Behind the Scenes: Mechanisms Regulating Climatic Patterns of Dissolved Organic Carbon Uptake in Headwater Streams

Catalán, Núria; Casas-Ruiz, Joan Pere; Arce, María Isabel; Abril, Meritxell; Bravo, Andrea G.; Campo, Rubén del; Estévez, Edurne; Freixa, Anna; Giménez-Grau, Pau; González-Ferreras, Alexia María; Gomez-Gener, Ll.; Lupon, Anna; Martinez, Aingeru Mayor; Palacín-Lizarbe, Carlos; Poblador, Sílvia; Rasines-Ladero, Rubén; Reyes, Marta; Rodríguez-Castillo, Tamara; Rodríguez‐Lozano, Pablo; Sanpera-Calbet, Isis; Tornero, Irene; Pastor, Ada

doi:10.1029/2018gb005919

Cited by 38 publications

(26 citation statements)

References 75 publications

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“…Streams and rivers retain and transform large amounts of particulate and dissolved organic carbon (DOC) on its downstream route to marine ecosystems [1][2][3]. In-stream uptake of terrestrial DOC exports is central to many biogeochemical and ecological process in streams [4,5] and, as such, several studies have focused on quantifying its rates across ecosystems [1,6,7]. Yet, the drivers of in-stream DOC uptake over time and across streams still remain unclear, which limits our ability to integrate the role of freshwaters on the global biogeochemical cycles.…”

Section: Introductionmentioning

confidence: 99%

“…The source of dissolved organic matter (DOM) strongly influences in-stream DOC uptake by determining the composition of DOM materials [7,8]. In-stream primary producers (e.g., algae) generally release an array of highly reactive biopolymers [9], whereas terrestrially-derived DOM typically contains a higher proportion of aromatic and humic compounds [10].…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…com.es/) frequently updated for communication with the participants and the public. The participant groups conducted two field sampling campaigns in 11 streams (Pastor et al, 2017;Catalán et al, 2018). Site selection and team creation was a long feedback process implying strong communication efforts (Supplementary Figure 1), although the previous knowledge about the sites of the team members strongly facilitated the selection and compilation of background information.…”

Section: Structure and Management Of The First Ecr-cdementioning

confidence: 99%

Early-Career Coordinated Distributed Experiments: Empowerment Through Collaboration

et al. 2020

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Coordinated distributed experiments (CDEs) enable the study of large-scale ecological patterns in geographically dispersed areas, while simultaneously providing broad academic and personal benefits for the participants. However, the effective involvement of early-career researchers (ECRs) presents major challenges. Here, we analyze the benefits and challenges of the first CDE exclusively led and conducted by ECRs (i.e. ECR-CDE), which sets a baseline for similar CDEs, and we provide recommendations for successful CDE execution. ECR-CDEs achieve most of the outcomes identified in conventional CDEs as well as extensive benefits for the young cohort of researchers, including: (i) receiving scientific credit, (ii) peer-training in new concepts and methods, (iii) developing leadership and communication skills, (iv) promoting a peer network among ECRs, and (v) building on individual engagement and independence. We also discuss the challenges of ECR-CDEs, which are mainly derived from the lack of independence and instability of the participants, and we suggest mechanisms to address them, such as resource reallocation and communication strategies. We conclude that ECR-CDEs can be a relevant tool to empower ECRs across disciplines by fostering their training, networking and personal well-being.

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“…Moreover, the occurrence of contaminant removal in the natural environment should be established first because the change in concentration of a contaminant does not always mean its removal. From this point of view, the most objective way to evaluate the self-purification capacity of streams, rivers [33], and throughflow lakes [34,35] is to compare the quantity of a contaminant entering and leaving the lake or section of a river between an upstream and downstream location.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Self-Purification Capacity of Surface Waters in Lake Baikal Watershed

Semenov

Силаев

et al. 2019

Water

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The removal of trace metals (TM), dissolved organic carbon (DOC), mineral nitrogen (Nmin.), and polycyclic aromatic hydrocarbons (PAHs) from the water of Lake Baikal and its tributaries was evaluated. The contaminant removal rate (CRR) and the contaminant removal capacity (CRC) were used as water self-purification parameters. The CRR was calculated as the difference between contaminant mass flow rates at downstream and upstream gauging stations. The CRC was calculated as the quotient of the CRR and the change in water discharge between downstream and upstream gauging stations. Whether the CRR and CRC have positive or negative values depends on whether contaminant release or removal occurs in the water body. The CRR depends on the size of the water body. The lowest and the highest CRRs observed for Baikal were equal to −15 mg/s (PAHs) to −7327 g/s (DOC), whereas the highest PAH and DOC removal rates observed for Selenga River (the major Baikal tributary) in summer were equal to −9 mg/s and −3190 g/s correspondingly. The highest PAH and DOC removal rates observed for small tributaries were equal to 0.0004 mg/s and −0.7 g/s respectively. The amplitude of annual CRR oscillations depends on contaminant abundance. The highest amplitude was typical for most abundant contaminants such as Nmin. and DOC. In unpolluted sections of the Selenga River the highest rates of N and C removal (−85 g/s and −3190 g/s, respectively) were observed in summer and the lowest rates (4 g/s and 3869 g/s, respectively) were observed in the spring. The lowest amplitude was typical for PAHs and some low-abundance TM such as V and Ni. The highest summer rates of V and Ni removal were equal to −378 mg/s and −155 mg/s respectively, whereas lowest spring rates are equal to 296 mg/s and 220 mg/s. The intermediate CRR amplitudes were typical for most abundant TM such as Sr, Al, and Fe. The spatial CRR variability depends on water chemistry and the presence of pollution sources. The lowest (up to 38 g/s) rates of Nmin. removal was observed for polluted lower Selenga sections characterized by low water mineralization and high DOC concentrations. The highest rates (−85 g/s) were observed for unpolluted upper sections. Seepage loss from the river to groundwater was also recognized as an important means of contaminant removal. The CRC values depend mostly on water residence time. The DOC removing capacity value of Baikal (−26 g/m3) were lower than those of Selenga in summer (−35 g/m3) but higher than the CRCs of all tributaries during the other seasons (from 30 mg/m3 to −10 g/m3).

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Behind the Scenes: Mechanisms Regulating Climatic Patterns of Dissolved Organic Carbon Uptake in Headwater Streams

Cited by 38 publications

References 75 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

Early-Career Coordinated Distributed Experiments: Empowerment Through Collaboration

Assessing the Self-Purification Capacity of Surface Waters in Lake Baikal Watershed

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