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Repeated hydrogen peroxide dosing briefly reduces cyanobacterial blooms and microcystin while increasing fecal bacteria indicators in a eutrophic pond

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journal of Environmental Sciences 2023年第2期124卷 522-543页

作者： Mark W.Lusty chris.opher j.gobler School of Marine and Atmospheric Sciences Stony Brook UniversitySouthamptonNY 11968USA

This study explored the effects of H_(2)O_(2)on Cyanobacteria and non-target microbes using fluorometry,microscopy,flow cytometry,and high throughput DNA sequencing of the 16S rRNA gene during a series of mesocosm and whole-ecosystem experiments in a eutrophic pond in NY,*** addition of H_(2)O_(2)(8 mg/L)significantly reduced Cyanobacteria concentrations during a majority of experiments(66%;6 of 9)and significantly increased eukaryotic green and unicellular brown algae in 78%and 45%of experiments,*** heterotrophic bacteria declined significantly following H_(2)O_(2)addition in all experiments,bacteria indicative of potential fecal contamination(Escherichia coli,Enterococcus,fecal coliform bacteria)consistently and significantly increased in response to H_(2)O_(2),evidencing a form of‘pollution swapping’.H_(2)O_(2)more effectively reduced Cyanobacteria in enclosed mesocosms compared to whole-ecosystem *** whole-pond H_(2)O_(2)applications over a twoyear period temporarily reduced cyanobacterial levels but never reduced concentrations below bloom thresholds and populations always rebounded in two weeks or *** bacterial phyla of Cyanobacteria,Actinobacteria,and Planctomycetes were the most negatively impacted by H_(2)O_(2).Microcystis was always reduced by H_(2)O_(2),as was the toxin microcystin,but Microcystis remained dominant even after repeated H_(2)O_(2)*** H_(2)O_(2)favored the growth of eukaryotic algae over potentially harmful Cyanobacteria,the inability of H_(2)O_(2)to end cyanobacterial blooms in this eutrophic waterbody suggests it is a non-ideal mitigation approach in high biomass ecosystems and should be used judiciously due to potential negative impacts on non-target organisms and promotion of bacteria indicative of fecal contamination.

关键词： Indicator bacteria Toxic cyanobacteria Microcystin Microcystis Hydrogen peroxide Bacteria Enterococcus E.coli Pollution swapping

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Vitamin B_(12)-auxotrophy in dinoflagellates caused by incomplete or absent cobalamin-independent methionine synthase genes(metE)

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Fundamental Research 2022年第5期2卷 727-737页

作者： Siheng Lin Zhangxi Hu Xiaoying Song chris.opher jgobler Ying Zhong Tang CAS Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China School of Marine and Atmospheric Sciences Stony Brook UniversityNY11790USA Department of Biological Sciences and Biotechnology Minnan Normal UniversityZhangzhou 363000China

Dinoflagellates are responsible for most marine harmful algal blooms (HABs) and play vital roles in many ocean *** than 90% of dinoflagellates are vitamin B_(12) auxotrophs and that B_(12) availability can control dinoflagellate HABs,yet the genetic basis of B_(12) auxotrophy in dinoflagellates in the framework of the ecology of dinoflagellates and particularly HABs,which was the objective of this ***,we investigated the presence,phylogeny,and transcription of two methionine synthase genes(B_(12)-dependent metH and B_(12)-independent metE)via searching and assembling transcripts and genes from transcriptomic and genomic databases,cloning 38 cDNA isoforms of the two genes from 14 strains of dinoflagellates,measuring the expression at different scenarios of B_(12),and comprehensive phylogenetic analyses of more than 100 *** found that 1)metH was present in all 58 dinoflagellates accessible and metE was present in 40 of 58 species,2)all metE genes lacked N-terminal domains,3)metE of dinoflagellates were phylogenetically distinct from other known metE genes,and 4)expression of metH in dinoflagellates was responsive to exogenous B_(12) levels while expression of metE was not responding as that of genuine metE *** conclude that most,hypothetically all,dinoflagellates have either non-functional metE genes lacking N-terminal domain for most species,or do not possess metE for other species,which provides the genetic basis for the widespread nature of B_(12) auxotrophy in *** work elucidated a fundamental aspect of the nutritional ecology of dinoflagellates.

关键词： Harmful algal blooms(HABs)Dinoflagellates Vitamin B_(12) (cobalamin) Auxotrophy Methionine synthase genes Phytoplankton ecology

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Wastewater surveillance provides 10-days forecasting of COVID-19 hospitalizations superior to cases and test positivity:A prediction study

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Infectious Disease Modelling 2023年第4期8卷 1138-1150页

作者： Dustin T.Hill Mohammed A.Alazawi E.joe Moran Lydia j.Bennett Ian Bradley Mary B.Collins chris.opher j.gobler Hyatt Green Tabassum Z.Insaf Brittany Kmush Dana Neigel Shailla Raymond Mian Wang Yinyin Ye David A.Larsen Department of Public Health Syracuse UniversitySyracuseNY13244USA Center for Environmental Health New York State Department of HealthAlbanyNYUSA CDC Foundation AtlantaGAUSA Department of Civil Structural and Environmental EngineeringUniversity at BuffaloBuffaloNYUSA School of Marine and Atmospheric Sciences Sustainability Studies DivisionStony Brook UniversityStony BrookNYUSA Institute for Advanced Computational Science Stony Brook UniversityStony BrookNYUSA New York State Center for Clean Water Technology Stony Brook UniversityStony BrookNYUSA School of Marine and Atmospheric Sciences Stony Brook UniversityStony BrookNYUSA Department of Environmental Biology State University of New York College of Environmental Science and ForestrySyracuseNYUSA Department of Epidemiology and Biostatistics School of Public HealthUniversity at AlbanyRensselaerNYUSA Department of Civil Engineering College of Engineering and Applied SciencesStony Brook UniversityStony BrookNYUSA

Background:The public health response to COVID-19 has shifted to reducing deaths and hospitalizations to prevent overwhelming health *** amount of SARS-CoV-2 RNA fragments in wastewater are known to correlate with clinical data including cases and hospital admissions for *** developed and tested a predictive model for incident COVID-19 hospital admissions in New York State using wastewater ***:Using county-level COVID-19 hospital admissions and wastewater surveillance covering 13.8 million people across 56 counties,we fit a generalized linear mixed model predicting new hospital admissions from wastewater concentrations of SARS-CoV-2 RNA from April 29,2020 to june 30,*** included covariates such as COVID-19 vaccine coverage in the county,comorbidities,demographic variables,and holiday ***:Wastewater concentrations of SARS-CoV-2 RNA correlated with new hospital admissions per 100,000 up to ten days prior to *** that included wastewater had higher predictive power than models that included clinical cases only,increasing the accuracy of the model by 15%.Predicted hospital admissions correlated highly with observed admissions(r¼0.77)with an average difference of 0.013 hospitalizations per 100,000(95%CI¼[0.002,0.025])Interpretation:Using wastewater to predict future hospital admissions from COVID-19 is accurate and effective with superior results to using case data *** lead time of ten days could alert the public to take precautions and improve resource allocation for seasonal surges.

关键词： COVID-19 hospitalizations Wastewater-based epidemiology Forecasting Prediction SARS-CoV-2

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