Contrary effects of flow intermittence and land uses on organic matter decomposition in a Mediterranean river basin

Viza, Aida; Muñoz, Isabel; Oliva, Francesc; Menéndez, M.

doi:10.1016/j.scitotenv.2021.151424

Cited by 12 publications

(4 citation statements)

References 51 publications

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“…Oak leaf mass loss and associated parameters after eight weeks were highest in litter continuously exposed to the stream, lowest in litter exclusively exposed to the riparian area, and intermediate in litter subjected to a combination of riparian/stream exposure. These trends have been consistently observed in studies comparing submerged with dry litter conditions (Treplin and Zimmer 2012;Yue et al 2018;Viza et al 2022;Costello et al 2022), and in leaves subjected to a riparian-to-stream pathway (Abelho and Descals 2019), this is, to our knowledge, the first study to also point to this effect in stream-toriparia litter movements. Our results confirm that litter decomposition dynamics are dependent on exposure patterns (i.e., movement sequence and duration of exposure at each habitat): While a short terrestrial pre-conditioning period resulted in a negative legacy effect for recipient aquatic communities, litter extensively conditioned in-stream seems to promote litter processing through foraging of fungi by terrestrial invertebrates.…”

Section: Discussionsupporting

confidence: 78%

Reciprocal stream–riparian fluxes: effects of distinct exposure patterns on litter decomposition

Simões,

Gonçalves,

Jones

et al. 2023

Aquat Ecol

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Resource fluxes at the stream–riparian interface are a vital contributor to both systems’ energy budgets. The effect of distinct litter exposure patterns—direction of the riparia–stream movement and duration of exposure at each habitat—however, remains to be elucidated. In this field experiment, oak leaves in fine and coarse mesh bags were either exposed to a stream-to-riparia or riparia-to-stream movement sequence for distinct periods (2:6, 4:4, or 6:2 weeks). After 8 weeks, ash-free mass loss, microbial activity, and fungal biomass were compared in leaves undergoing inverse movement sequences (e.g., 2-week exposure to the riparian area at the beginning vs. end of the colonization period). Mass loss in coarse mesh bags was negatively affected when leaves were previously exposed to a short (2 weeks) terrestrial pre-conditioning period, despite higher microbial activity and fungal biomass, when compared to the inverse movement. This effect on mass loss was neutralized by longer terrestrial exposures that likely allowed for a more thorough conditioning of the leaves, through extended leaching and terrestrial microbial colonization. Our results suggest that terrestrial pre-conditioning periods of < 2 weeks lead to litter-quality legacy effects in tough leaves, to which aquatic communities respond through lower substrate degradation efficiency, hindering stream decomposition. Contrastingly, oak aquatic pre-conditioning, regardless of duration, provides riparian communities with a high-quality resource, promoting litter processing through grazing behavior. As climate-induced hydrological shifts may result in altered provision/quality of detritus subsidies at the stream–riparia interface, we suggest that assessments of decomposition dynamics should consider the entire litter conditioning history.

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Section: Discussionsupporting

confidence: 78%

Reciprocal stream–riparian fluxes: effects of distinct exposure patterns on litter decomposition

Simões,

Gonçalves,

Jones

et al. 2023

Aquat Ecol

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“…There are additional secondary consequences on ecosystem services from such toxins. Decomposition rates of leaf litter are enhanced by nutrients in Mediterranean rivers of because their increase microbial activity [101] and some organic contaminants have been demonstrated to have the opposite impact [102]. A seasonal change in hydrologic processes makes Mediterranean rivers particularly susceptible to contamination and water extraction in the dry season [103].…”

Section: Anthropogenic Disturbancementioning

confidence: 99%

Climate Change Critique on Dams and Anthropogenic Impact to Mediterranean Mountains for Freshwater Ecosystem - a Review

Soomro,

Guo,

Shi

et al. 2023

Pol. J. Environ. Stud.

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The average annual temperature, precipitation, and evaporation patterns are some of the characteristics which indicate to a globe where climate is rapidly changing. It remains uncertain regarding how this rapid climate change will impact freshwater biota; however the consequences could be absolutely catastrophic. It is urgently needed to better adapt and maintain the fragile system that comprises the Mediterranean ecosystems. Water shortages and changes in the land use can impact water quality and the watershed's ecosystem. Changes in temperature and precipitation trends can increase the intensity of land use, the increase of water depletion, and the degradation of water quality. The effects of climate change on eco hydrology change runoff, evaporation, surface storage, and soil moisture, that all have immediate effects on the biota and biodiversity of region. It is supported by studies on eco hydrological impacts on local watersheds. The spatial pattern and surface water dynamics of watershed systems are utilized as a perspective using which to examine the hydrologic consequences. The impacts of climate change on rainfall, evaporation, soil humidity, lakes level, and quality of water, habitats, species migration, biodiversity, and economies have been investigated. The potential climatic impacts on watershed ecosystems are determined by a spatiotemporal assessment of variations in temperature and precipitation projections from a multimodal ensemble. The susceptibility of a watershed changed depending over its geographic region, terrain, and human influence. As such a manner of dealing with climate change, improving watershed systems could be beneficial. Various techniques have

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“…At different timescales, different processes emerge. At the seasonal scale, Viza et al (2022) found that the intermittent flow regime of a Mediterranean river basin contributes to reducing organic matter decomposition rates. More generally, the effects of droughts on DOC transport have being extensively investigated (e.g., Ahmadi et al, 2019;Humbert et al, 2015;Mehring et al, 2013;Wu et al, 2022).…”

Section: Seasonal and Storm Event-based Dynamics Of Dissolved Organic...mentioning

confidence: 99%

Seasonal and Storm Event‐Based Dynamics of Dissolved Organic Carbon (DOC) Concentration in a Mediterranean Headwater Catchment

Senatore,

Corrente,

Argento

et al. 2023

Water Resources Research

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This study investigates the spatial and temporal dynamics of Dissolved Organic carbon (DOC) concentration in a Mediterranean headwater catchment (Turbolo River catchment, southern Italy) equipped with two multi‐parameter sondes providing more than two‐year (May 2019–November 2021) continuous high‐frequency measurements of several DOC‐related parameters. The sondes were installed in two nested sections, a quasi‐pristine upstream sub‐catchment and a downstream outlet with anthropogenic water quality disturbances. DOC estimates were achieved by correcting the fluorescent dissolved organic matter—fDOM—values through an original procedure not requiring extensive laboratory measurements. Then, DOC dynamics at the seasonal and storm event scales were analyzed. At the seasonal scale, results confirmed the climate control on DOC production, with increasing background concentrations in hot and dry summer months. The hydrological regulation proved crucial for DOC mobilization and export, with the top 10th percentile of discharge associated with up to 79% of the total DOC yield. The analysis at the storm scale using flushing and hysteresis indices highlighted substantial differences between the two catchments. In the steeper upstream catchment, the limited capability of preserving hydraulic connection over time with DOC sources determined the prevalence of transport as the limiting factor to DOC export. In the downstream catchment, transport‐ and source‐limited processes were observed almost equally. The correlation between the hysteretic behavior and antecedent precipitation was not linear since the process reverted to transport‐limited for high accumulated rainfall values. Exploiting high‐resolution measurements, the study provided insights into DOC export dynamics in nested headwater catchments at multiple time scales.

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Contrary effects of flow intermittence and land uses on organic matter decomposition in a Mediterranean river basin

Cited by 12 publications

References 51 publications

Reciprocal stream–riparian fluxes: effects of distinct exposure patterns on litter decomposition

Reciprocal stream–riparian fluxes: effects of distinct exposure patterns on litter decomposition

Climate Change Critique on Dams and Anthropogenic Impact to Mediterranean Mountains for Freshwater Ecosystem - a Review

Seasonal and Storm Event‐Based Dynamics of Dissolved Organic Carbon (DOC) Concentration in a Mediterranean Headwater Catchment

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