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Silva, E. I. L.; Davies, Ronald W.

doi:10.1023/a:1003827807547

Cited by 11 publications

(4 citation statements)

References 38 publications

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“…Unfortunately, we found no field study that investigated stream metabolism in relation to increasing salinity from a semiarid or arid region. From humid regions, no response [41] and an initial increase in metabolism followed by a reduction at higher salt concentrations were observed [48], whereas a mesocosm study with similar salinity concentration ranges reported a negative correlation [53] (see tables 1 and 2 for concentrations). Measures of biomass production are often restricted to specific components.…”

Section: (C) Metabolism and Biomass Productionmentioning

confidence: 95%

Salinity impacts on river ecosystem processes: a critical mini-review

Berger

Frör

Schäfer

2018

Phil. Trans. R. Soc. B

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In many dry parts of the world, salinization of water resources threatens freshwater biodiversity and the livelihood of people. However, ecological impact studies remain scarce. Here, we review field-observations of salinity impacts on ecosystem processes such as leaf decomposition, metabolism, biomass production and nutrient cycling, with a special emphasis on dryland ecosystems. In addition, we discuss the potential linkages of these processes to ecosystem service delivery—the benefits that humans derive from ecosystems—as additional nature conservation arguments and the challenges associated with this endeavour. This article is part of the theme issue ‘Salt in freshwaters: causes, ecological consequences and future prospects'.

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Section: (C) Metabolism and Biomass Productionmentioning

confidence: 95%

Salinity impacts on river ecosystem processes: a critical mini-review

Berger

Frör

Schäfer

2018

Phil. Trans. R. Soc. B

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“…In this context, secondary salinization of stream ecosystems has served as an instructive example of structural changes of freshwater communities in terms of diversity loss (Mitchell and Richards 1992;Short et al 1991;Williams et al 1997), density increase (Bunn and Davis 1992) and functional alterations (Harrel and Dorris 1968;Silva and Davies 1999 Ecol (2010) 44:177-193 185 salt (for example seven species in a river affected by oilfields, Short et al 1991; 9 species in rivers affected by road-salting, Williams et al 1997). Diptera, Coleoptera, Heteroptera, Ephemertoptera, Odonata, Crustacea, Mollusca, Oligochaeta and Hydrachnidia species living in the Reventón Rambla were able to cope with the environmental constraints (high salinity, high temperature, floods and droughts).…”

Section: Community Composition and Biogeographical Interestmentioning

confidence: 99%

Seasonal dynamics of macroinvertebrate communities in a semiarid saline spring stream with contrasting environmental conditions

2009

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Semiarid saline streams are rare aquatic ecosystem types. Their constituent biota is expected to have adapted evolutionarily to strong hydrological variability and salinity stress; however, their ecology is not well known. In this study, we quantify the seasonal changes in the structure of the macroinvertebrate community in the Reventón Rambla (south-eastern Spain), a permanent saline spring stream which is included in a drainage system consisting of ephemeral dry channels (so-called ''ramblas''). Seasonal patterns of community structure were studied in two reaches with contrasting environmental regimes using univariate and multivariate statistics. The upstream site showed more stable environmental conditions than the downstream site, and both sites also differed with regard to species richness, and structural and functional group attributes. On a seasonal basis, community dissimilarity was high during periods when both sites were isolated during summer droughts but dissimilarity decreased when both sites were connected through surface flow. Furthermore, the communities tended to show cyclical trajectories in multivariate ordination space. Rather than being related to salinity stress, these patterns seemed to track the hydrological disturbance regime of this rambla system. Spates tended to disrupt communities, while signs of recovery were evident during low-flow periods. Results suggest that salinity fluctuation does not pose a severe abiotic constraint to these adapted macroinvertebrate communities. Their suits of functional properties provide them with the necessary traits to recover quickly from natural disturbance. While human-caused salinization of streams severely impacts communities eventually reducing their recovery potential, our results suggest that communities in natural saline streams may show similar responses to hydrological disturbance as communities from non-saline streams.

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“…Hence, the timing of salt pulses into aquatic ecosystem might be as important as the prior exposure of the ecosystem to salt. At some sites, increased respiration corresponded to increases in benthic NO 3 uptake, indicating chloride pulses might have stimulated benthic metabolism (Silva & Davies, 1999).…”

Section: Discussionmentioning

confidence: 98%

“…Palabras clave: ciclos biogeoquímicos acuáticos, sal de carreteras, flujo de nutrientes, flujo de oxígeno, interfase sedimentoagua Salt pulses can also affect microbial respiration rates in wetland sediments, on aquatic biofilms, and in association with terrestrial organic matter decomposition (Almeida Júnior et al, 2020;Chambers et al, 2011;Martínez et al, 2020;Oliveira et al, 2021;Silva & Davies, 1999). At high chloride concentrations (> 1000 mg Cl -/L), evidence of ionic stress causing a metabolic shutdown is often inferred through reductions in microbial respiration rates after chloride exposure (although see: Chambers et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Add a dash of salt? Effects of road de-icing salt (NaCl) on benthic respiration and nutrient fluxes in freshwater sediments

Williams¹,

Frost²,

Ginn³

et al. 2023

Limnetica

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Winter road salt applications are increasing chloride concentrations in many freshwater ecosystems. This trend is alarming, giv¬en chloride’s potential to impair aquatic ecosystems. Short- and long-term exposure to salt could affect ecosystem metabolism and nutrient cycles. Here, we examine connections between chloride concentrations, water quality conditions, benthic respi¬ration, and sediment-water nutrient flux throughout a large (722 km2) lake and its catchment. Aquatic locations experiencing high concentrations of chloride are indicators of anthropogenic activities and are often associated with additional pollutants. We used sediment core flow-through incubations under ambient and enriched chloride concentrations to determine the effects of road salt on benthic respiration and nutrient fluxes in stream, stormwater pond, and lake sites. Salt (as sodium chloride) ad¬ditions caused a significant overall increase in benthic respiration. Acute exposure to road salt caused the strongest increase in benthic respiration when water was warm and at sites that had low (< 50 mg Cl-/L) or high (> 400 mg Cl-/L) ambient chloride concentrations or when water was cold and sites had intermediate (100-400 mg Cl-/L) ambient chloride concentrations. Nitrate flux responded less uniformly to salt additions. Depending on waterbody type and season, ambient nitrate flux into the sediment was similar, increased, or decreased post-chloride addition. Dissolved phosphorus flux was not significantly impacted by salt additions. Across lake and stream sites, our results supported the hypothesis that chloride causes increased respiration while nutrient cycles were weakly and inconsistently altered under experimental pulse road salt additions.

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Untitled

Cited by 11 publications

References 38 publications

Salinity impacts on river ecosystem processes: a critical mini-review

Salinity impacts on river ecosystem processes: a critical mini-review

Seasonal dynamics of macroinvertebrate communities in a semiarid saline spring stream with contrasting environmental conditions

Add a dash of salt? Effects of road de-icing salt (NaCl) on benthic respiration and nutrient fluxes in freshwater sediments

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