Satellite discrimination of Karenia mikimotoi and Phaeocystis harmful algal blooms in European coastal waters: Merged classification of ocean colour data

Harmful Algae ◽  
2014 ◽  
Vol 31 ◽  
pp. 163-176 ◽  
Author(s):  
A.A. Kurekin ◽  
P.I. Miller ◽  
H.J. Van der Woerd
Keyword(s):  
Coastal Waters ◽  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Ocean Colour ◽  
Karenia Mikimotoi

Comparison of bacterial communities associated with Prorocentrum donghaiense and Karenia mikimotoi strains from Chinese coastal waters

2020 ◽  
Vol 71 (12) ◽  
pp. 1662
Author(s):  
Ruoyu Guo ◽  
Pengbin Wang ◽  
Douding Lu ◽  
Xinfeng Dai
Keyword(s):  
Coastal Waters ◽  
Bacterial Communities ◽  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Formation Mechanisms ◽  
Prorocentrum Donghaiense ◽  
Karenia Mikimotoi ◽  
Bloom Formation ◽  
Degrading Bacteria ◽  
Different Characteristics

The dinoflagellates Karenia mikimotoi (toxic) and Prorocentrum donghaiense (non-toxic) have caused serious blooms in Chinese coastal waters. Although many studies have investigated the mechanisms underlying the harmful algal blooms of these two species, research on bacterial communities associated with K. mikimotoi and P. donghaiense is still limited. In this study, the composition of associated bacterial communities of K. mikimotoi and P. donghaiense were investigated in cultured strains. The genera with the highest relative abundance in K. mikimotoi and P. donghaiense cultures were Balneola and Marinobacter respectively. There were 26 genera specifically present in K. mikimotoi cultures, including Alteromonas, Methylophaga and Thalassospira. Sixteen genera were specifically present in P. donghaiense cultures, including an unclassified genus belonging to Nannocystaceae, Loktanella and Roseivirga. Various aromatic hydrocarbons capable of degrading bacteria were detected in the K. mikimotoi culture, but not in the P. donghaiense culture; this may contribute to the toxicity or toxin synthesis of K. mikimotoi. The results of this study provide further insights into bloom formation mechanisms and elucidate the different characteristics of K. mikimotoi and P. donghaiense blooms.

scholarly journals Comparative analysis of full-length mitochondrial genomes of five Skeletonema species reveals conserved genome organization and recent speciation

BMC Genomics ◽  
2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Shuya Liu ◽  
Yichao Wang ◽  
Qing Xu ◽  
Mengjia Zhang ◽  
Nansheng Chen
Keyword(s):  
Molecular Markers ◽  
Coastal Waters ◽  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Phylogenetic Analyses ◽  
Time Estimation ◽  
Single Species ◽  
Full Length ◽  
Comparative Genomic ◽  
Primary Producers

Abstract Background Skeletonema species are prominent primary producers, some of which can also cause massive harmful algal blooms (HABs) in coastal waters under specific environmental conditions. Nevertheless, genomic information of Skeletonema species is currently limited, hindering advanced research on their role as primary producers and as HAB species. Mitochondrial genome (mtDNA) has been extensively used as “super barcode” in the phylogenetic analyses and comparative genomic analyses. However, of the 21 accepted Skeletonema species, full-length mtDNAs are currently available only for a single species, S. marinoi. Results In this study, we constructed full-length mtDNAs for six strains of five Skeletonema species, including S. marinoi, S. tropicum, S. grevillei, S. pseudocostatum and S. costatum (with two strains), which were isolated from coastal waters in China. The mtDNAs of all of these Skeletonema species were compact with short intergenic regions, no introns, and no repeat regions. Comparative analyses of these Skeletonema mtDNAs revealed high conservation, with a few discrete regions of high variations, some of which could be used as molecular markers for distinguishing Skeletonema species and for tracking the biogeographic distribution of these species with high resolution and specificity. We estimated divergence times among these Skeletonema species using 34 mtDNAs genes with fossil data as calibration point in PAML, which revealed that the Skeletonema species formed the independent clade diverging from Thalassiosira species approximately 48.30 Mya. Conclusions The availability of mtDNAs of five Skeletonema species provided valuable reference sequences for further evolutionary studies including speciation time estimation and comparative genomic analysis among diatom species. Divergent regions could be used as molecular markers for tracking different Skeletonema species in the fields of coastal regions.

scholarly journals Action Plan for Monitoring, Mitigation and Management of Harmful Algal Blooms in the Coastal Waters of Oman

2007 ◽  
Vol 12 (2) ◽  
pp. 75
Author(s):  
A.Y.A AlKindi ◽  
H.M.H. Al-Ghelani ◽  
S. Amer ◽  
Y.K Al-Akhzami
Keyword(s):  
Coastal Waters ◽  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Red Tide ◽  
Action Plan ◽  
Rapid Response System ◽  
Gulf Of Oman ◽  
Trichodesmium Erythraeum ◽  
Response System ◽  
Adverse Impacts

The Gulf of Oman, an ecologically and economically rich ecosystem, is frequently impacted by occurrences of harmful algal blooms. Recent studies indicate an increase in the number of causative species and harmful impacts. Many red tide incidents in Oman have been found leading to hypoxia. The frequent bloom forming species here are Karenia selliformis, Nitzschia pungens, Prorocentrum arabianum and Trichodesmium erythraeum. We review work carried out in this area, and we propose here a Management Action Plan for not only an effective monitoring system for harmful algal blooms (HABs), but also mitigation of their adverse impacts and rapid response system.   

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