Synthesis reveals heterogeneous changes in the metabolism and emission of greenhouse gases of drying rivers DOI Creative Commons
Margot Sepp, Juan David González‐Trujillo, Rafael Marcé

et al.

Environmental Research Letters, Journal Year: 2024, Volume and Issue: 19(11), P. 113002 - 113002

Published: Sept. 9, 2024

Abstract More than half of the world’s rivers experience occasional, seasonal, or permanent drying, and this may increase because climate change. Drying, i.e. severe reduction in water flow even leading to streambed desiccation, can have a profound impact on available aquatic habitat, biodiversity, functions rivers. Yet, date, it is unclear whether similar drying events comparable zones result changes ecosystem processes, such as river metabolism greenhouse gas (GHG) emissions. Here, we synthesise detected effects gross primary production (GPP) respiration (ER), well emissions GHGs (CO 2 , CH 4 N O) streams. We examined current scientific literature detailing these variables when measured either field laboratory. extracted data from 30 studies analysing GPP ER responses, GHG another 35 studies. Then, conducted meta-analysis determine magnitude direction varied across systems studied, according type (natural human-induced) severity drying. In general, enhanced (under low flows) emissions, decreased CO O The hydrological phases throughout (low flow, isolated pools, desiccation) had differential were generally more induced rather just periods flow. Desiccation strongly reduced GPP, likely die-off algae, while its negative effect was smaller. Greater decrease under desiccation would lead emissions; our results showed accordingly that increased Furthermore, depending study type. Experimental micro- mesocosms demonstrated greater studies, thus extrapolation real conditions should be done with caution. Overall, effects’ inconsistent zones, except for Mediterranean zone, where showing both Our synthesis contribute identifying worldwide trends patterns riverine associated global change impacts stream ecosystems.

Language: Английский

The Importance of Ditches and Canals in Global Inland Water CO2 and N2O Budgets DOI Creative Commons
Teresa Silverthorn, Joachim Audet, Chris Evans

et al.

Global Change Biology, Journal Year: 2025, Volume and Issue: 31(3)

Published: March 1, 2025

Ditches and canals are omitted from global budgets of inland water emissions, despite research showing them to be emitters greenhouse gases (GHGs). Here, we synthesize data across climate zones land use types show, for the first time, that ditches emit notable amounts carbon dioxide (CO2) nitrous oxide (N2O). had higher per-area emissions CO2 N2O than ponds, lakes, reservoirs, likely due high nutrient inputs. Preliminary upscaling showed inclusion would increase by 0.6%-1% 3%-9%. Trophic state influenced while complex drivers difficult disentangle at scale. This highlights importance including in GHG informs more accurate reporting anthropogenic national inventories.

Language: Английский

Citations

3
Alternating Drying and Flowing Phases Control Stream Metabolism Through Short‐ and Long‐Term Effects: Insights From a River Network DOI Creative Commons
Naiara López‐Rojo, Romain Sarremejane, Arnaud Foulquier

et al.

Journal of Geophysical Research Biogeosciences, Journal Year: 2025, Volume and Issue: 130(3)

Published: March 1, 2025

Abstract Stream metabolism is a key biogeochemical process in river networks, synthesizing the balance between gross primary production (GPP) and ecosystem respiration (ER). Globally, more rivers streams are drying due to climate change water abstraction for human uses this can alter organic carbon residence time leading decoupled ER terrestrial matter supply. Although consequences of on CO 2 emissions have been recently quantified, its effects stream still poorly studied. We addressed long‐term rewetting events by monitoring oxygen dynamics at 20 reaches across network, including perennial (PR) nonperennial (NPR) one year. also calculated several climatic land use variables characterized local abiotic conditions biofilm sediment communities five sampling dates. was significantly higher NPR than PR demonstrating situ metabolism. When analyzing drivers GPP, we found direct positive effect negative GPP. Drying altered microbial community composition with algal from NPRs being different those PRs. In short‐term, total consumption (respiration) during positively related duration precedent nonflow period. Our results show that had an important both short‐ long term, supporting need global estimates

Language: Английский

Citations

0
Projections of streamflow intermittence under climate change in European drying river networks DOI Creative Commons
Louise Mimeau, Annika Künne, Alexandre Devers

et al.

Hydrology and earth system sciences, Journal Year: 2025, Volume and Issue: 29(6), P. 1615 - 1636

Published: March 25, 2025

Abstract. Climate and land use changes, as well human water flow alteration, are causing worldwide shifts in river dynamics. During the last decades, low flows, intermittence, drying have increased many regions of world, including Europe. This trend is projected to continue amplify future, resulting more frequent intense hydrological droughts. However, due a lack data studies on temporary rivers past, little known about processes governing development intermittence drying, their timing frequency, or long-term evolution under climate change. Moreover, understanding impact change up crucial assess aquatic ecosystems, biodiversity functional integrity freshwater systems. study one first present future projections intermittent networks analyse changes patterns at high spatial temporal resolution. Flow were produced using hybrid model forced with projection from 1985 until 2100 three scenarios six European networks. The studied watershed areas situated different biogeographic regions, located Spain, France, Croatia, Hungary, Czechia, Finland, range 150 350 km2. Additionally, indicators developed calculated (1) characteristics spells reach scale (2) extent network various time intervals. results for all show that increase expand space, despite differences amplitude changes. Temporally, addition average frequency events, duration increases over year. Seasonal expected result an earlier onset longer persistence throughout Summer maxima likely shift spring, extended periods additional occurring autumn extending into winter season some regions. A analysis extreme events shows dry observed recent years could become regular by end century. we observe transitions perennial reaches future.

Language: Английский

Citations

0
Toward Modeling Continental‐Scale Inland Water Carbon Dioxide Emissions DOI Creative Commons
Brian Saccardi, Craig Brinkerhoff, Colin J. Gleason

et al.

AGU Advances, Journal Year: 2024, Volume and Issue: 5(6)

Published: Nov. 4, 2024

Abstract Inland waters emit significant amounts of carbon dioxide (CO 2 ) to the atmosphere; however, global magnitude and source distribution inland water CO emissions remain uncertain. These fluxes have previously been “statistically upscaled” by independently estimating dissolved concentrations gas exchange velocities calculate fluxes. This scaling, while robust defensible, has known limitations in representing spatial variability. Here, we develop calibrate a transport model for continental United States, simulating transformation >22 million hydraulically connected rivers, lakes, reservoirs. We estimate 25% lower compared upscaling estimates forced same observational calibration data. While precise are limited resolution parameterizations, our suggests that stream corridor production dominates over groundwater inputs at scale. Our results further suggest lack networks scalable metabolic models aquatic most salient barriers coupling with other Earth system components.

Language: Английский

Citations

1
Synthesis reveals heterogeneous changes in the metabolism and emission of greenhouse gases of drying rivers DOI Creative Commons
Margot Sepp, Juan David González‐Trujillo, Rafael Marcé

et al.

Environmental Research Letters, Journal Year: 2024, Volume and Issue: 19(11), P. 113002 - 113002

Published: Sept. 9, 2024

Abstract More than half of the world’s rivers experience occasional, seasonal, or permanent drying, and this may increase because climate change. Drying, i.e. severe reduction in water flow even leading to streambed desiccation, can have a profound impact on available aquatic habitat, biodiversity, functions rivers. Yet, date, it is unclear whether similar drying events comparable zones result changes ecosystem processes, such as river metabolism greenhouse gas (GHG) emissions. Here, we synthesise detected effects gross primary production (GPP) respiration (ER), well emissions GHGs (CO 2 , CH 4 N O) streams. We examined current scientific literature detailing these variables when measured either field laboratory. extracted data from 30 studies analysing GPP ER responses, GHG another 35 studies. Then, conducted meta-analysis determine magnitude direction varied across systems studied, according type (natural human-induced) severity drying. In general, enhanced (under low flows) emissions, decreased CO O The hydrological phases throughout (low flow, isolated pools, desiccation) had differential were generally more induced rather just periods flow. Desiccation strongly reduced GPP, likely die-off algae, while its negative effect was smaller. Greater decrease under desiccation would lead emissions; our results showed accordingly that increased Furthermore, depending study type. Experimental micro- mesocosms demonstrated greater studies, thus extrapolation real conditions should be done with caution. Overall, effects’ inconsistent zones, except for Mediterranean zone, where showing both Our synthesis contribute identifying worldwide trends patterns riverine associated global change impacts stream ecosystems.

Language: Английский

Citations

0