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https://read.qxmd.com/read/30776220/phenology-of-phytoplankton-blooms-in-a-trophic-lake-observed-from-long-term-modis-data
#1
Kun Shi, Yunlin Zhang, Yibo Zhang, Na Li, Boqiang Qin, Guangwei Zhu, Yongqiang Zhou
Phytoplankton phenology critically affects elements biogeochemical cycles, ecosystem structure, and productivity. However, our understanding about the phenological process and driving mechanism is still very limited due to the shortage of long-term observation data. We used all available daily MODIS-Aqua data from 2003 to 2017 to determine bloom start dates (BSDs) in a typical trophic lake (Lake Taihu) and investigate how phytoplankton BSDs respond to climate change and environmental factors. The results indicate that BSDs have advanced 29...
February 18, 2019: Environmental Science & Technology
https://read.qxmd.com/read/30772567/unmasking-the-identity-of-toxigenic-cyanobacteria-driving-a-multi-toxin-bloom-by-high-throughput-sequencing-of-cyanotoxins-genes-and-16s-rrna-metabarcoding
#2
María Cristina Casero, David Velázquez, Miguel Medina-Cobo, Antonio Quesada, Samuel Cirés
Cyanobacterial harmful algal blooms (CyanoHABs) are complex communities that include coexisting toxic and non-toxic strains only distinguishable by genetic methods. This study shows a water-management oriented use of next generation sequencing (NGS) to specifically pinpoint toxigenic cyanobacteria within a bloom simultaneously containing three of the most widespread cyanotoxins (the hepatotoxins microcystins, MCs; and the neurotoxins anatoxin-a, ATX, and saxitoxins, STXs). The 2013 summer bloom in Rosarito reservoir (Spain) comprised 33 cyanobacterial OTUs based on 16S rRNA metabarcoding, 7 of which accounted for as much as 96...
February 6, 2019: Science of the Total Environment
https://read.qxmd.com/read/30772551/quantitative-assessment-of-the-effects-of-human-activities-on-phytoplankton-communities-in-lakes-and-reservoirs
#3
C S Zhao, N F Shao, S T Yang, H Ren, Y R Ge, Z S Zhang, P Feng, W L Liu
Global algal blooms have been severely threatening safety of drinking water and development of socio-economy. Effective prevention and accurate control of algal blooms require a quantitative assessment of the influence of human activities and identification of priority areas. However, previous studies on the quantitative assessment of the effects of human activities on algal communities are lacking, severely hindering the effective and precise control of algal blooms. This paper proposes a quantitative assessment model to evaluate the impact intensity of human activities on phytoplankton...
February 8, 2019: Science of the Total Environment
https://read.qxmd.com/read/30763858/application-of-mass-balance-modelling-to-assess-the-effects-of-ecological-restoration-on-energy-flows-in-a-subtropical-reservoir-china
#4
Sai Wang, Lin Wang, Yu Zheng, Zhong-Bing Chen, Yang Yang, Hsing-Juh Lin, Xiao-Qin Yang, Tuan-Tuan Wang
Eutrophication is a leading cause of impairment of lentic water bodies throughout the world. To inhibit algal blooms and remove excess nutrients, a 10,000 m2 restoration project consisting of vegetation establishment and fish manipulation was conducted in the eutrophic bay of the Yantian Reservoir, southern China. Three Ecopath models were constructed to assess the recovery effects at an ecosystem level, and time series data were simulated to propose a fishery policy. During the restoration, 1) the redundant primary production flowing back to detritus decreased due to the increased predation of four stocked fish with different feeding habits; 2) the transfer efficiencies (TEs) through trophic levels increased due to the reinforced energy flows along the planktivorous, herbivorous, and molluscivorous food chains; 3) the groups that had the highest keystoneness shifted from carnivorous fish to invertivorous fish and omnivorous shrimp, indicating the shift of mixed trophic impacts from top-down to wasp-waist control; and 4) the changing indices of path length, flow fluxes, matter cycling, and network information showed that the restored system was more mature, developed, and organized than before...
January 28, 2019: Science of the Total Environment
https://read.qxmd.com/read/30763352/sediment-potentially-controls-in-lake-phosphorus-cycling-and-harmful-cyanobacteria-in-shallow-eutrophic-utah-lake
#5
Matthew C Randall, Gregory T Carling, Dylan B Dastrup, Theron Miller, Stephen T Nelson, Kevin A Rey, Neil C Hansen, Barry R Bickmore, Zachary T Aanderud
Lakes worldwide are impacted by eutrophication and harmful algal or cyanobacteria blooms (HABs) due to excessive nutrients, including legacy P released from sediments in shallow lakes. Utah Lake (northern Utah, USA) is a shallow lake with urban development primarily on the east side of the watershed, providing an opportunity to evaluate HABs in relation to a gradient of legacy sediment P. In this study, we investigated sediment composition and P concentrations in sediment, pore water, and the water column in relation to blooms of harmful cyanobacteria species...
2019: PloS One
https://read.qxmd.com/read/30758193/the-impact-of-natural-variation-of-oh-radical-demand-of-drinking-water-sources-on-the-optimum-operation-of-the-uv-h2o2-process
#6
Minhwan Kwon, Seonbaek Kim, Youmi Jung, Tae-Mun Hwang, Mihaela Stefan, Joon-Wun Kang
Hydroxyl radical (•OH) water demand is a key parameter which impacts the design and operation of UV/H2O2 process in water remediation projects. Long-term monitoring of the •OH water demand in water sources used for drinking water production indicated significant seasonal variations of this parameter (1.59×10<sup>4 to 4.98×10<sup>4 s-1), which coincided with the occurrence of algal blooming events. Pilot-scale tests at a drinking water treatment plant confirmed that the UV/H2O2 process performance for contaminant removal is predictable when the •OH water demand is accurately determined through a validated experimental method...
February 13, 2019: Environmental Science & Technology
https://read.qxmd.com/read/30743964/coupled-effects-of-land-use-pattern-and-hydrological-regime-on-composition-and-diversity-of-riverine-eukaryotic-community-in-a-coastal-watershed-of-southeast-china
#7
Yaling Huang, Jinliang Huang
The coupled effects of land use pattern and hydrological regime on composition and diversity of riverine eukaryotic community are needed for understanding riverine ecosystem health and algal blooming mechanism. In-situ monitoring and 18S rRNA gene sequencing were used to investigate spatiotemporal variations of eukaryotic community in three types of watershed with different dominant land use type (i.e. urban, forest, and natural) during three seasons (i.e. dry, transition, and wet seasons) in a coastal watershed of Southeast China...
April 10, 2019: Science of the Total Environment
https://read.qxmd.com/read/30739812/accumulation-and-biotransformation-dynamics-of-the-neurotoxic-complex-saxitoxin-in-different-life-stages-of-ostrea-chilensis
#8
Alejandro Ortiz, Jorge M Navarro, Gemita Pizarro, Paola A Villanueva, Cristian J Segura
The neurotoxic complex saxitoxin, is a group of marine toxins that historically has significantly impacted human health and the ability to utilize marine resources. A steady increase in the distribution and intensity of Alexandrium catenella blooms in Chile, and around the world, has caused major ecological and socioeconomic impacts, putting this type of dinoflagellate, and its toxicity, in the spotlight. Ostrea chilensis is a commercially and ecologically important resource harvested from wild populations and farmed in centers of southern Chile, where it is exposed to large harmful algal blooms of the type that can cause paralysis in humans...
February 4, 2019: Marine Environmental Research
https://read.qxmd.com/read/30738269/hydrogeological-modelling-for-the-watershed-management-of-the-mar-menor-coastal-lagoon-spain
#9
Andrés Alcolea, Sergio Contreras, Johannes E Hunink, José Luis García-Aróstegui, Joaquín Jiménez-Martínez
The Mar Menor is the largest lagoon along the Spanish Mediterranean coast. It suffers from eutrophication and algal blooms associated with intensive agricultural activities and urban pressure in the surrounding Campo de Cartagena plain. A balanced discharge of groundwater, carrier of algal nutrients such as nitrate, is essential to ensure the integrity of the coastal lagoon and the availability of groundwater resources inland. We here present a 3D hydrogeological model of the unconfined Quaternary aquifer that discharges into the lagoon...
January 29, 2019: Science of the Total Environment
https://read.qxmd.com/read/30737345/the-algicidal-bacterium-kordia-algicida-shapes-a-natural-plankton-community
#10
Arite Bigalke, Nils Meyer, Lydia Papanikolopoulou, Karen Helen Wiltshire, Georg Pohnert
Plankton communities consist of complex microbial consortia which change over time with. These fluctuations can only be partially explained by limiting resources. Biotic factors such as herbivores and pathogens also contribute to the control of algal blooms. Here we address the effect of algicidal bacteria on a natural plankton community in an indoor enclosure experiment. The algicidal bacteria, introduced into plankton taken directly from the North Sea during a diatom bloom, caused the rapid decline of the bloom forming Chaetoceros socialis within only one day...
February 8, 2019: Applied and Environmental Microbiology
https://read.qxmd.com/read/30734515/optimized-culturing-conditions-for-an-algicidal-bacterium-pseudoalteromonas-sp-sp48-on-harmful-algal-blooms-caused-by-alexandrium-tamarense
#11
Yi-Hua Lyu, Yue-Xia Zhou, Yi Li, Jin Zhou, Yi-Xiao Xu
Bacteria play an important role in preventing algal blooms and reducing their harm to the environment. To improve the algicidal activity of Pseudoalteromonas SP48 which had an inhibition effect on dinoflagellate Alexandrium tamarense, its growth medium and fermentation conditions were optimized for this bacterium. In this study, we used two steps to establish the optimum conditions. First, the proper proportion of medium was selected based on an orthogonal design. Then, the fermentation conditions were further optimized through uniform design in an enlarged 5L bioreactor...
February 7, 2019: MicrobiologyOpen
https://read.qxmd.com/read/30714277/nutrient-limitation-and-enzymolysis-of-phosphorus-in-meiliang-bay-lake-taihu-during-algal-blooms
#12
Mengqi Jiang, Xiyan Ji, Yanping Zhou, Weizhen Zhang, Chengjin Zhang, Jibiao Zhang, Zheng Zheng
In this study, algal growth potential tests were performed in water samples collected from six sampling sites in Meiliang Bay, Lake Taihu. The potential release of soluble reactive phosphorus (SRP) by enzymatic hydrolysis of enzymatically hydrolyzable phosphorus (EHP) was simultaneously evaluated. Results show that all studied regions were in highly eutrophic states, with additional nitrogen (N) or phosphorus (P) inputs, inducing negligible further increase in algal growth. EHP in water could be rapidly transformed into SRP, further supporting the proliferation of algal blooms...
October 26, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://read.qxmd.com/read/30711794/long-term-variation-of-phytoplankton-biomass-and-physiology-in-taihu-lake-as-observed-via-modis-satellite
#13
Changchun Huang, Yunlin Zhang, Tao Huang, Hao Yang, Yunmei Li, Zhigang Zhang, Mengying He, Zhujun Hu, Ting Song, A-Xing Zhu
Estimation of phytoplankton biomass (noted as phytoplankton carbon, Cphyto ) and evaluation of phytoplankton physiology is central to the estimation of primary productivity and the carbon cycle. This issue has been widely considered in oceans but not in inland water. Here, we develop experiential and semi-analytical models, which validated by independent in situ measurement data, respectively, to derive Cphyto and phytoplankton absorption coefficient at 675 nm (aph (675)) from MODIS. The effects of nutrients and temperature on the seasonal variation of phytoplankton physiology were assessed through a novel proxy of Cphyto to aph (675) ratio (Cphyto /aph (675)) over the Lake Taihu, the third largest lake in China...
January 25, 2019: Water Research
https://read.qxmd.com/read/30711311/design-synthesis-and-algicides-activities-of-thiourea-derivatives-as-the-novel-scaffold-aldolase-inhibitors
#14
Shan Xiao, Lin Wei, Zongqin Hong, Li Rao, Yanliang Ren, Jian Wan, Lingling Feng
By using a new Fragment-Based Virtual Screen strategy, two series of novel FBA-II inhibitors (thiourea derivatives) were de novo discovered based on the active site of fructose-1, 6-bisphosphate aldolase from Cyanobacterial (CyFBA). In comparison, most of the N-(2-benzoylhydrazine-1-carbonothioyl) benzamide derivatives (L14∼L22) exhibit higher CyFBA-II inhibitory activities compared to N-(phenylcarbamothioyl) benzamide derivatives (L1∼L13). Especially, compound L14 not only shows higher CyFBA-II activity (Ki  = 0...
January 24, 2019: Bioorganic & Medicinal Chemistry
https://read.qxmd.com/read/30710776/phenol-and-cr-vi-removal-using-materials-derived-from-harmful-algal-bloom-biomass-characterization-and-performance-assessment-for-a-biosorbent-a-porous-carbon-and-fe-c-composites
#15
Yanbin Cui, Arvid Masud, Nirupam Aich, John D Atkinson
Lake Erie experiences annual harmful algal blooms (HAB), but generated HAB biomass may provide a waste-based precursor for environmental remediation materials. Three classes of materials (i.e., algal powder biosorbent, porous carbon, and iron/carbon (Fe/C) composite) are prepared from HAB biomass. Algal powder is nonporous with diverse functional groups. Porous carbon, prepared via one-pot carbonization and activation, has surface area up to 430 m2 /g. Fe/Cs are prepared by cultivating HAB biomass in iron-rich media, followed by one-pot pyrolysis...
January 23, 2019: Journal of Hazardous Materials
https://read.qxmd.com/read/30703731/attack-of-microcystis-aeruginosa-bloom-on-a-ceratophyllum-submersum-field-ecotoxicological-measurements-in-real-environment-with-real-microcystin-exposure
#16
Andrea Zsuzsanna Ujvárosi, Milán Riba, Tamás Garda, Gyöngyi Gyémánt, György Vereb, Márta M-Hamvas, Gábor Vasas, Csaba Máthé
Overproduction of toxic cyanobacteria is a type of harmful algal blooms (HABs). The heptapeptide microcystins (MCs) are one of the most common cyanotoxins. There is increasing research concerning the effects of MCs on growth and physiology of vascular plants, however there is a lack of studies on their direct effects on aquatic macrophytes in the real environment. Here we report the occurrence of a MC producing HAB in Lake Bárdos, Hungary in 2012 with harmful effects on cytological, histological and biochemical parameters of Ceratophyllum submersum (soft hornwort) plants naturally growing at the blooming site...
January 22, 2019: Science of the Total Environment
https://read.qxmd.com/read/30703645/natural-organic-matter-removal-from-algal-rich-water-and-disinfection-by-products-formation-potential-reduction-by-powdered-activated-carbon-adsorption
#17
Keun-Young Park, Young-Jae Yu, Soon-Jin Yun, Ji-Hyang Kweon
Algal blooms intensified operational problems in water treatment due to the increases of taste- and odor-causing compounds and natural organic matter (NOM). Effects of powdered activated carbon (PAC) addition during algal blooms on NOM removal was investigated in this study using an algal-rich water. Water quality analyses including dissolved organic carbon (DOC), ultraviolet absorbance at 254 nm (UV254 ) and specific UV absorbance (SUVA) were performed to elucidate characteristics of NOM removal by PAC adsorption...
January 28, 2019: Journal of Environmental Management
https://read.qxmd.com/read/30701234/draft-genome-sequence-of-picocystis-sp-strain-ml-cultivated-from-mono-lake-california
#18
Emily N Junkins, Blake W Stamps, Frank A Corsetti, Ronald S Oremland, John R Spear, Bradley S Stevenson
The microscopic alga Picocystis sp. strain ML is responsible for recurrent algal blooms in Mono Lake, CA. This organism was characterized by only very little molecular data, despite its prominence as a primary producer in saline environments. Here, we report the draft genome sequence for Picocystis sp. strain ML based on long-read sequencing.
January 2019: Microbiology resource announcements
https://read.qxmd.com/read/30699162/historical-observations-of-algal-blooms-in-mazatlan-bay-sinaloa-mexico-1979-2014
#19
Roberto Cortés-Altamirano, Rosalba Alonso-Rodríguez, David Alberto Salas-de-León
A 35-year record of algal blooms in Mazatlan Bay is reviewed in order to register bloom-forming species and their seasonal presence, duration, degree of toxicity and environmental impact. A total of 202 algal blooms have been recorded and 25 dominant species identified: 6 toxic, 5 harmful and 14 harmless species. A harmless species, Myrionecta rubra, tended to decrease in frequency, while toxic species Gymnodinium catenatum and Margalefidinium polykrikoides showed a clear trend towards an increase in frequency...
2019: PloS One
https://read.qxmd.com/read/30688632/a-review-of-allelopathy-on-microalgae
#20
Kaiting Tan, Ziqi Huang, Ruibo Ji, Yongting Qiu, Zhihong Wang, Junxia Liu
Algal blooms have severe impacts on the utilization of water resources. The discovery of allelopathy provides a new dimension to solving this problem due to its high efficiency, safety and economy. Allelopathy can suppress the growth of microalgae by impairing the structure, photosynthesis and enzyme activity of algal cells. In the current work, we first demonstrate the allelopathy and allelochemicals derived from both plants and algae. We then expound the potential mechanisms of allelopathy on microalgae. Next, the potential application of allelochemicals in water environment is proposed...
January 28, 2019: Microbiology
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