Read by QxMD icon Read

harmful algal blooms

C L Nieman, S M Gray
The objectives of this study were to determine the effects of different forms of elevated turbidity on the visual acuity of two native Lake Erie fishes and to assess the response of fishes from different trophic levels to elevated turbidity. Additionally, the role of visual morphology (e.g., eye and optic lobe size) on visual acuity was evaluated across visual environments. Reaction distance, a behavioural proxy for measures of visual acuity, was measured for a top predator, walleye Sander vitreus and a forage fish, emerald shiner Notropis atherinoides...
December 3, 2018: Journal of Fish Biology
Huichao Jiang, Dongyan Liu, Xiukai Song, Yuanqing Ma, Yujue Wang, Aiying Liu, Ling Cheng, Jianlong He, Shan Sun
The response of phytoplankton assemblages to decreases in nitrogen loading is an essential index to assess the recovery of aquatic ecosystems from eutrophic status. However, a positive signal is hard to observe from short-term operations considering ecosystem complexity. Here, we used decadal data from the Laizhou Bay, China to track the seasonal and annual variations in phytoplankton assemblages after ammonia reduction in the Xiaoqing and Yellow Rivers. Annual trends show reduced phytoplankton abundance and a decline in harmful algal blooms, indicating the positive recovery of phytoplankton assemblages...
November 2018: Marine Pollution Bulletin
Xinguo Shi, Lemian Liu, Yue Li, Yuchun Xiao, Guangmao Ding, Senjie Lin, Jianfeng Chen
The relationship between algicidal bacteria and harmful-algal-bloom-forming dinoflagellates is understudied and their action modes are largely uncharacterized. In this study, an algicidal bacterium (FDHY-03) was isolated from a bloom of Prorocentrum donghaiense and the characteristics of its action against P. donghaiense was investigated at physiological, molecular, biochemical and cytological levels. 16S rDNA sequence analysis placed this strain in the genus of Alteromonas in the subclass of γ-proteobacteria...
December 2018: Harmful Algae
Jorge I Mardones, Lana Shabala, Sergey Shabala, Juan José Dorantes-Aranda, Andreas Seger, Gustaaf M Hallegraeff
Harmful algal blooms (HAB) are responsible for massive mortalities of wild and aquacultured fish due to noticeable gill damage, but the precise fish-killing mechanisms remain poorly understood. A non-invasive microelectrode ion flux estimation (MIFE) technique was successfully applied to assess changes in membrane-transport processes in a model fish gill cell line exposed to harmful microplankton. Net Ca2+ , H+ , K+ ion fluxes in the rainbow trout cell line RTgill-W1 were monitored before and after addition of lysed cells of this Paralytic Shellfish Toxins (PST) producer along with purified endocellular dinoflagellate PST...
December 2018: Harmful Algae
Jerilyn Ritzman, Amy Brodbeck, Sara Brostrom, Scott McGrew, Stacia Dreyer, Terrie Klinger, Stephanie K Moore
In the spring of 2015, a massive harmful algal bloom (HAB) of the toxin-producing diatom Pseudo-nitzschia occurred on the U.S. West Coast, resulting in the largest recorded outbreak of the toxin domoic acid and causing fisheries closures. Closures extended into 2016 and generated an economic shock for coastal fishing communities. This study examines the economic and sociocultural impacts of the Dungeness crab and razor clam fisheries closures on two fishing-dependent communities. Semi-structured interviews were conducted with 36 community members from two communities impacted by the event - Crescent City, California and Long Beach, Washington...
December 2018: Harmful Algae
Brittanie L Dabney, Reynaldo Patiño
Glyphosate-based herbicides (GBH) are widely used around the globe. While generally toxic to phototrophs, organic phosphorus in glyphosate can become available to glyphosate-resistant phytoplankton and contribute to algal bloom development. Few studies have examined the effects of GBH on growth of eukaryotic microalgae and information for the toxic bloom-forming haptophyte, Prymnesium parvum, is limited. Using a batch-culture system, this study examined the effects on P. parvum growth of a single application of Roundup Weed and Grass Killer Super Concentrate Plus® (Roundup SC), Roundup Weed and Grass Killer Ready-to-Use III® (Roundup RtU), and technical-grade glyphosate at low concentrations [0-1000 μg glyphosate acid equivalent (ae) l-1 ]...
December 2018: Harmful Algae
Chunyun Zhang, Guofu Chen, Yuanyuan Wang, Rui Sun, Xiaoli Nie, Jin Zhou
Harmful algal blooms (HAB) involving toxic microalgae have posed a serious threat to the marine industry and environment in the past several decades. Efficient techniques are required to monitor the marine environment to provide an effective warning of imminent HAB. Sequenced the partial large subunit rDNA (D1-D2) sequences of eight toxic harmful algae that are commonly distributed along the Chinese coast were cloned. Specific padlock probes (PLP) that contain linker regions composed of universal primer binding sites and Zip sequences were designed from the obtained target DNA...
December 2018: Harmful Algae
Aletta T Yñiguez, Jennifer Maister, Cesar L Villanoy, Josephine Dianne Deauna, Eileen Peñaflor, Aldwin Almo, Laura T David, Garry A Benico, Ellen Hibay, Irmi Mora, Sandra Arcamo, Jun Relox, Rhodora V Azanza
In contrast to temperate Harmful Algal Blooms (HABs), knowledge on the mechanisms driving tropical HABs are less well studied. The interaction of a seasonal temperature window, cysts (for certain species) and large-scale transport are some of the key processes in temperate HABs. In the Philippines, HABs occur not along long open coastlines, but in embayments that are highly influenced by run-off and stratification. These embayments are typically also the sites of cultured or wild harvest shellfish and other aquaculture activities...
December 2018: Harmful Algae
Julia M Diaz, Sydney Plummer, Carmelo Tomas, Catharina Alves-de-Souza
Harmful bloom-forming algae include some of the most prolific microbial producers of extracellular reactive oxygen species (ROS). However, the taxonomic diversity of ROS production, the underlying physiological mechanisms and ecophysiological roles of ROS cycling are not completely characterized among phytoplankton taxa that form harmful algal blooms (HABs). This study examines the extracellular production of the ROS superoxide and hydrogen peroxide by five marine HAB species: Chattonella marina , Heterosigma akashiwo , Karenia brevis , Pseudo-nitzschia sp...
November 2018: Journal of Plankton Research
Qilong Wang, Yuanli Liu, Jingsong Guo, Song Lin, Yeqi Wang, Tieying Yin, Hans Gregersen, Tingzhang Hu, Guixue Wang
The harmful algal blooms are becoming increasingly problematic in the regions that drinking water production depends on surface waters. With a global occurrence, microcystins are toxic peptides produced by multiple cyanobacterial genera in the harmful algal blooms. In this study, we examined the effects of microcystin-LR (MC-LR), a representative toxin of the microcystin family, on vascular development in zebrafish and the apoptosis of human umbilical vein endothelial cells (HUVECs). In zebrafish larvae, MC-LR induced angiodysplasia, damaged vascular structures and reduced lumen size at 0...
November 17, 2018: Chemosphere
Melinda Hersey, Shane N Berger, Jordan Holmes, Alyssa West, Parastoo Hashemi
Our understanding of the world around us has been greatly enhanced by our ability to detect and quantify analytes in the environment and in biology. It is highly beneficial to perform analysis at the site of interest as many situations do not afford the luxury of time required for samples to be collected and sent off for analysis. Some processes necessitate immediate detection to facilitate rapid action. As an example, harmful environmental phenomena can result from dynamic events such as the recent spate of tropical cyclones in the Caribbean and Southeastern region of the United States...
November 27, 2018: Analytical Chemistry
Alex Alcántara-Rubira, Víctor Bárcena-Martínez, Maribel Reyes-Paulino, Katherine Medina-Acaro, Lilibeth Valiente-Terrones, Angélica Rodríguez-Velásquez, Rolando Estrada-Jiménez, Omar Flores-Salmón
Causative species of Harmful Algal Bloom (HAB) and toxins in commercially exploited molluscan shellfish species are monitored weekly from four classified shellfish production areas in Perú (three in the north and one in the south). Okadaic acid (OA) and pectenotoxins (PTXs) were detected in hand-picked cells of Dinophysis ( D. acuminata -complex and D. caudata ) and in scallops ( Argopecten purpuratus ), the most important commercial bivalve species in Perú. LC-MS analyses revealed two different toxin profiles associated with species of the D...
November 23, 2018: Toxins
Hainan Ai, Yixi Qiu, Qiang He, Yixin He, Chun Yang, Li Kang, Huarui Luo, Wei Li, Yufeng Mao, Meijuan Hu, Hong Li
Carbon sources are a critical requirement for the proliferation of algae and the occurrence of harmful algal blooms (HABs), but are often turned into methane (CH4 ) after the collapse of severe HABs. Here, we attempt to remove HABs, reduce algal-derived CH4 emissions, and repair the broken carbon biogeochemical cycle in aquatic systems using an integrated ecological approach including flocculation, capping, and submerged macrophyte induction, preliminary at a microcosm scale. This strategy sustainably reached 98% algal removal after 65 days of incubation and resulted in an aerobic microenvironment (ORP = +12 mv) at the sediment-water interface...
November 19, 2018: Science of the Total Environment
Soryong Chae, Tahereh Noeiaghaei, Yoontaek Oh, In S Kim, Jin-Soo Park
Harmful algal blooms are occurring more frequently in fresh water throughout the world. Certain cyanobacteria can produce and release potent toxic compounds, known as cyanotoxins, such as microcystins, cylindrospermopsin, saxitoxin, and anatoxin-a, and as such they have become a human and environmental health concern. Hybrid photocatalytic composites (HPCs) comprising carbon nanotubes on the surface of TiO2 nanotubes were designed in this study. The HPCs have a selective adsorption capacity to cyanotoxins and provide photocatalytic activity to produce reactive oxygen species for the degradation of cyanotoxins...
November 13, 2018: Water Research
Danyang Zhang, Qian Ye, Fuxing Zhang, Xueping Shao, Yongxiang Fan, Xiaoying Zhu, Yinan Li, Luming Yao, Yun Tian, Tianling Zheng, Hong Xu
Microcystis aeruginosa can cause harmful algal blooms in freshwaters worldwide. It has already seriously affected human lives and prevented the use of water resources. Therefore, there is an urgent need to develop ecofriendly and effective methods to control and eliminate M. aeruginosa in aquatic environments. In this study, Halobacillus sp. strain H9, a bacterium that showed high M. aeruginosa flocculation activity, was isolated and selected to assess its potential for the removal of M. aeruginosa. The analyses of flocculation activity and mode indicated that the strain H9 induced M...
November 15, 2018: Chemosphere
Yanping Zhou, Xufeng Zhang, Xuan Li, Peili Jia, Ruihua Dai
The freshwater cyanobacteria, Microcystis aeruginosa (M. aeruginosa), is well known to produce microcystins (MCs) and induce the formation of harmful algal blooms (HABs) in aquatic environments, but the effects that urea fertilizer has on cyanobacterial growth and toxin production from a molecular biology perspective remain poorly understood. We evaluated changes in the growth and toxicity of M. aeruginosa cultured under different conditions of nitrogen (N) starvation (NN), low nitrogen (LN), and high nitrogen (HN)...
November 8, 2018: Science of the Total Environment
Cuizhu Sun, Ge Zhang, Hao Zheng, Ning Liu, Mei Shi, Xianxiang Luo, Lingyun Chen, Fengmin Li, Shugang Hu
Phthalate esters (PAEs), one class of the most frequently detected endocrine-disrupting chemicals (EDCs) in marine environment, have aroused wide public concerns because of their carcinogenicity, teratogenicity, and mutagenicity. However, the environmental fate of PAEs in the occurrence of harmful algal blooms remains unclear. In this research, four PAEs with different alkyl chains, i.e., dimethyl phthalate (DMP), diethyl phthalate (DEP), diallyl phthalate (DAP), and dipropyl phtalate (DPrP) were selected as models to investigate toxicity, uptake, and degradation of PAEs in seawater grown with K...
November 12, 2018: Aquatic Toxicology
Andrea J Reid, Andrew K Carlson, Irena F Creed, Erika J Eliason, Peter A Gell, Pieter T J Johnson, Karen A Kidd, Tyson J MacCormack, Julian D Olden, Steve J Ormerod, John P Smol, William W Taylor, Klement Tockner, Jesse C Vermaire, David Dudgeon, Steven J Cooke
In the 12 years since Dudgeon et al. (2006) reviewed major pressures on freshwater ecosystems, the biodiversity crisis in the world's lakes, reservoirs, rivers, streams and wetlands has deepened. While lakes, reservoirs and rivers cover only 2.3% of the Earth's surface, these ecosystems host at least 9.5% of the Earth's described animal species. Furthermore, using the World Wide Fund for Nature's Living Planet Index, freshwater population declines (83% between 1970 and 2014) continue to outpace contemporaneous declines in marine or terrestrial systems...
November 22, 2018: Biological Reviews of the Cambridge Philosophical Society
Niels J Schoffelen, Wiebke Mohr, Timothy G Ferdelman, Sten Littmann, Julia Duerschlag, Mikhail V Zubkov, Helle Ploug, Marcel M M Kuypers
Single-cell measurements of biochemical processes have advanced our understanding of cellular physiology in individual microbes and microbial populations. Due to methodological limitations, little is known about single-cell phosphorus (P) uptake and its importance for microbial growth within mixed field populations. Here, we developed a nanometer-scale secondary ion mass spectrometry (nanoSIMS)-based approach to quantify single-cell P uptake in combination with cellular CO2 and N2 fixation. Applying this approach during a harmful algal bloom (HAB), we found that the toxin-producer Nodularia almost exclusively used phosphate for growth at very low phosphate concentrations in the Baltic Sea...
November 21, 2018: Scientific Reports
Silvia E Zieger, Sergio Seoane, Aitor Laza-Martínez, Anna Knaus, Günter Mistlberger, Ingo Klimant
Early stage identification of harmful algal blooms (HABs) has gained significance for marine monitoring systems over the years. Various approaches for in situ classification have been developed. Among them, pigment-based taxonomic classification is one promising technique for in situ characterization of bloom compositions, although it is yet underutilized in marine monitoring programs. To demonstrate the applicability and importance of this powerful approach for monitoring programs, we combined an ultra low-cost and miniaturized multichannel fluorometer with Fisher's linear discriminant analysis (LDA)...
November 30, 2018: Environmental Science & Technology
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"