Hydrologic control on winter dissolved oxygen mediates arsenic cycling in a small subarctic lake

Palmer, Michael; Chételat, John; Jamieson, Heather E.; Richardson, Murray; Amyot, Marc

doi:10.1002/lno.11556

Cited by 24 publications

(37 citation statements)

References 47 publications

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“…Thaw events can also mix the water column and influence SWI redox conditions (Schroth et al 2015;Joung et al 2017). Consequently, thaws likely impact N cycling in frozen lakes by exerting strong control on redox-sensitive biogeochemical cycles under ice (Joung et al 2017;Palmer et al 2020). Such events are becoming more frequent as the climate changes (Huntington et al 2009), but our understanding of thaw impacts on N cycling is limited because these events are challenging to sample (Block et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Ice cover and thaw events influence nitrogen partitioning and concentration in two shallow eutrophic lakes

et al. 2021

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The frequency and duration of lake ice cover is rapidly declining in the Northern Hemisphere. Limited research in oligotrophic and mesotrophic lakes suggests that extended periods of ice cover influence nitrogen (N) cycling by promoting nitrate (NO 3 -) accumulation. However, ice cover impacts on N cycling in shallow, high-nutrient, eutrophic lakes remains poorly understood. To understand drivers of under-ice water column N concentrations, we examined concurrent under-ice N concentration, hydrometerological, and physicochemical time series from two shallow eutrophic systems during sustained cold and thaw periods. We compared data from both lakes during a historically cold winter to assess how different lake-watershed physical configurations and algal biomass affected under-ice N cycling. We also used time series data from consecutive winters to assess the influence of a mild versus a historically cold winter on under-ice N cycling in one of the lakes. We found that ice cover promoted NO 3 depletion when sustained cold disconnected lakes from watershed loading, but the amount of depletion varied between lakes and was enhanced during the colder winter. Thaw events increased NO 3 concentrations compared to late winter and altered the concentration and distribution of N species in the water column, but the degree and nature of increased NO 3 varied with thaw severity, the source of meltwater, timing, and lakewatershed morphometry. Our results suggest that winters with shorter ice duration and more thaw events may result in less NO 3 depletion and higher peak NO 3 concentrations in shallow eutrophic lakes, with potential implications for N cycling and phytoplankton ecology.

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Section: Introductionmentioning

confidence: 99%

Ice cover and thaw events influence nitrogen partitioning and concentration in two shallow eutrophic lakes

et al. 2021

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“…The appearance below detection limits and thus the non‐significant role of minerals such as iron and manganese on diatoms could be explained by the physical characteristics of the subarctic ponds studied, as dissolved heavy metals are more common in deeper anoxic subarctic lakes (Palmer et al., 2020). Earlier studies in lotic (Passy, 2010) and oceanic (Hutchins & Bruland, 1998) systems have found iron and manganese concentrations to have a distinctive influence on diatom species richness.…”

Section: Discussionmentioning

confidence: 99%

Observing diatom diversity and community composition along environmental gradients in subarctic mountain ponds

et al. 2022

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Cold subarctic pond ecosystems will be threatened due to the increase in global temperatures. Therefore, it is important to gain more knowledge on how their biota may respond to global warming. The aim of this research was to illustrate the variability in diatom species richness and community composition along environmental gradients in northernmost Finland and Norway and reveal the variables most strongly associated with diatom biodiversity. We also compared diatom biodiversity among different biotope types and placed emphasis on the distribution of rare diatom taxa. A total of 100 subarctic ponds from the Finnish and Norwegian Lapland covering an elevational gradient of 8–887 m above sea level were sampled. A generalised linear model and hierarchical partitioning were used to identify variables associated with diatom species richness. To identify variables associated with diatom community composition, a non‐metric multidimensional scaling ordination was performed. Finally, a principal component analysis and permutational multivariate analysis of variance were used for the investigation of environmental and biotic differences among biotope types. Water pH, aluminium concentration, and air temperature best explained the variation in species richness and community composition. Diatom species richness and community composition did not differ among the biotope types, but environmental variables in pine forests differed significantly from other biotope types. Many diatom species occupied the entire elevational gradient, while rare taxa seemed to appear at the ends of the elevational gradient as well around the mid‐elevational zone. We found that elevation was not sufficient to explain the variation in diatom species richness and community composition, but diatom biodiversity was shaped by a variety of local‐scale environmental variables, some of which are in turn correlated with elevation. Our findings suggest that local abiotic factors and especially water chemistry are important factors in describing the variability in diatom community composition and species richness in subarctic ponds. It seems that the lowest and the highest elevations provide suitable habitats for rare diatom taxa that have unique environmental preferences but some of the rare taxa were also constrained to mid elevations. Our study provides new insights into the role of local abiotic variables in shaping subarctic mountain pond biodiversity. We urge researchers not only to study elevational gradients per se in mountain areas, but also pay special attention to environmental covariates that may play a notable role in maintaining freshwater biodiversity in the subarctic.

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“…Similarly, in subarctic Sweden, spring overturn emissions of CO 2 and CH 4 were strongly regulated by the length of wintertime ice cover (Jansen et al 2019). The impacts of winter physical characteristics on chemical limnological condition are exemplified by the study of Palmer et al (2021), who show that the wintertime inflow of oxygenated streamwater to a subarctic lake affected by past mining activities substantially reduces the development of water column anoxia. This, in turn diminishes the reductive dissolution of arsenic‐bearing iron (oxy)hydroxides and under‐ice arsenic concentrations.…”

Section: Changing Hydrology Of Lakes and Impacts On Biogeochemistrymentioning

confidence: 99%

Element cycling and aquatic function in a changing Arctic

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Sejr

et al. 2021

Limnology & Oceanography

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Arctic systems are under intense pressure from anthropogenic activities, with climate change in particular inducing rapid change in the interlinked cycling of water and various biogeochemical constituents, and thus also the ecological processes that depend on these cycles. This special issue for Limnology and Oceanography explores our changing Arctic, with contributions across the watershed‐lake‐river‐estuary‐coastal‐open ocean continuum, and foci ranging from physical and chemical processes to food webs. Some specific areas of focus include legacy pollution from mines, greenhouse gas emissions from lakes, riverine fluxes of materials, as well as the balance between primary production and respiration in the water column and benthos in marine systems. While varied in focus, as a collection the papers in this special issue do provide direction into key avenues for future effort. For example, while Arctic systems are historically understudied due to financial and logistical costs, long‐term monitoring efforts are clearly critical for documenting change, despite the challenges. In freshwater systems, predicting biogeochemistry, and thus ecology, based on landscape characteristics and lake morphology is an ongoing practice that seems particularly promising for both upscaling and decisions on focusing future research effort. In marine and coastal systems, complementing specific local studies with large‐scale cross‐disciplinary monitoring programs is clearly required for elucidating long‐term trends. While baseline research is critical for documenting the Arctic as it currently stands, and constitutes the majority of current research efforts, ongoing support for long‐term observatories and expanding remote sensing capabilities is a fundamental requirement for tracking change.

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Hydrologic control on winter dissolved oxygen mediates arsenic cycling in a small subarctic lake

Cited by 24 publications

References 47 publications

Ice cover and thaw events influence nitrogen partitioning and concentration in two shallow eutrophic lakes

Ice cover and thaw events influence nitrogen partitioning and concentration in two shallow eutrophic lakes

Observing diatom diversity and community composition along environmental gradients in subarctic mountain ponds

Element cycling and aquatic function in a changing Arctic

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