Spatial and seasonal changes of arsenic species in Lake Taihu in relation to eutrophication

Yan, Changzhou; Che, Feifei; Zeng, Liqing; Wang, Zaosheng; Du, Miaomiao; Wei, Qunshan; Wang, Zhenhong; Wang, Dapeng; Zhuang, Zhuo

doi:10.1016/j.scitotenv.2016.04.132

Cited by 67 publications

(13 citation statements)

References 47 publications

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“…The spatial characteristics of TN in Lake Qiandaohu from 2001 to 2018 are shown in Figure 6. In comparison to other freshwater lakes in China, such as Lake Taihu and Lake Dianchi [7,[36][37][38][39], TN in Lake Qiandaohu remained relatively low for many years. In terms of the spatial-temporal distribution, strong spatiotemporal variability in TN was observed throughout the lake.…”

Section: Spatiotemporal Variation Characteristics Of Tnmentioning

confidence: 84%

Spatiotemporal Variations in Nitrogen and Phosphorus in a Large Man-Made Lake and Their Relationships with Human Activities

Zhou

Wang

Zhang

et al. 2020

Water

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Nitrogen and phosphorus excessive enrichment are major causes of water eutrophication, and variations in nutrients enrichment are strongly influenced by human activities. In this study, annual average water quality from 2001 to 2018 was used to explore the spatiotemporal variations in total nitrogen (TN) and total phosphorus (TP) and their relationships with human activities. Spatially, TN and TP concentrations exhibited significant variations across the five sub-lake zones, and their values were relatively higher in the NW lake zone than the other sub-lake zones. Temporally, TN concentration exhibited weak correlations with years in the NW (R2 = 0.37, p < 0.05) and NE (R2 = 0.43, p < 0.05) lake zones and significant and positive correlations with years in the SW (R2 = 0.62, p < 0.05), SE (R2 = 0.79, p < 0.05), and C (R2 = 0.84, p < 0.05) lake zones. TP concentration exhibited decreasing trends in all lake zones except the NW lake zone (R2 = 0.37, p < 0.05), its value shows a relatively low level and is the restrictive factor to algal growth. The trophic state of the Lake Qiandaohu was determined as mesotrophic. Gross domestic product (GDP) and construction land exhibited strong correlations with TN and TP. Moreover, agriculture nonpoint source pollution was the largest contributor to the excessive enrichment of TN and TP, resulting in water eutrophication. In addition, aquaculture was another major source of nutrients starting in 1999. Although the managers of Lake Qiandaohu implemented a protection-oriented fishery policy, good results cannot be easily achieved with a unilateral policy concerning environmental protection. Thus, comprehensive policies may be more effective than unilateral policies.

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Section: Spatiotemporal Variation Characteristics Of Tnmentioning

confidence: 84%

Spatiotemporal Variations in Nitrogen and Phosphorus in a Large Man-Made Lake and Their Relationships with Human Activities

Zhou

Wang

Zhang

et al. 2020

Water

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“…The Taguchi method, used to optimize the experimental design, is the same being applied during our previous study [ 1 ]. Briefly, four common environmental factors including As V , N, P and pH were considered each at three levels ( Table 1 ) [ 2 ]. The detailed experimental conditions were obtained using a L9 (3 4 ) orthogonal array ( Table 2 ).…”

Section: Methods Detailsmentioning

confidence: 99%

Methods of determing biokinetics of arsenate accumulation and release in Microcystis aeruginosa regulated by common environmental factors: Practical implications for enhanced bioremediation

et al. 2018

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“…A huge diversity of arsenic species may be found in experiments with algae or biofilms when they are exposed to different P concentrations, showing the complexity of the role of P in arsenic biospeciation. For instance, in a field study [144], the role of total P on the biotransformation of arsenic was tested and suggested that the increase of arsenite mobility in water by microorganisms was enhanced under low phosphate conditions, after arsenate was rapidly taken up by microalgae via phosphate transporters and then reduced to arsenite.…”

Section: Changes In Arsenic Toxicity Through Microbiological Biospecimentioning

confidence: 99%

“…Production of methylarsenicals was generally observed as a detoxification process and was detected inside of microalgal cells and fluvial biofilms, especially under eutrophic conditions (e.g., [119,144]). The remarkable production of methylarsenicals by freshwater green algae at high P concentrations was also demonstrated by Baker et al (2016) [145], calling into question the conclusion made by some researchers that low P concentration is essential in the production of these organoarsenicals (e.g., [114,146,147]).…”

Section: Changes In Arsenic Toxicity Through Microbiological Biospecimentioning

confidence: 99%

Biotic and Abiotic Factors Influencing Arsenic Biogeochemistry and Toxicity in Fluvial Ecosystems: A Review

Barral-Fraga

Barral

MacNeill

et al. 2020

IJERPH

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This review is focused on the biogeochemistry of arsenic in freshwaters and, especially, on the key role that benthic microalgae and prokaryotic communities from biofilms play together in through speciation, distribution, and cycling. These microorganisms incorporate the dominant iAs (inorganic arsenic) form and may transform it to other arsenic forms through metabolic or detoxifying processes. These transformations have a big impact on the environmental behavior of arsenic because different chemical forms exhibit differences in mobility and toxicity. Moreover, exposure to toxicants may alter the physiology and structure of biofilms, leading to changes in ecosystem function and trophic relations. In this review we also explain how microorganisms (i.e., biofilms) can influence the effects of arsenic exposure on other key constituents of aquatic ecosystems such as fish. At the end, we present two real cases of fluvial systems with different origins of arsenic exposure (natural vs. anthropogenic) that have improved our comprehension of arsenic biogeochemistry and toxicity in freshwaters, the Pampean streams (Argentina) and the Anllóns River (Galicia, Spain). We finish with a briefly discussion of what we consider as future research needs on this topic. This work especially contributes to the general understanding of biofilms influencing arsenic biogeochemistry and highlights the strong impact of nutrient availability on arsenic toxicity for freshwater (micro) organisms.

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Spatial and seasonal changes of arsenic species in Lake Taihu in relation to eutrophication

Cited by 67 publications

References 47 publications

Spatiotemporal Variations in Nitrogen and Phosphorus in a Large Man-Made Lake and Their Relationships with Human Activities

Spatiotemporal Variations in Nitrogen and Phosphorus in a Large Man-Made Lake and Their Relationships with Human Activities

Methods of determing biokinetics of arsenate accumulation and release in Microcystis aeruginosa regulated by common environmental factors: Practical implications for enhanced bioremediation

Biotic and Abiotic Factors Influencing Arsenic Biogeochemistry and Toxicity in Fluvial Ecosystems: A Review

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