DOM composition alters ecosystem function during microbial processing of isolated sources

D’Andrilli, Juliana; Junker, James R.; Smith, Heidi J.; Scholl, Eric A.; Foreman, Christine M.

doi:10.1007/s10533-018-00534-5

Cited by 109 publications

(66 citation statements)

References 54 publications

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“…Therefore, our results seemingly indicate that, during the leaf litter period, there were shifts from plant-to microbial-derived DOM that could switch in-stream DOC cycling from net release to net uptake. These findings are in agreement with the high variability in DOM materials observed in this scenario as well as with general temporal patterns of leaf litter decomposition [47,48], thus reflecting the importance of this process to understand in-stream DOM dynamics during the leaf litter fall period.…”

Section: Influence Of Dom Availability and Composition On In-stream Nsupporting

confidence: 89%

“…We found a large variability in U DOC within and among scenarios. Recent works have attributed variation in DOC uptake to heterogeneities in the DOM pool and the associated microbial community [7,47]. However, results from the multiple regression models indicate that stream DOM composition barely influenced in-stream net DOC uptake in this stream (Table 2, Figure 5).…”

Section: Influence Of Dom Availability and Composition On In-stream Nmentioning

confidence: 89%

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Influence of Dissolved Organic Matter Sources on In-Stream Net Dissolved Organic Carbon Uptake in a Mediterranean Stream

Lupon

Catalán

Martı́

et al. 2020

Water

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Studies exploring how different sources of dissolved organic matter (DOM) influence in-stream dissolved organic carbon (DOC) uptake at the ecosystem scale are scarce in the literature. To fill this knowledge gap, we examined the relationship between DOM sources and in-stream net DOC uptake (UDOC) in a sub-humid Mediterranean stream. We considered four reach-scale scenarios occurring under natural conditions that differed in predominant DOM sources (groundwater, leaf litter, and/or upstream water). Results showed that groundwater inputs favored in-stream net DOC uptake, while leaf litter inputs promoted in-stream net DOC release. However, there was no clear effect of DOM source mixing on the magnitude of UDOC. Further, the variability in UDOC within and among scenarios was mostly explained by stream DOC concentration, suggesting that DOC availability limits microbial activity in this stream. DOM composition became a controlling factor of UDOC variability only during the leaf litter period, when stream DOC concentration was the highest. Together, these results suggest that the capacity of headwater forested streams to process DOC is closely tied to the availability of different DOM sources and how they vary over time and along the river network.

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Section: Influence Of Dom Availability and Composition On In-stream Nsupporting

confidence: 89%

Section: Influence Of Dom Availability and Composition On In-stream Nmentioning

confidence: 89%

Influence of Dissolved Organic Matter Sources on In-Stream Net Dissolved Organic Carbon Uptake in a Mediterranean Stream

Lupon

Catalán

Martı́

et al. 2020

Water

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“…As microorganisms are key mediators for the transformation of DOM (Carlson et al, 2004;Young et al, 2004;Jiao et al, 2010;D'Andrilli et al, 2019), we hypothesized that the variable DOM input following groundwater recharge potentially affected the bacterial communities in the aquifers. Here, we focused on the temporal variation of DOM composition and age in well H41, which showed the strongest responses to groundwater recharge, disregarding already reported microbiological differences between the transect sites (Opitz et al, 2014).…”

Section: Responses Of the In Situ Biospherementioning

confidence: 99%

Fueling Diversity in the Subsurface: Composition and Age of Dissolved Organic Matter in the Critical Zone

et al. 2019

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Surface ecosystems are rapidly changing on a global scale and it is important to understand how this influences aquifers in the subsurface, as groundwater quality is a major concern for future generations. Dissolved organic matter (DOM) contains molecular and isotopic signals from surface-derived inputs as well as from the biotic and abiotic subsurface environment and is therefore ideal to study the connectivity between both environments. We evaluated a 3-year time series of DOM composition using ultrahigh resolution mass spectrometry and age using 14 C accelerator mass spectrometry along a hillslope well transect in the fractured bedrock of the Hainich Critical Zone Exploratory, Germany. We found a wide range of DOM 14 C depletion, from 14 C = −47.9 to 14 C = −782.4, within different zones of the shallow groundwater. The 14 C content of DOM mirrored the connectivity of the aquifers to the surface. The composition of DOM was highly interrelated with its 14 C age. The proportions of surface-derived DOM components decreased with DOM age, whereas microorganismderived DOM components increased. The intensity of surface-sourced DOM signals differed between the wells and likely reflected the hydrological complexity of fracturedrock environments. During recharge, DOM was more enriched in 14 C, contained more surface-derived molecular components and was more diverse. As a potential response to the varying DOM substrate, bacterial 16S rRNA gene analysis revealed community evolution and increased bacterial diversity during recharge. The influx of diverse, surface-derived DOM potentially fueled evolution within the autochthonous bacterial communities, as in contrast to DOM, the bacterial community did not retreat to the initial diversity and community composition during the recession period. Our results demonstrate on the one hand that combined analyses of the composition and age of groundwater DOM strongly contribute to the understanding of interconnections, community evolution and the functioning of subsurface ecosystems and on the other hand that changes in surface ecosystems have an imprint on subsurface ecosystems.

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“…Given that past ENSO-related revents have been linked to predictable changes in the Amazon carbon balance 34 , it is likely that future events may also in uence regional carbon cycling. Overall, we hypothesize that ENSO-related events will increase arrhythmic variations in exported DOM compositions and will impact future CO 2 uxes from the Amazon River, possibly increasing pCO 2 from respiration of mobilized DOM compounds [31][32] .…”

Section: Implications Of Future Enso Events On Amazonian Dom Export Amentioning

confidence: 98%

“…thought to be directly exported into the Amazon River coastal plume downstream [26][27] , whereas the more photo-and biolabile compounds are thought to be mineralized instream 6,24,28 . Given that the Amazon River outgasses 0.47-1.4 Pg C year -1 as CO 2 to the atmosphere [29][30] , the high DOC concentrations of its tributaries 18 and the microbial preference to respire biolabile DOM [31][32] , it's likely that a portion of Amazon riverine DOM contributes to CO 2 uxes 24,33 .…”

mentioning

confidence: 99%

Arrhythmia in the Amazon: La Niña influence on riverine organic molecular signatures

Kurek¹,

Stubbins²,

Drake³

et al. 2020

Preprint

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As climate-driven El Niño Southern Oscillation (ENSO) events are projected to increase in frequency and severity, much attention has focused on impacts regarding ecosystem productivity and carbon balance in Amazonian rainforests, with little attention given to carbon dynamics in fluvial ecosystems. We compared the wet 2012 La Niña period to the following normal hydrologic period in the Amazon River. Elevated water flux during the La Niña was accompanied by dilution of inorganic ion concentrations. Furthermore, the La Niña period exported 2.77 TgCyr-1 more dissolved organic carbon (DOC) than the normal period, an increase greater than annual Mississippi River DOC export. Using ultra-high-resolution mass spectrometry, we detected both seasonal and inter-annual variations in dissolved organic matter (DOM) compositions, revealing that DOM exported during the dry season and the normal period was more aliphatic, whereas compounds in the wet season and following the La Niña event were more aromatic, with ramifications for its environmental role. Furthermore, compounds were highly correlated to a 6-month lag in Pacific temperature and pressure anomalies, demonstrating that ENSO events impact DOM compositions exported to the Atlantic Ocean.

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DOM composition alters ecosystem function during microbial processing of isolated sources

Cited by 109 publications

References 54 publications

Influence of Dissolved Organic Matter Sources on In-Stream Net Dissolved Organic Carbon Uptake in a Mediterranean Stream

Influence of Dissolved Organic Matter Sources on In-Stream Net Dissolved Organic Carbon Uptake in a Mediterranean Stream

Fueling Diversity in the Subsurface: Composition and Age of Dissolved Organic Matter in the Critical Zone

Arrhythmia in the Amazon: La Niña influence on riverine organic molecular signatures

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