Dynamic changes in dissolved organic matter
composition in a Mountain Lake under ice cover and relationships to changes in nutrient
cycling and phytoplankton community composition

Rue, Garrett; Darling, Joshua P.; Graham, Emily B.; Tfaily, Malak M.; McKnight, Diane M.

doi:10.1007/s00027-019-0687-3

Cited by 11 publications

(17 citation statements)

References 106 publications

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“…Studies of higher organisms in ice‐covered lakes are less comprehensive. Only a few papers link the richness and vitality of under‐ice biological communities with the abiotic (i.e., physical and chemical) processes (Comeau et al., 2012; Forsström et al., 2007; Rue et al., 2020; Ventelä et al., 1997). Major progress can be achieved by linking changes in circulation, availability of resources, and communities of plankton, invertebrates and fish, with a further step identifying impacts on food webs.…”

Section: Introductionmentioning

confidence: 99%

Winter Limnology: How do Hydrodynamics and Biogeochemistry Shape Ecosystems Under Ice?

et al. 2021

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The ice-cover period in lakes is increasingly recognized for its distinct combination of physical and biological phenomena and ecological relevance. Knowledge gaps exist where research areas of hydrodynamics, biogeochemistry and biology intersect. For example, density-driven circulation under ice coincides with an expansion of the anoxic zone, but abiotic and biotic controls on oxygen depletion have not been disentangled, and while heterotrophic microorganisms and migrating phytoplankton often thrive at the oxycline, the extent to which physical processes induce fluxes of heat and substrates that support under-ice food webs is uncertain. Similarly, increased irradiance in spring can promote growth of motile phytoplankton or, if radiatively driven convection occurs, more nutritious diatoms, but links between functional trait selection, trophic transfer to zooplankton and fish, and the prevalence of microbial versus classical food webs in seasonally ice-covered lakes remain unclear. Under-ice processes cascade into and from the ice-free season, and are relevant to annual cycling of energy and carbon through aquatic food webs. Understanding the coupling between state transitions and the reorganization of trophic hierarchies is essential for predicting complex ecosystem responses to climate change. In this interdisciplinary review we describe existing knowledge of physical processes in lakes in winter and the parallel developments in under-ice biogeochemistry and ecology. We then illustrate interactions between these processes, identify extant knowledge gaps and present (novel) methods to address outstanding questions.Plain Language Summary Winter is an important but poorly understood period for lake ecosystems at high latitudes. Incoming solar radiation is diminished by ice and (often) snow, flows of oxygen and substrates such as organic matter or nutrients from outside the lake are limited, and wind no longer causes turbulent mixing of the water column. The sediments become a source of heat as well as of solutes which drive denser water toward the bottom. The resulting density stratification creates a template for the development of winter ecosystems. Distinct oxygenated and oxygen-depleted zones will affect microbial community structure and the habitat and behavior of zooplankton and fish. Conditions can rapidly change in spring with increased irradiance and incoming snowmelt. This paper reviews how physical, biogeochemical and biological processes act together to shape aquatic ecosystems in winter and in spring. In addition, we present an overview of the unknowns regarding the interactions between the different processes, which can now be posed due to improved understanding of under-ice hydrodynamics and the nature of lake ice, of biogeochemistry, and of ecology. However, work to date has largely been conducted within distinct disciplines. We therefore outline interdisciplinary approaches that can bridge current knowledge gaps in winter limnology. JANSEN ET AL.

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Section: Introductionmentioning

confidence: 99%

Winter Limnology: How do Hydrodynamics and Biogeochemistry Shape Ecosystems Under Ice?

et al. 2021

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“…Ice cover duration and timing affect ecosystem functions during open water seasons, such as thermal and mixing regimes (Smits et al., 2020; Woolway et al., 2020), oxygen dynamics (Flaim et al., 2020), and primary productivity (Hampton et al., 2017; Sadro et al., 2018b). Ice cover directly controls winter processes such as under‐ice thermal stratification and circulation (Kirillin et al., 2012), oxygen depletion (Granados et al., 2020; Leppi et al., 2016; Obertegger et al., 2017), carbon and nutrient cycling (Denfeld et al., 2018; Powers et al., 2017; Rue et al., 2020), and phytoplankton productivity (Maier et al., 2019). Primary productivity under the ice can make up a significant fraction of total annual productivity in many lakes (Hampton et al., 2017), and dissolved oxygen (DO) dynamics beneath the ice dictate the amount and distribution of suitable habitat for aquatic organisms such as fishes (Stefan et al., 2001).…”

Section: Introductionmentioning

confidence: 99%

Winter Climate and Lake Morphology Control Ice Phenology and Under‐Ice Temperature and Oxygen Regimes in Mountain Lakes

et al. 2021

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“…Therefore, even during winter, when cold conditions limit surface water input, and parts of the lake are covered by ice, preventing physical mixing, the dissolved organic matter (DOM) content is still sufficient to support biological and chemical processes in the lake (Spencer et al, 2014). As mentioned by Rue et al (2019), in winter, phytoplankton activity produces oxygen in the upper water column, the ice cover prevents water mixing, causing oxygen reduction through detritus and sediment decomposition at the lake bottom (Mathias and Barica, 1980;Golosov et al, 2006). The temperature dynamics of a frozen lake are essential in determining the formation and persistence of anoxic conditions (Golosov et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Chironomid (Insecta: Chironomidae) community structure response to hydrological changes in the mid‐1950s in lake Nam Co, Tibetan Plateau

Echeverría‐Galindo

Rigterink

Massaferro

et al. 2023

J Quaternary Science

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The recent rise in air temperatures detected at high altitudes of the Tibetan Plateau has accelerated glacier melt and retreat. Moreover, enhanced monsoonal precipitation has increased runoff and transport of allochthonous material to the lakes. Consequently, water levels are rising, modifying the spatial distribution and composition of local aquatic biota. To infer these environmental and biological changes in recent decades, a 30‐cm‐long sediment core, representing the past ~160 years, from Nam Co, an endorheic lake, was analyzed for subfossil chironomid assemblages and sediment geochemistry. In total, 25 chironomid morphotypes were identified. Nineteen were considered as non‐rare taxa (abundances ≥2%) and six as rare taxa (abundances <2%). Since 1956 ce, higher chironomid richness (S = 19) is evident compared to the previous 100 years. The simultaneous decrease in the abundance of profundal Micropsectra radialis‐type and increase of both Chironomus and Procladius, taxa adapted to more eurytopic and slightly warmer water bodies, indicate increasing water temperatures and intensified primary productivity. The dominance of littoral chironomid assemblages reflects increasing lake water levels, flooded shorelines and expansion of littoral areas driven by increased precipitation and glacial meltwater input both resulting from the increase in air temperatures. This scenario is confirmed by increases in total nitrogen and Zr/Rb ratios, indicating higher productivity and coarser grain size as a consequence of increased runoff via the Niya Qu. These hydrological changes have resulted in a positive water balance that can be linked to an increase in moisture supply from the Indian summer monsoon and glacier melt, reflecting increasing temperatures and precipitation since 1956 ce, ultimately driven by anthropogenic warming.

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Dynamic changes in dissolved organic matter composition in a Mountain Lake under ice cover and relationships to changes in nutrient cycling and phytoplankton community composition

Cited by 11 publications

References 106 publications

Winter Limnology: How do Hydrodynamics and Biogeochemistry Shape Ecosystems Under Ice?

Winter Limnology: How do Hydrodynamics and Biogeochemistry Shape Ecosystems Under Ice?

Winter Climate and Lake Morphology Control Ice Phenology and Under‐Ice Temperature and Oxygen Regimes in Mountain Lakes

Chironomid (Insecta: Chironomidae) community structure response to hydrological changes in the mid‐1950s in lake Nam Co, Tibetan Plateau

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