Effects of salinity on the decay of the freshwater macrophyte, Triglochin procerum

Roache, Michael; Bailey, Paul; Boon, Paul I.

doi:10.1016/j.aquabot.2005.07.014

Cited by 61 publications

(38 citation statements)

References 23 publications

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“…In contrast, BG activity was reduced by salt exposure, suggesting that decomposition of cellulose-rich organic matter could have been inhibited. These results are consistent with the findings of Roache et al (2006), who observed that experimental salt additions similar to those used in our study inhibited microbial enzyme activity and plant litter decomposition in a freshwater wetland. The salt exposure used in our enzyme experiment was approximately double the highest recorded winter salt exposures in local streams (Figure 1), making direct extrapolation of our results somewhat difficult.…”

Section: Discussionsupporting

confidence: 83%

“…Photosynthesis (oxygen production) of lotic algae was enhanced by moderate ion concentrations (5�5800 mS cm �1 ) and reduced by higher levels (�10,200 mS cm �1 ; Silva and Davies 1999). Experimental salt additions inhibited pooled extracellular enzyme activity (fluorescein diacetate hydrolysis) of wetland microbial communities (Roache et al 2006), suggesting that road salt additions could also inhibit specific extracellular enzyme activities in lotic periphyton.…”

Section: Introductionmentioning

confidence: 99%

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Effects of simulated short-term road salt exposure on lotic periphyton function

Cook

Francoeur

2013

Journal of Freshwater Ecology

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Road salt application and resulting entrance of salt-laden runoff into streams are common winter events, yet little information exists about their influence on lotic periphyton function. We measured extracellular enzyme and photosynthetic activities of natural winter lotic periphyton communities under various short-term laboratory salt exposures. Short-term exposure to increased concentrations of salt reduced the photosynthetic activity of the periphyton but photosynthetic activity was restored by replacing saltamended water with ambient stream water. Salt exposure also reduced periphytic -glucosidase activity but not the activity of phosphatase or leucine aminopeptidase. Elevated, but realistic, short-term salt exposures reduced the functioning of lotic periphyton communities. Further work will be necessary to understand the long-term effects of increased salt concentrations on periphyton and extracellular enzyme activity.

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Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Effects of simulated short-term road salt exposure on lotic periphyton function

Cook

Francoeur

2013

Journal of Freshwater Ecology

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“…Theoretically, increased salinity accelerates the mineralization of organic matter and the release of NH 4 þ (Noe et al 2013) as thermodynamically favorable metabolic pathways, such as Fe(III) or SO 4 2À reduction (discussed above), increase in importance. However, this expectation is not always met, and the literature includes reports of salinity increasing (Weston et al 2006, Craft 2007, decreasing (Roache et al 2006), or having no effect (Ibañez et al 1999) on organic matter decomposition in wetlands (See Carbon metabolism, below).…”

Section: Biogeochemical Cyclingmentioning

confidence: 99%

A global perspective on wetland salinization: ecological consequences of a growing threat to freshwater wetlands

et al. 2015

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Abstract. Salinization, a widespread threat to the structure and ecological functioning of inland and coastal wetlands, is currently occurring at an unprecedented rate and geographic scale. The causes of salinization are diverse and include alterations to freshwater flows, land-clearance, irrigation, disposal of wastewater effluent, sea level rise, storm surges, and applications of de-icing salts. Climate change and anthropogenic modifications to the hydrologic cycle are expected to further increase the extent and severity of wetland salinization. Salinization alters the fundamental physicochemical nature of the soil-water environment, increasing ionic concentrations and altering chemical equilibria and mineral solubility. Increased concentrations of solutes, especially sulfate, alter the biogeochemical cycling of major elements including carbon, nitrogen, phosphorus, sulfur, iron, and silica. The effects of salinization on wetland biogeochemistry typically include decreased inorganic nitrogen removal (with implications for water quality and climate regulation), decreased carbon storage (with implications for climate regulation and wetland accretion), and increased generation of toxic sulfides (with implications for nutrient cycling and the health/functioning of wetland biota). Indeed, increased salt and sulfide concentrations induce physiological stress in wetland biota and ultimately can result in large shifts in wetland communities and their associated ecosystem functions. The productivity and composition of freshwater species assemblages will be highly altered, and there is a high potential for the disruption of existing interspecific interactions. Although there is a wealth of information on how salinization impacts individual ecosystem components, relatively few studies have addressed the complex and often non-linear feedbacks that determine ecosystem-scale responses or considered how wetland salinization will affect landscape-level processes. Although the salinization of wetlands may be unavoidable in many cases, these systems may also prove to be a fertile testing ground for broader ecological theories including (but not limited to): investigations into alternative stable states and tipping points, trophic cascades, disturbance-recovery processes, and the role of historical events and landscape context in driving community response to disturbance.

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“…In coastal water bodies, salinity can vary seasonally and can be influenced by changes in water levels, precipitation, evaporation (Schallenberg et al, 2003), hydrological alterations (Howard & Mendelssohn, 1999) and anthropogenic activities (Roache et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Salinity effects on photosynthetic pigments, proline, biomass and nitric oxide in Salvinia auriculata Aubl.

et al. 2017

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Cite as: Gomes, M.A.C. et al. Salinity effects on photosynthetic pigments, proline, biomass and nitric oxide in Salvinia auriculata Aubl. Acta Limnologica Brasiliensia, 2017, vol. 29, e9. Abstract: Aims: Effects of salt stress on the physiology of Salvinia auriculata were investigated. Method: Plants were supplemented with 0, 50, 100 and 150 mmol L -1 NaCl and incubated for 5 days. NO content was evaluated after 2 hours and 5 days. Photosynthetic pigments, proline and nutrients were analyzed after 5 days. Major Results: Higher chlorophyll a content was observed in plants treated with 50 mmol L -1 , decreasing in higher NaCl concentrations, while chorophyll b content decreased with increasing NaCl concentrations. Exposure to 50 mmol L -1 NaCl increased biomass, while higher concentrations caused loss of biomass. Ca, K and Mg decreased with increasing NaCl concentrations, and the Na/K ratio was significantly increased at 150 mmol L -1 NaCl. Proline increased significantly at 150 mmol L -1 . Extracellular NO content increased after 2 hours, with significantly higher NO concentrations in roots observed at 50 mmol L -1 . Decreases in NO content were observed after 5 days. Conclusions: The results indicate that moderate salinity induces NO production earlier during incubation, probably associated to signaling for the production of compounds that assist in stress tolerance. At higher concentrations, this tolerance is reduced. This allows for further understanding of the physiological and biochemical mechanisms associated with the adaptation of this macrophyte to saline conditions, which, in turn, affect this species ecology and distribution in coastal areas.Keywords: Salvinia auriculata; salinity stress; nitric oxide; clorophyll; NaCl; macrophyte.Resumo: Objetivos: Efeitos do estresse salino sobre a fisiologia de Salvinia auriculata foram investigados. Metodologia: As plantas foram expostas a 0, 50, 100 e 150 mmol de NaCl L -1 e incubadas durante 5 dias. O conteúdo de NO foi avaliado após 2 horas e 5 dias. Pigmentos fotossintéticos, prolina e nutrientes foram analisados após 5 dias. Resultados Principais: Observou-se maior teor de clorofila a em plantas tratadas com 50 mmol L -1

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Effects of salinity on the decay of the freshwater macrophyte, Triglochin procerum

Cited by 61 publications

References 23 publications

Effects of simulated short-term road salt exposure on lotic periphyton function

Effects of simulated short-term road salt exposure on lotic periphyton function

A global perspective on wetland salinization: ecological consequences of a growing threat to freshwater wetlands

Salinity effects on photosynthetic pigments, proline, biomass and nitric oxide in Salvinia auriculata Aubl.

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