Contributions of terrestrial organic carbon to northern lake sediments

Gudasz, Cristian; Ruppenthal, Marc; Kalbitz, Karsten; Cerli, Chiara; Fiedler, Sabine; Oelmann, Yvonne; Andersson, August; Karlsson, Jan

doi:10.1002/lol2.10051

Cited by 19 publications

(17 citation statements)

References 43 publications

(69 reference statements)

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“…Our results also suggest that future increases of OM inputs may promote benthic respiration and reduce the large C sink capacity of many northern lakes [62]. Northern lakes are burying increasingly more terrestrial OM into their sediments, primarily due to human activities [63].…”

Section: Discussionmentioning

confidence: 65%

Microbiome functioning depends on individual and interactive effects of the environment and community structure

et al. 2018

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How ecosystem functioning changes with microbial communities remains an open question in natural ecosystems. Both present-day environmental conditions and historical events, such as past differences in dispersal, can have a greater influence over ecosystem function than the diversity or abundance of both taxa and genes. Here, we estimated how individual and interactive effects of microbial community structure defined by diversity and abundance, present-day environmental conditions, and an indicator of historical legacies influenced ecosystem functioning in lake sediments. We studied sediments because they have strong gradients in all three of these ecosystem properties and deliver important functions worldwide. By characterizing bacterial community composition and functional traits at eight sites fed by discrete and contrasting catchments, we found that taxonomic diversity and the normalized abundance of oxidase-encoding genes explained as much variation in CO production as present-day gradients of pH and organic matter quantity and quality. Functional gene diversity was not linked to CO production rates. Surprisingly, the effects of taxonomic diversity and normalized oxidase abundance in the model predicting CO production were attributable to site-level differences in bacterial communities unrelated to the present-day environment, suggesting that colonization history rather than habitat-based filtering indirectly influenced ecosystem functioning. Our findings add to limited evidence that biodiversity and gene abundance explain patterns of microbiome functioning in nature. Yet we highlight among the first time how these relationships depend directly on present-day environmental conditions and indirectly on historical legacies, and so need to be contextualized with these other ecosystem properties.

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Section: Discussionmentioning

confidence: 65%

Microbiome functioning depends on individual and interactive effects of the environment and community structure

et al. 2018

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“…In clear lakes, increased inputs of t‐OM may induce a positive feedback loop, whereby increased CO 2 production stimulates primary production, leading to additional inputs of LMW compounds from algae (Hare et al, ; Schippers, Lürling, & Scheffer, ). In contrast, elevated inputs of t‐OM in dark lakes could lead to an increase in organic matter burial and an increasingly heterotrophic food web (Forsström et al, ; Gudasz et al, ). Future predictions of how t‐OM will impact whole‐lake processes clearly need to consider lake‐specific characteristics, such as water clarity and nutrient availability.…”

Section: Discussionmentioning

confidence: 99%

“…As future influxes of t-OM increase across boreal lakes (Creed et al, 2018;Sobek et al, 2009), these water clarity-dependent responses suggest CO 2 release may be greater in clear lakes with high levels of photo-oxidation at the sediment surface (Lapierre, Guillemette, Breggren, & del Giorgio, 2013). Dark lakes may instead experience a decrease in primary production and shift toward retaining rather than mineralizing terrestrial carbon, such as by burying it in sediment (Gudasz et al, 2017;Isidorova et al, 2015;Seekell et al, 2015). However, over the longer term, the darkening of clear lakes will reduce light exposure on the sediment surface, increasing OM burial and encouraging bacterial communities to develop in sediment pore water that can utilize this material (Judd, Crump, & Kling, 2007;Rofner et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Feasting on terrestrial organic matter: Dining in a dark lake changes microbial decomposition

Fitch

Orland

Willer

et al. 2018

Global Change Biology

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Boreal lakes are major components of the global carbon cycle, partly because of sediment‐bound heterotrophic microorganisms that decompose within‐lake and terrestrially derived organic matter (t‐OM). The ability for sediment bacteria to break down and alter t‐OM may depend on environmental characteristics and community composition. However, the connection between these two potential drivers of decomposition is poorly understood. We tested how bacterial activity changed along experimental gradients in the quality and quantity of t‐OM inputs into littoral sediments of two small boreal lakes, a dark and a clear lake, and measured the abundance of operational taxonomic units and functional genes to identify mechanisms underlying bacterial responses. We found that bacterial production (BP) decreased across lakes with aromatic dissolved organic matter (DOM) in sediment pore water, but the process underlying this pattern differed between lakes. Bacteria in the dark lake invested in the energetically costly production of extracellular enzymes as aromatic DOM increased in availability in the sediments. By contrast, bacteria in the clear lake may have lacked the nutrients and/or genetic potential to degrade aromatic DOM and instead mineralized photo‐degraded OM into CO2. The two lakes differed in community composition, with concentrations of dissolved organic carbon and pH differentiating microbial assemblages. Furthermore, functional genes relating to t‐OM degradation were relatively higher in the dark lake. Our results suggest that future changes in t‐OM inputs to lake sediments will have different effects on carbon cycling depending on the potential for photo‐degradation of OM and composition of resident bacterial communities.

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“…soil erosion, river channel erosion) including mineral and organic material supply or organic matter associated with excessive primary production induced by eutrophication (e.g. Meyers & Ishiwatari, 1995;Gudasz et al, 2017). Causes and mechanisms of water body eutrophication were widely studied during the 1970s and 1980s in a large number of lakes in the Northern hemisphere (Glooschenko et al, 1974;Hecky & Kilham, 1988).…”

Section: Introductionmentioning

confidence: 99%

Regional trends in eutrophication across the Loire river basin during the 20th century based on multi-proxy paleolimnological reconstructions

Foucher

Evrard

Huon

et al. 2020

Agriculture, Ecosystems & Environment

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Excessive inputs of sediment and acceleration of primary production have been observed worldwide in a large number of water bodies. Human-environment interactions were recognized as one of the main drivers of this evolution during the 20th century with the occurrence of major landscape changes and a greater use of agricultural inputs. In this study, we used paleo-production proxies such as chlorophyll-a, organic matter properties (TOC and TN concentrations, δ13C and δ15N) measured in sediment cores dated with fallout 210Pbex and 137Cs activities for reconstructing changes in accumulation rates and sources of organic matter during the recent period of agricultural intensification (1920-2020). In order to record these changes at the regional scale, sediment cores were collected at the outlet of several headwater catchments (n=9), covering a wide range of land covers / land uses across the Loire River basin (117,000 km²), France. The rates of sedimentary organic matter deposition in the studied water bodies accelerated from 1950 onwards (+48%). Between 1950 and 1970, the signature of sedimentary organic matter indicates a dominant contribution of soil-derived inputs. This period corresponds to major landscape modifications across the basin (land consolidation, stream redesign , implementation of tile drains) driving a general acceleration of erosion rates. Then, from 1960 onwards, chlorophyll-a and C/N proxies indicate an increase in primary production coupled with a decrease of terrigenous supply in agricultural catchments. These proxies were strongly correlated to the agricultural inputs during the 1955-1990 period (e.g., r=0.9 between chlorophyll-a content and N inputs), suggesting a progressive eutrophication of these reservoirs driven by increasing fertilizer use. During these 35 years, sedimentary organic matter deposition rates Regional trends in eutrophication across the Loire river basin during the 20 th century based on multi-proxy paleolimnological reconstructions Anthony Foucher (1), Olivier Evrard (1), Sylvain Huon (2), Florence Curie (3), Irène Lefèvre (1), Véronique Vaury (2), Olivier Cerdan (4), Rosalie Vandromme (4), Sébastien Salvador-Blanes (3)

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Contributions of terrestrial organic carbon to northern lake sediments

Cited by 19 publications

References 43 publications

Microbiome functioning depends on individual and interactive effects of the environment and community structure

Microbiome functioning depends on individual and interactive effects of the environment and community structure

Feasting on terrestrial organic matter: Dining in a dark lake changes microbial decomposition

Regional trends in eutrophication across the Loire river basin during the 20th century based on multi-proxy paleolimnological reconstructions

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