Harmful Algae and their Toxins

2014 ◽  
pp. 3-20 ◽  
Author(s):  
Gustaaf Hallegrae
Keyword(s):  
Harmful Algae

scholarly journals The harmful algae,Cochlodinium polykrikoidesandAureococcus anophagefferens, elicit stronger transcriptomic and mortality response in larval bivalves (Argopecten irradians) than climate change stressors

2019 ◽  
Vol 9 (8) ◽  
pp. 4931-4948
Author(s):  
Andrew W. Griffith ◽  
Matthew J. Harke ◽  
Elizabeth DePasquale ◽  
Dianna L. Berry ◽  
Christopher J. Gobler
Keyword(s):  
Climate Change ◽  
Harmful Algae ◽  
Argopecten Irradians ◽  
Mortality Response

scholarly journals An Autonomous Platform for Near Real-Time Surveillance of Harmful Algae and Their Toxins in Dynamic Coastal Shelf Environments

2021 ◽  
Vol 9 (3) ◽  
pp. 336
Author(s):  
Stephanie K. Moore ◽  
John B. Mickett ◽  
Gregory J. Doucette ◽  
Nicolaus G. Adams ◽  
Christina M. Mikulski ◽  
...  
Keyword(s):  
Real Time ◽  
Domoic Acid ◽  
Harmful Algae ◽  
Coastal Trapped Waves ◽  
Resource Managers ◽  
Bloom Formation ◽  
High Concentrations ◽  
Data Gap ◽  
Autonomous Technology

Efforts to identify in situ the mechanisms underpinning the response of harmful algae to climate change demand frequent observations in dynamic and often difficult to access marine and freshwater environments. Increasingly, resource managers and researchers are looking to fill this data gap using unmanned systems. In this study we integrated the Environmental Sample Processor (ESP) into an autonomous platform to provide near real-time surveillance of harmful algae and the toxin domoic acid on the Washington State continental shelf over a three-year period (2016–2018). The ESP mooring design accommodated the necessary subsystems to sustain ESP operations, supporting deployment durations of up to 7.5 weeks. The combination of ESP observations and a suite of contextual measurements from the ESP mooring and a nearby surface buoy permitted an investigation into toxic Pseudo-nitzschia spp. bloom dynamics. Preliminary findings suggest a connection between bloom formation and nutrient availability that is modulated by wind-forced coastal-trapped waves. In addition, high concentrations of Pseudo-nitzschia spp. and elevated levels of domoic acid observed at the ESP mooring location were not necessarily associated with the advection of water from known bloom initiation sites. Such insights, made possible by this autonomous technology, enable the formulation of testable hypotheses on climate-driven changes in HAB dynamics that can be investigated during future deployments.

scholarly journals Harmful algae and export production collapse in the equatorial Atlantic during the zenith of Middle Eocene Climatic Optimum warmth

Geology ◽  
2019 ◽  
Vol 47 (3) ◽  
pp. 247-250 ◽  
Author(s):  
Margot J. Cramwinckel ◽  
Robin van der Ploeg ◽  
Peter K. Bijl ◽  
Francien Peterse ◽  
Steven M. Bohaty ◽  
...  
Keyword(s):  
Middle Eocene ◽  
Harmful Algae ◽  
Equatorial Atlantic ◽  
Export Production ◽  
Climatic Optimum

Dominance of harmful algae, Microcystis spp. and Micrasterias hardyi, has negative consequences for bivalves in a freshwater lake

Harmful Algae ◽  
2021 ◽  
Vol 101 ◽  
pp. 101967
Author(s):  
Megumu Fujibayashi ◽  
Seiko Furuta ◽  
Eiso Inoue ◽  
Satoshi Ichise ◽  
Naoko Takei
Keyword(s):  
Harmful Algae ◽  
Freshwater Lake ◽  
Negative Consequences

Harmful algae blooms removal from fresh water with modified vermiculite

2013 ◽  
Vol 35 (3) ◽  
pp. 340-346 ◽  
Author(s):  
Chunguang Miao ◽  
Yi Tang ◽  
Hong Zhang ◽  
Zhengyan Wu ◽  
Xiangqin Wang
Keyword(s):  
Fresh Water ◽  
Harmful Algae ◽  
Harmful Algae Blooms ◽  
Algae Blooms

Harmful algae are not harmful to everyone

Harmful Algae ◽  
2012 ◽  
Vol 16 ◽  
pp. 74-80 ◽  
Author(s):  
Mads S. Thomsen ◽  
Thibaut de Bettignies ◽  
Thomas Wernberg ◽  
Marianne Holmer ◽  
Bastien Debeuf
Keyword(s):  
Harmful Algae

Maximizing the utilization of photo-generated electrons and holes of g-C3N4 photocatalyst for harmful algae inactivation

2021 ◽  
pp. 134105
Author(s):  
Dongxu Wang ◽  
Juan Chen ◽  
Xin Gao ◽  
Yanhui Ao ◽  
Peifang Wang
Keyword(s):  
Harmful Algae

scholarly journals Investigation of phagotrophy in natural assemblages of the benthic dinoflagellates Ostreopsis, Prorocentrum and Coolia

2017 ◽  
Vol 65 (3) ◽  
pp. 392-399 ◽  
Author(s):  
Eliliane Vasconcelos Corrêa Almada ◽  
Wanderson Fernandes de Carvalho ◽  
Silvia Mattos Nascimento
Keyword(s):  
Fluorescence Microscopy ◽  
Rio De Janeiro ◽  
Nutritional Ecology ◽  
Harmful Algae ◽  
Benthic Dinoflagellates ◽  
Nutritional Strategy ◽  
Nutritional Strategies ◽  
Harmful Species

Abstract Mixotrophy has been shown to be a common trait among dinoflagellates and its importance in the nutritional ecology of harmful algae has been hypothesized. Benthic harmful species have not been extensively investigated as their planktonic counterparts and there are major gaps in the knowledge of their nutritional strategies. In this study the occurrence of phagotrophy was investigated in natural assemblages of benthic dinoflagellates using epi-fluorescence microscopy with DAPI and LysoSensor staining. The study was conducted at five sites along the coast of Rio de Janeiro that were visited in January, August and December 2010. In total, 1659 dinoflagellate cells were observed. From these, only 0.4% of 1195 Ostreopsis cf. ovata and 2.2% of 134 Coolia spp. cells presented evidence of phagotrophy with vacuoles stained by LysoSensor or a DAPI (4',6-diamidino-2-phenylindole) stained inclusion. Stained vacuoles were not registered in the 330 Prorocentrum spp. cells observed. Few O. cf. ovata cells contained round red inclusions ("red spots") that were not stained either by DAPI or LysoSensor, suggesting that these structures are not ingested prey. The results showed that phagotrophy was not a frequent nutritional strategy in benthic dinoflagellates during the study period.

scholarly journals Investigation of the Inhibitory Effects of Mangrove Leaves and Analysis of Their Active Components on Phaeocystis globosa during Different Stages of Leaf Age

2018 ◽  
Vol 15 (11) ◽  
pp. 2434 ◽  
Author(s):  
Min Zhao ◽  
Han Xiao ◽  
Dong Sun ◽  
Shunshan Duan
Keyword(s):  
Secondary Metabolites ◽  
Harmful Algae ◽  
Marine Ecology ◽  
Phenolic Glycoside ◽  
Aqueous Extracts ◽  
Red Tides ◽  
Inhibitory Effects ◽  
Phaeocystis Globosa ◽  
Biological Remediation ◽  
Young Leaves

The presence of harmful algal blooms (HABs) can cause significant problems to the quality of the water, the marine ecosystems, and the human health, and economy worldwide. Biological remediation can inhibit harmful algal growth efficiently in an environmental-friendly manner. Therefore, the research conducted on biological remediation with regard to the inhibition of HABs is becoming a major focus in marine ecology. To date, no study has been reported with regard to the red tides occurring in mangrove wetlands. Therefore, the present study used two mangrove species, namely Bruguiera gymnorrhiza and Kandelia candel and one harmful algae species Phaeocystis globosa as experimental organisms. The present study determined the inhibitory effects and algae physiology of specific aqueous extracts from mangrove leaves on the viability of harmful algae, and analyzed the main chemical composition of the aqueous extracts by ultra-performance liquid chromatography coupled to high resolution mass spectrometry (UPLC-QTOF-MS). The results indicated that the aqueous extracts from different leaf ages of B. gymnorrhiza and K. candel leaves exhibited apparent inhibitory effects on the growth of P. globosa. The inhibitory effects of B. gymnorrhiza and K. candel leaves aqueous extracts on the growth of P. globosa were in the following order: senescent > mature > young leaves. The levels of the parameters superoxide dismutase (SOD) activity, glutathione (GSH), and malondialdehyde (MDA)content in P. globosa following treatment with B. gymnorrhiza and K. candel leaves aqueous extracts were increased as follows: senescent > mature > young leaves. Simultaneously, the intensity of the ion peaks of the specific secondary metabolites assigned 4 (No.: 4 Rt: 2.83 min), 7 (No.: 7 Rt: 3.14 min), 8 (No.: 8 Rt: 3.24 min), 9 (No.: 9 Rt: 3.82min) and 10 (No.: 10 Rt: 4.10 min) were increased. These metabolites were found in the aqueous extracts from B. gymnorrhiza leaves. The intensities of the ion peaks of the secondary metabolites 7, 8 in the aqueous extracts from the K. candel leaves were also increased. The majority of the substances that inhibited the algae found in the mangrove plants were secondary metabolites. Therefore, we considered that the norsesquiterpenes compounds 4, 8, 9, and 10 and a phenolic glycoside compound 7 were the active constituents in the aqueous extracts of the mangrove leaves responsible for the inhibition of algae growth. This evidence provided theoretical guidance for the development of biological methods to control red tides and for the further use of substances with antiproliferative activity against algae.

Sign in / Sign up

Export Citation Format

Share Document