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bloom algal

Alexis D Fischer, Michael L Brosnahan, Donald M Anderson
Many dinoflagellate cysts experience dormancy, a reversible state that prevents germination during unfavorable periods. Several of these species also cause harmful algal blooms (HABs), so a quantitative understanding of dormancy cycling is desired for better prediction and mitigation of bloom impacts. This study examines the effect of cold exposure on the duration of dormancy in Alexandrium catenella, a HAB dinoflagellate that causes paralytic shellfish poisoning (PSP). Mature, dormant cysts from Nauset Marsh (Cape Cod, MA USA) were stored at low but above freezing temperatures for up to six months...
June 18, 2018: Protist
Samuel Kofi Tulashie, Francis Kotoka, Foster Kwame Kholi, Samira Esinam Elsie Aggor-Woananu, Gifty Rhodalyn Tetteh
The need for simple, cheaper and high performance hospital effluent treatment system in Kete-Krachi District which is adjacent to the Lake Volta has necessitated this study. This study focuses on assessing, and treating Kete-Krachi District Hospital effluent using packed granular (GAC) and smooth activated carbon (SAC). The use of activated carbon is due to its less expensive method of operation, the ease to prepare from local raw materials, high availability, and effectiveness for treating hospital effluent...
July 2018: Heliyon
Qianqian Dong, Feng Wang, Yihua Xiao, Penghui Li, Qinghui Huang
Eutrophication enhances the production of autochthonous dissolved organic matter (DOM), which is a major driving factor behind the impairment of many aquatic ecosystems. In a mesocosm study, we investigated the effects of the abundance and composition of DOM on the potential bioavailability of cadmium (Cd) caused by eutrophication, using three-dimensional excitation-emission matrix fluorescence spectroscopy integrated with tangential flow ultrafiltration technology. The complexing capacity of DOM-Cd and the sorption distribution coefficient between DOM and the bulk solution was calculated based on a 1 : 1 complexation model...
August 9, 2018: Environmental Science. Processes & Impacts
Takahiro Segawa, Ryo Matsuzaki, Nozomu Takeuchi, Ayumi Akiyoshi, Francisco Navarro, Shin Sugiyama, Takahiro Yonezawa, Hiroshi Mori
Red-snow algae are red-pigmented unicellular algae that appear seasonally on the surface of thawing snow worldwide. Here, we analyse the distribution patterns of snow algae sampled from glaciers and snow patches in the Arctic and Antarctica based on nuclear ITS2 sequences, which evolve rapidly. The number of phylotypes is limited in both polar regions, and most are specific to either the Arctic or Antarctica. However, the bipolar phylotypes account for the largest share (37.3%) of all sequences, suggesting that red-algal blooms in polar regions may comprise mainly cosmopolitan phylotypes but also include endemic organisms, which are distributed either in the Arctic or Antarctica...
August 6, 2018: Nature Communications
Ke Chen, Joel Allen, Jingrang Lu
The community structures of phytoplankton are important factors and indicators of lake water quality. Harmful algal blooms severely impact water supply, recreational activities and wildlife habitat. This study aimed to examine the phytoplankton composition and variations using microscopy, and identify harmful Cyanobacteria in weekly samples taken from four sites at Harsha Lake in southwest Ohio. Over the course of the summer in 2015, the phytoplankton of Harsha Lake consisted mainly of 13 taxa belonging to Bacillariophyta, Chlorophyta, Cryptophyta, Cyanobacteria, Dinophyta and Euglenophyta...
October 31, 2017: Journal of Water Resource and Protection
Marc Long, Kévin Tallec, Philippe Soudant, Christophe Lambert, Fabienne Le Grand, Géraldine Sarthou, Dianne Jolley, Hélène Hégaret
Harmful microalgal blooms are a threat to aquatic organisms, ecosystems and human health. Toxic dinoflagellates of the genus Alexandrium are known to produce paralytic shellfish toxins and to release bioactive extracellular compounds (BECs) with potent cytotoxic, hemolytic, ichtyotoxic and allelopathic activity. Negative allelochemical interactions refer to the chemicals that are released by the genus Alexandrium and that induce adverse effects on the physiology of co-occurring protists and predators. Releasing BECs gives the donor a competitive advantage that may help to form dense toxic blooms of phytoplankton...
July 27, 2018: Environmental Pollution
Frank Unfried, Stefan Becker, Craig S Robb, Jan-Hendrik Hehemann, Stephanie Markert, Stefan E Heiden, Tjorven Hinzke, Dörte Becher, Greta Reintjes, Karen Krüger, Burak Avcı, Lennart Kappelmann, Richard L Hahnke, Tanja Fischer, Jens Harder, Hanno Teeling, Bernhard Fuchs, Tristan Barbeyron, Rudolf I Amann, Thomas Schweder
Polysaccharide degradation by heterotrophic microbes is a key process within Earth's carbon cycle. Here, we use environmental proteomics and metagenomics in combination with cultivation experiments and biochemical characterizations to investigate the molecular details of in situ polysaccharide degradation mechanisms during microalgal blooms. For this, we use laminarin as a model polysaccharide. Laminarin is a ubiquitous marine storage polymer of marine microalgae and is particularly abundant during phytoplankton blooms...
July 30, 2018: ISME Journal
Fuxing Zhang, Qian Ye, Qiuliang Chen, Ke Yang, Danyang Zhang, Zhangran Chen, Shasha Lu, Xueping Shao, Yongxiang Fan, Luming Yao, Lina Ke, Tianling Zheng, Hong Xu
Prorocentrum donghaiense blooms frequently occur in the Yangtze River Estuary and the adjacent East China Sea. These blooms have damaged marine ecosystems and caused enormous economic losses over the past two decades. Thus, highly efficient, low-cost, ecofriendly approaches must be developed to control P. donghaiense blooms. In this study, a bacterial strain (Y42) was identified as Paracoccus sp. and used to lyse P. donghaiense The supernatant of the Y42 culture was able to lyse P. donghaiense, and the algicidal activity of this Y42 supernatant was stable under different temperatures and durations of light exposure and over a wide pH range...
July 27, 2018: Applied and Environmental Microbiology
Shuaitao Wang, Nicolas Flipo, Thomas Romary
Dissolved oxygen within water column is a key variable to characterize the water quality. Water quality modeling has been extensively developed for decades. However, complex biogeochemical cycles are described using a high number of parameters. Hence, parameters' uncertainty constitutes a major problem in the application of these models. Sensitivity analysis allows the identification of the most influential parameters in a model and a better understanding of the governing processes. This paper presents a time-dependent sensitivity analysis for dissolved oxygen using Morris and Sobol methods combined with a functional principal components analysis for dimension reduction...
July 19, 2018: Water Research
Masato Yamamichi, Takehiro Kazama, Kotaro Tokita, Izumi Katano, Hideyuki Doi, Takehito Yoshida, Nelson G Hairston, Jotaro Urabe
Light is a fundamental driver of ecosystem dynamics, affecting the rate of photosynthesis and primary production. In spite of its importance, less is known about its community-scale effects on aquatic ecosystems compared with those of nutrient loading. Understanding light limitation is also important for ecosystem management, as human activities have been rapidly altering light availability to aquatic ecosystems. Here we show that decreasing light can paradoxically increase phytoplankton abundance in shallow lakes...
July 4, 2018: Proceedings. Biological Sciences
Adam Michael Lewis, Lewis Nicholas Coates, Andrew D Turner, Linda Percy, Jane Lewis
Alexandrium minutum is a globally distributed harmful algal bloom species with many strains that are known to produce paralytic shellfish toxins (PSTs) and consequently represent a concern to human and ecosystem health. This review highlights that A. minutum typically occurs in sheltered locations, with cell growth occurring during periods of stable water conditions. Sediment characteristics are important in the persistence of this species within a location, with fine sediments providing cyst deposits for ongoing inoculation to the water column...
July 26, 2018: Journal of Phycology
M Pesce, A Critto, S Torresan, E Giubilato, M Santini, A Zirino, W Ouyang, A Marcomini
There is high confidence that the anthropogenic increase of atmospheric greenhouse gases (GHGs) is causing modifications in the Earth's climate. Coastal waterbodies such as estuaries, bays and lagoons are among those most affected by the ongoing changes in climate. Being located at the land-sea interface, such waterbodies are subjected to the combined changes in the physical-chemical processes of atmosphere, upstream land and coastal waters. Particularly, climate change is expected to alter phytoplankton communities by changing their environmental drivers (especially climate-related), thus exacerbating the symptoms of eutrophication events, such as hypoxia, harmful algal blooms (HAB) and loss of habitat...
July 1, 2018: Science of the Total Environment
Karold Viviana Coronado-Franco, John Josephraj Selvaraj, José Ernesto Mancera Pineda
The current capacity in the Caribbean region to enhance the knowledge about algal blooms and harmful algal blooms has several logistical constraints. This work aimed to explore the detection of possible algal blooms using Moderate Resolution Imaging Spectroradiometer (MODIS) Fluorescence Line Height (FLH) data in the Colombian Caribbean Sea between 2003 and 2013. Monthly FLH images with 4 km of spatial resolution were processed and classified. The relationship between the Sea Surface Temperature (SST) and the FLH were explored using a Geographically Weighted Regression...
August 2018: Marine Pollution Bulletin
Lunhui Lu, Linlin Xu, Jixiang Yang, Zhe Li, Jinsong Guo, Yan Xiao, Juanjuan Yao
This study investigated phytoplankton and bacterioplankton communities by flow cytometer in a tributary backwater area of the Three Gorges Reservoir, China. Samplings were conducted in two cyanobacterial bloom periods (May and August) and no algal-blooms period (November) of 2014, representing three different operational stages of the reservoir, i.e., reservoir discharge period, fluctuating period in the summer flood season, and high water level in the impoundment period. Phyto- and bacterioplankton exhibit a wide range of variability along the depth profiles of the water column...
July 23, 2018: Environmental Science and Pollution Research International
Aseem R Rath, Smita Mitbavkar, Arga Chandrashekar Anil
Seasonal and spatial phytoplankton distribution in relation to environmental factors was investigated in New Mangalore Port, a major port along the west coast of India. A well-mixed water column characterized the non-monsoon seasons, whereas it was weakly stratified during monsoon. Water quality index (TRIX) scores indicated good water quality except during pre-monsoon (inner zone surface) and monsoon (near bottom waters). Surface abundance of tychopelagic diatoms (Paralia sulcata, Melosira nummuloides, Cylindrotheca closterium, and Nitzschia sigma) was higher during non-monsoon seasons...
July 23, 2018: Environmental Monitoring and Assessment
Huihui Fu, Peng Jiang, Jin Zhao, Chunhui Wu
Algae-bacteria associations occurred widely in marine habitats, however, contributions of bacteria to macroalgal blooming were almost unknown. In this study, a potential endophytic strain SI-3 was isolated from Ulva prolifera , the causative species for the world's largest green tide in the Yellow Sea, following a strict bleaching treatment to eliminate epiphytes. The genomic sequence of SI-3 was determined in size of 4.8 Mb and SI-3 was found to be mostly closed to Pseudomonas stutzeri . To evaluate the characteristics of SI-3 as a potential endophyte, the genomes of SI-3 and other 20 P...
2018: Frontiers in Microbiology
Manasvi Lingam, Abraham Loeb
As evident from the nearby examples of Proxima Centauri and TRAPPIST-1, Earth-sized planets in the habitable zone of low-mass stars are common. Here, we focus on such planetary systems and argue that their (oceanic) tides could be more prominent due to stronger tidal forces. We identify the conditions under which tides may exert a significant positive influence on biotic processes including abiogenesis, biological rhythms, nutrient upwelling, and stimulating photosynthesis. We conclude our analysis with the identification of large-scale algal blooms as potential temporal biosignatures in reflectance light curves that can arise indirectly as a consequence of strong tidal forces...
July 2018: Astrobiology
Huajun Zhang, Kai Wang, Lixin Shen, Heping Chen, Fanrong Hou, Xiaoyan Zhou, Demin Zhang, Xiangyu Zhu
Harmful algal blooms (HABs) are serious ecological disasters in coastal areas, significantly influencing biogeochemical cycles driven by bacteria. The shifts in microbial communities during HABs have been widely investigated, yet the assembly mechanism of microbial communities during HABs is poorly understood. Here using 16S rRNA gene amplicon sequencing, we analyzed the microbial communities during an early spring diatom bloom, in order to investigate the dynamics of microbial assembly process. Rhodobacteraceae , Flavobacteriaceae, and Microbacteriaceae were the main bacterial families during the bloom...
July 13, 2018: Applied and Environmental Microbiology
Rodrigo M Montes, Ximena Rojas, Paulina Artacho, Alfredo Tello, Renato A Quiñones
Harmful algal blooms (HABs) have affected salmon farms in Chile since the early 1970's, causing massive losses in fish. Two large HABs occurred in 2002 and 2009, during which Alexandrium catenella blooms killed tons of salmon over an extended geographic area in southern Chile. At the beginning of 2016, high and persistent densities of Pseudochattonella cf. verruculosa and A. catenella were detected in the estuarine and marine ecosystems of southern Chile. Mortality for this latter event reached 27 million salmon and trout (i...
July 2018: Harmful Algae
Houshuo Jiang, David M Kulis, Michael L Brosnahan, Donald M Anderson
Predator-prey interactions of planktonic protists are fundamental to plankton dynamics and include prey selection, detection, and capture as well as predator detection and avoidance. Propulsive, morphology-specific behaviors modulate these interactions and therefore bloom dynamics. Here, interactions between the mixotrophic, harmful algal bloom (HAB) dinoflagellate Dinophysis acuminata and its ciliate prey Mesodinium rubrum were investigated through quantitative microvideography using a high-speed microscale imaging system (HSMIS)...
July 2018: Harmful Algae
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