental gradients and range in methanotrophic activity.…”

Section: Variability and Patterns Of α Ox In Freshwater Lakesmentioning

confidence: 99%

“…Since the number of αox estimates are limited in lakes, knowledge of the natural variability and environmental control of α ox in these ecosystems is critically lacking. Methanotrophy in lakes is controlled by a suite of environmental factors including temperature, pH, total phosphorus (TP), total nitrogen (TN), and dissolved organic carbon (DOC) through regulating MOB population, supply of substrates (CH 4 and O 2 ), and by affecting water column light attenuation (Crevecoeur et al, 2019;Thottathil et al, 2019;Guggenheim et al, 2020;Reis et al, 2020;Sawakuchi et al, 2021;Kashi et al, 2022;Nijman et al, 2022). As response to these multiple environmental factors, MOX rates in freshwater lakes vary widely (Bastviken et al, 2002;Bastviken et al, 2008;Thottathil et al, 2019;Denfeld et al, 2016;Sawakuchi et al, 2021;D'Ambrosio and Harrison, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Methanotrophy in lakes is controlled by a suite of environmental factors including temperature, pH, total phosphorus (TP), total nitrogen (TN), and dissolved organic carbon (DOC) through regulating MOB population, supply of substrates (CH 4 and O 2 ), and by affecting water column light attenuation (Crevecoeur et al, 2019;Thottathil et al, 2019;Guggenheim et al, 2020;Reis et al, 2020;Sawakuchi et al, 2021;Kashi et al, 2022;Nijman et al, 2022). As response to these multiple environmental factors, MOX rates in freshwater lakes vary widely (Bastviken et al, 2002;Bastviken et al, 2008;Thottathil et al, 2019;Denfeld et al, 2016;Sawakuchi et al, 2021;D'Ambrosio and Harrison, 2021). However, whether α ox values equally vary along with the MOX rates and/or how multiple environmental factors simultaneously shape the isotopic fractionation during CH 4 oxidation in highly dynamic environments such as freshwater lakes remain elusive.…”

Section: Introductionmentioning

confidence: 99%

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Variability and controls of stable carbon isotopic fractionation during aerobic methane oxidation in temperate lakes

Thottathil

Reis²,

Prairie³

2022

Front. Environ. Sci.

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The aerobic oxidation of methane (CH4) by methanotrophic bacteria (MOB) is the major sink of this highly potent greenhouse gas in freshwater environments. Yet, CH4 oxidation is one of the largest uncertain components in predicting the current and future CH4 emissions from these systems. While stable carbon isotopic mass balance is a powerful approach to estimate the extent of CH4 oxidation in situ, its applicability is constrained by the need of a reliable isotopic fractionation factor (αox), which depicts the slower reaction of the heavier stable isotope (13C) during CH4 oxidation. Here we explored the natural variability and the controls of αox across the water column of six temperate lakes using experimental incubation of unamended water samples at different temperatures. We found a large variability of αox (1.004–1.038) with a systematic increase from the surface to the deep layers of lake water columns. Moreover, αox was strongly positively coupled to the abundance of MOB in the γ-proteobacteria class (γ-MOB), which in turn correlated to the concentrations of oxygen and CH4, and to the rates of CH4 oxidation. To enable the applicability in future isotopic mass balance studies, we further developed a general model to predict αox using routinely measured limnological variables. By applying this model to δ13C-CH4 profiles obtained from the study lakes, we show that using a constant αox value in isotopic mass balances can largely misrepresent and undermine patterns of the extent of CH4 oxidation in lakes. Our αox model thus contributes towards more reliable estimations of stable carbon isotope-based quantification of CH4 oxidation and may help to elucidate large scale patterns and drivers of the oxidation-driven mitigation of CH4 emission from lakes.

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In situ aerobic methane oxidation rates in a stratified lake

Hudspeth,

Morningstar,

Mendlovitz

et al. 2024

Limnology & Oceanography

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Microbial aerobic methane oxidation is an important sink for aquatic methane worldwide. Despite its importance to global methane fluxes, few aerobic methane oxidation rates have been obtained in freshwater or marine environments without imposing changes to the microbial community through use of ex situ methods. A novel in situ incubation method for continuous time‐series measurements was used in Jordan Lake, North Carolina, during 2020–2021, to determine reaction kinetics for aerobic methane oxidation rates across a wide range of naturally varying methane (55–1833 nM) and dissolved oxygen (DO; 28–366 μM) concentrations and temperatures (17–30°C). Methane oxidation began immediately at the start of each of 21 incubations and methane oxidation rates were 1st order with respect to methane. The data density allowed for accurate calculation of 1st‐order rate constants, k, that ranged from 0.018 to 0.462 h−1 (R2 > 0.967). Addition of ammonium (20–45 μM) to natural concentrations ranging from 0.057 to 2.4 μM did not change aerobic methane oxidation rate kinetics, suggesting that the natural population of aerobic methane oxidizers in this eutrophic lake was not nitrogen limited. Values of k inversely correlated most strongly with initial DO concentrations (R2 = 0.82) rather than temperature. Values for k increased with Julian day throughout our sampling period, suggesting seasonal influences on methane oxidation via responses to geochemical changes or shifts in microbial community abundance and composition. These experiments demonstrate a high variability in the enzymatic capacity for 1st‐order methane oxidation rates in this eutrophic lake that is tightly and inversely coupled to oxygen concentrations. Measurements of in situ aerobic methane oxidation rate constants allow for the direct quantification and modeling of the microbial community's capacity for methane oxidation over a wide range of natural methane concentrations.

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Phosphorus Regulation of Methane Oxidation in Water From Ice‐Covered Lakes

Cited by 9 publications

References 64 publications

Whither Winter: The Altered Role of Winter for Freshwaters as the Climate Changes

Whither Winter: The Altered Role of Winter for Freshwaters as the Climate Changes

Variability and controls of stable carbon isotopic fractionation during aerobic methane oxidation in temperate lakes

In situ aerobic methane oxidation rates in a stratified lake

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