Eutrophication and recovery of a Lake inferred from sedimentary diatoms originating from different habitats

Бо, Лю; McLean, Colleen E.; Long, David T.; Steinman, Alan D.; Stevenson, R. Jan

doi:10.1016/j.scitotenv.2018.02.174

Cited by 36 publications

(10 citation statements)

References 48 publications

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“…With respect to conventional approach of rock scraping, this approach is mostly biased towards benthic diatom species [26]. Depending on the research question, targeting only this group of taxa may suffice, however for sampling diatoms to answer questions regarding finescale freshwater health, it is essential to consider the presence of planktonic diatom species [80][81][82][83]. In terms of sampling method, benthic kick-net sampling detected more planktonic diatom species than rock scraping alone.…”

Section: Discussionmentioning

confidence: 99%

Freshwater diatom biomonitoring through benthic kick-net metabarcoding

et al. 2020

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Biomonitoring is an essential tool for assessing ecological conditions and informing management strategies. The application of DNA metabarcoding and high throughput sequencing has improved data quantity and resolution for biomonitoring of taxa such as macroinvertebrates, yet, there remains the need to optimise these methods for other taxonomic groups. Diatoms have a longstanding history in freshwater biomonitoring as bioindicators of water quality status. However, multi-substrate periphyton collection, a common diatom sampling practice, is time-consuming and thus costly in terms of labour. This study examined whether the benthic kick-net technique used for macroinvertebrate biomonitoring could be applied to bulk-sample diatoms for metabarcoding. To test this approach, we collected samples using both conventional multi-substrate microhabitat periphyton collections and bulk-tissue kick-net methodologies in parallel from replicated sites with different habitat status (good/fair). We found there was no significant difference in community assemblages between conventional periphyton collection and kick-net methodologies or site status, but there was significant difference between diatom communities depending on site (P = 0.042). These results show the diatom taxonomic coverage achieved through DNA metabarcoding of kick-net is suitable for ecological biomonitoring applications. The shift to a more robust sampling approach and capturing diatoms as well as macroinvertebrates in a single sampling event has the potential to significantly improve efficiency of biomonitoring programmes that currently only use the kick-net technique to sample macroinvertebrates.

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Section: Discussionmentioning

confidence: 99%

Freshwater diatom biomonitoring through benthic kick-net metabarcoding

et al. 2020

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“…In contrast to reports for the largest drinking water reservoir (Daecheong) in South Korea, the sestonic Chl-a exhibited a peak during the spring season of the dry year, while the BOD response was almost minimal [25,31]. Due to the rapidly changing climatic conditions, drought and flood dynamics studies are of great significance [60][61][62]. Furthermore, South Korean freshwater ecosystems are at an increased risk of damage [63].…”

Section: Impact Of Flood and Drought Dynamicsmentioning

confidence: 92%

Seasonal Water Quality and Algal Responses to Monsoon-Mediated Nutrient Enrichment, Flow Regime, Drought, and Flood in a Drinking Water Reservoir

Mamun

Atique

Kim

et al. 2021

IJERPH

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Freshwater reservoirs are a crucial source of urban drinking water worldwide; thus, long-term evaluations of critical water quality determinants are essential. We conducted this study in a large drinking water reservoir for 11 years (2010–2020). The variabilities of ambient nutrients and total suspended solids (TSS) throughout the seasonal monsoon-mediated flow regime influenced algal chlorophyll (Chl-a) levels. The study determined the role of the monsoon-mediated flow regime on reservoir water chemistry. The reservoir conditions were mesotrophic to eutrophic based on nitrogen (N) and phosphorus (P) concentrations. An occasional total coliform bacteria (TCB) count of 16,000 MPN per 100 mL was recorded in the reservoir, presenting a significant risk of waterborne diseases among children. A Mann–Kendall test identified a consistent increase in water temperature, conductivity, and chemical oxygen demand (COD) over the study period, limiting a sustainable water supply. The drought and flood regime mediated by the monsoon resulted in large heterogeneities in Chl-a, TCB, TSS, and nutrients (N, P), indicating its role as a key regulator of the ecological functioning of the reservoir. The ambient N:P ratio is a reliable predictor of sestonic Chl-a productivity, and the reservoir was P-limited. Total phosphorus (TP) had a strong negative correlation (R2 = 0.59, p < 0.05) with the outflow from the dam, while both the TSS (R2 = 0.50) and Chl-a (R2 = 0.32, p < 0.05) had a strong positive correlation with the outflow. A seasonal trophic state index revealed oligo-mesotrophic conditions, indicating a limited risk of eutrophication and a positive outcome for long-term management. In conclusion, the Asian monsoon largely controlled the flood and drought conditions and manipulated the flow regime. Exceedingly intensive crop farming in the basin may lead to oligotrophic nutrient enrichment. Although the reservoir water quality was good, we strongly recommend stringent action to alleviate sewage, nutrient, and pollutant inflows to the reservoir.

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“…Zheng et al (2021) also found the release of COD reached the highest on the rst day and nally remained stable. The reason for the higher release of COD at the beginning of the experiment was due to the fast decomposition of small molecular substances attached to the surface of corncob and the release of soluble carbon from the plants (Liu et al, 2018). With the extension of the release time, the inside organics of PBs were further decomposed and released and the COD concentration in the aqueous solution mainly came from the hydrolysis of the cellulose material.…”

Section: Kinetics Of Carbon Release Of H-pbsmentioning

confidence: 99%

Enhance nitrogen removal in bioretention cells with addition of hydrothermal pre-treated pine barks as external carbon source

Tuo

Cao

et al. 2021

Preprint

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The problem of poor carbon source is a common factor limiting the nutrients removal in bioretention cells (BRCs). This study aimed to investigate the feasibility of using modified biomass in BRCs filled with a mixture of fly ash ceramsite and pumice fillers to enhance nitrogen removal. Different pretreatment methods (hydrothermal-treated, acid-treated and alkali-treated) were attempted, and hydrothermal pretreatment showed a best performance in carbon release ability. The scanning electron microscopy showed that the lignin in hydrothermal pretreated pine barks (H-PBs) was destroyed, and the fiber structure became thinner with more irregular folds, which improved the accessibility of cellulose and attachment of microorganisms. The addition of H-PBs significantly enhanced the nutrients removal in BRCs, and the removal rates of TN and NO3−-N increased by 23.25% and 38.22% compared with those in BRC-A (without external carbon source), but the removal rate of NH4+-N was inferior to BRC-A. Besides, the large carbon release amount of H-PBs did not deteriorate the effluent quality, with COD removal rate of 87.98% in the 48 d. These results indicate that the BRCs by adding H-PBs could intensify the denitrification process.

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Eutrophication and recovery of a Lake inferred from sedimentary diatoms originating from different habitats

Cited by 36 publications

References 48 publications

Freshwater diatom biomonitoring through benthic kick-net metabarcoding

Freshwater diatom biomonitoring through benthic kick-net metabarcoding

Seasonal Water Quality and Algal Responses to Monsoon-Mediated Nutrient Enrichment, Flow Regime, Drought, and Flood in a Drinking Water Reservoir

Enhance nitrogen removal in bioretention cells with addition of hydrothermal pre-treated pine barks as external carbon source

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