Does nutrient enrichment decouple algal–bacterial production in periphyton?

Scott, J. Thad; Back, Jeffrey A.; Taylor, Jason M.; King, Ryan S.

doi:10.1899/07-108.1

Cited by 91 publications

(80 citation statements)

References 47 publications

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“…In oligotrophic environments, algae rely on grazer-generated or bacterial-regenerated nutrients (SCOTT et al, 2008) . Biomass accrual has been reported to follow a non-linear increase due to reduced mass transfer velocity, clogged micro channels, detachment by high water velocity, grazing activity and accumulation of toxic substances (SABATER and ADMIRAAL, 2005, and references within).…”

Section: Resultsmentioning

confidence: 99%

“…discrimination) against nitrate or ammonium. An additional complication while interpreting the results is that nutrient regeneration has been identified as a process significantly affecting nutrient availability to cells growing within a polysaccharide matrix (SCOTT et al, 2008). A recent study by RIBOT et al (2012) described a shorter plume in a highly seasonal river, where discharges from the wastewater treatment plant account for 100% of river discharge in summer, and the impact of the effluent was greater (d 15 N-NH 4 + up to 55‰) with an increasing trend in biomass nitrogen isotope composition as water travelled downstream (d 15 N-TN ≈ 25‰ the highest value).…”

Section: Resultsmentioning

confidence: 99%

“…Taken together, its relative fast growth, its sessile condition and the ease with which it can be collected and analysed make epilithon a suitable candidate to be used as a monitoring tool in subsidized rivers. SCOTT et al (2008) reported that an increase in nutrient load favoured algal productivity, as evaluated in streams with a wide range of N and P concentrations, but also that productivity reaches a saturation point. Visual inspection of rocks in the Grand River showed heavy colonization and the was performed on an ion chromatograph (Dionex Corp., USA).…”

Section: Discussionmentioning

confidence: 99%

“…This could be due to the mixing of allochthonous carbon in high order rivers such as the Grand River (-26‰. ), also referred to by SCOTT et al (2008), in which a large contribution of atmospheric CO 2 (invasion) produces depleted in-stream d 13 C (atmospheric d 13 C-CO2 is -8.2‰). Different taxa will respond to inorganic carbon availability according to their different methods of carbon acquisition, yet a relation between the size of the watershed and the isotope composition of attached algae was found, with values of -23‰ in summer (FINLAY, 2004).…”

Section: C-tcmentioning

confidence: 99%

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Epilithon isotope composition as an environmental archive in rivers receiving wastewater

Cejudo

Schiff

Aravena

2014

rseau

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Epilithon is a complex community of autotrophic and heterotrophic organisms that includes inert, organic and inorganic material and is attached to the surface of submersed rocks. Water samples collected in the Grand River (southwestern Ontario) in April 2011 showed that ammonium concentrations decreased downstream, whereas nitrate varied, largely dependent on weather conditions (concentrations of both chemical species were higher during winter). Epilithon δ15N-TN downstream from the Kitchener wastewater treatment plant oscillated between 0.4 to 23.2‰, and δ13C-TC around -27‰. The wastewater treatment plant effluent consisted of δ15N-NO3- between 12 and 16‰, with a decreasing trend as it traveled downstream; δ15N-NH4+ became enriched downstream (as high as 31‰). Average values for δ13C-DIC were -10.1‰ and δ13C-DOC -26.8‰. It is proposed that the nitrogen and carbon isotope composition of epilithon could be used as a short- or medium-term environmental archive, as it reflects in-stream processes, such as ammonia oxidation, in a river impacted by treated wastewater. The interpretation provided here was limited due to the ample range of events and potential sources, specifically when the nitrogen isotopic composition of nitrate and ammonium was similar. Epilithon is easily collected, processed and analysed and proved to be valuable tool to describe changes in river and stream geochemistry.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: C-tcmentioning

confidence: 99%

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Epilithon isotope composition as an environmental archive in rivers receiving wastewater

Cejudo

Schiff

Aravena

2014

rseau

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“…Interactions between algae and bacteria can also be completive. Competition for nutrients and spaces has been observed in many nutrient-limiting environments Rier and Stevenson 2002;Scott et al 2008), but may not be the case in wastewater. Algae can raise water pH, increase dissolved oxygen content during photosynthesis, and release inhibitory chemicals, which can be detrimental to certain bacteria, while bacteria can in turn affect algae by killing or lysing or by changing the microenvironment (Amin et al 2012;Subashchandrabose et al 2011;Wang et al 2016a).…”

Section: Biodegradationmentioning

confidence: 99%

Removal of pharmaceuticals and personal care products from wastewater using algae-based technologies: a review

Wang

Liu

et al. 2017

Rev Environ Sci Biotechnol

150

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Pharmaceuticals and personal care products (PPCPs) consist of a variety of compounds extensively used for the treatment of human and animal diseases and for health or cosmetic reasons. PPCPs are considered as emerging environmental contaminants due to their ubiquitous presence in the environment and high environmental risks. In wastewater treatment plants using conventional activated sludge processes, many PPCPs cannot be efficiently removed. Therefore, there is an increasing need for more effective and cost-efficiency ways of removing PPCPs while treating wastewater. Algae-based technologies have recently attracted growing attentions for their potential application in wastewater treatment and hazardous contaminant removal, which are advantages in reducing operation cost while generating valuable products and sequestrating greenhouse gases at the same time. This work reviews the up-to date researches to reveal potential toxic effects of PPCPs on algae and algae-bacteria consortia, identify mechanisms involved in PPCP removal, and assess the fate of PPCPs in algae-based treatment systems. Current researches suggest that algae and algae-bacteria consortia have great potentials in PPCP removal but more works are required before algae-based technologies can be implemented in large scales. Knowledge gaps are identified and further research focuses are proposed in this review.

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Identifying congruence in stream assemblage thresholds in response to nutrient and sediment gradients for limit setting

Wagenhoff

Clapcott

Lau

et al. 2017

Ecological Applications

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The setting of numeric instream objectives (effects-based criteria) and catchment limits for major agricultural stressors, such as nutrients and fine sediment, is a promising policy instrument to prevent or reduce degradation of stream ecosystem health. We explored the suitability of assemblage thresholds, defined as a point at which a small increase in a stressor will result in a disproportionally large change in assemblage structure relative to other points across the stressor gradient, to inform instream nutrient and sediment objectives. Identification and comparison of thresholds for macroinvertebrate, periphyton, and bacterial assemblages aimed at making the setting of objectives more robust and may further provide a better understanding of the underlying mechanisms of nutrient and fine sediment effects. Gradient forest, a novel approach to assemblage threshold identification based on regression-tree-based random forest models for individual taxa, allowed inclusion of multiple predictors to strengthen the evidence of cause and effect between stressors and multispecies responses. The most prominent macroinvertebrate and periphyton assemblage threshold across the nitrogen (N) gradient was located at very low levels and mainly attributed to declines of multiple taxa. This provided strong evidence for stream assemblages being significantly affected when N concentrations exceed reference conditions and for effects cascading through the ecosystem. The most prominent macroinvertebrate assemblage threshold across a gradient of suspended fine sediment was also located at very low levels and attributed to declines of multiple taxa. However, this threshold did not correspond with periphyton assemblage thresholds, suggesting that the sensitivity of macroinvertebrate assemblages is unrelated to sediment effects on periphyton assemblages. Overall, the spectrum of N concentrations and fine sediment levels within which these stream assemblages changed most dramatically were relatively narrow given the wide gradients tested. We conclude that assemblage thresholds can inform the setting of generic instream nutrient and sediment objectives for stream ecosystem health. For example, the most stringent objective for instream N concentration should be set at values similar to reference concentrations for full protection of sensitive taxa or overall stream biodiversity. To avoid severe degradation of stream biodiversity, the least stringent N objective should stay well below the point where significant turnover subsided.

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Does nutrient enrichment decouple algal–bacterial production in periphyton?

Cited by 91 publications

References 47 publications

Epilithon isotope composition as an environmental archive in rivers receiving wastewater

Epilithon isotope composition as an environmental archive in rivers receiving wastewater

Removal of pharmaceuticals and personal care products from wastewater using algae-based technologies: a review

Identifying congruence in stream assemblage thresholds in response to nutrient and sediment gradients for limit setting

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