Article
Engineering, Marine
Youngjin Choi, Youngmin Park, Weol-Ae Lim, Seung-Hwan Min, Joon-Soo Lee
Summary: In this study, the occurrence of Cochlodinium polykrikoides bloom was predicted using convolutional neural networks. The experimental results showed a prediction accuracy of above 80%.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Environmental
Hye-Jin Lee, Minjung Shin, Min Sik Kim, Taewan Kim, Ki-Myeong Lee, Noh-Back Park, Jong-Chan Lee, Changha Lee
Summary: This study evaluated four different chemical disinfectants for their potential use in inland fish farms to control red tides. It found that ozone (O3) and permanganate (MnO4 ) showed the highest efficacy in inactivating C. polykrikoides cells. Sodium hypochlorite (NaOCl) and hydrogen peroxide (H2O2) also showed effectiveness but produced byproducts and had lower toxicity to fish. Based on the overall factors, H2O2 was suggested as the most practical disinfectant for controlling red tides in inland fish farms.
Article
Microbiology
Hui Wang, Jang-Seu Ki
Summary: The novel MCA gene PmMCA was cloned from the harmful dinoflagellate Prorocentrum minimum, and its expression and cell apoptosis were significantly induced under copper exposure, affecting cell growth. These findings suggest that PmMCA may be involved in PCD triggered by copper stress.
CURRENT MICROBIOLOGY
(2021)
Article
Ecology
Jang-Geun Choi, Thomas C. Lippmann, Elizabeth L. Harvey
Summary: A modified NPZD ecosystem model is used to investigate the effects of predation avoidance on harmful algal blooms (HABs). The addition of a phytoplankton group with slower nutrient uptake and better predation avoidance characteristics in the model helps resolve HAB development caused by predation avoidance. The presence of zooplankton is necessary for the system to reach equilibrium, where only the non-harmful phytoplankton group can survive against the HAB group in resource competition. The model's analytical results contribute to HAB modeling strategies and guide the determination of model coefficients for resolving HAB events.
ECOLOGICAL MODELLING
(2023)
Article
Chemistry, Physical
Yuri Kim, A. Ponomarev
Summary: Exposure to an electron beam at <= 1 kGy dose leads to inactivation of more than 4/5 of the population of Cochlodinium polykrikoides and Alexandrium catenella toxic microalgae via damage to cell walls, degradation of chloroplasts, and cell aggregation. The neutralization of paralytic toxins also occurs. Due to the low doses, efficiency, and simplicity of irradiation, electron beam treatment can be a promising method of controlling red tides in seawater.
RADIATION PHYSICS AND CHEMISTRY
(2021)
Article
Limnology
Jilian Xiong, Jian Shen, Qubin Qin, Michelle C. Tomlinson, Yinglong J. Zhang, Xun Cai, Fei Ye, Linlin Cui, Margaret R. Mulholland
Summary: Climate change and nutrient pollution are contributing factors to the global expansion of harmful algal blooms. A novel LPT-Bio model that combines high-resolution numerical modeling and remote sensing has been developed to better predict the spatial distributions and underlying controls of these blooms. The model successfully captured the intensity and extent of a specific algal bloom in the lower Chesapeake Bay and demonstrated reliable prediction capabilities for 7-10 days.
LIMNOLOGY AND OCEANOGRAPHY LETTERS
(2023)
Article
Biotechnology & Applied Microbiology
Young Kyun Lim, Seongjin Hong, Seung Ho Baek
Summary: Typhoons that suspend sediment-based diatoms directly affect bacterial communities and decrease harmful dinoflagellate blooms.
JOURNAL OF APPLIED PHYCOLOGY
(2022)
Article
Marine & Freshwater Biology
Young Kyun Lim, Jin Ho Kim, Hyejoo Ro, Seung Ho Baek
Summary: This study investigated the effect of high temperature conditions on the diel vertical migration (DVM) of the harmful dinoflagellate Cochlodinium polykrikoides, which causes mass mortality of farmed fish. The field and laboratory results indicate that C. polykrikoides uses thermotaxic DVM as an important ecological strategy to optimize environmental conditions for growth through vertical positioning and changing migration velocity.
Article
Biotechnology & Applied Microbiology
Young Kyun Lim, Giseop Lee, Bum Soo Park, Hong-Yeon Cho, Jin-Yong Choi, Seung Ho Baek
Summary: The research found that typhoons have a significant influence on the bloom and termination of the harmful alga Cochlodinium polykrikoides, particularly in terms of wind direction and wave energy. The level of wave energy plays a critical role in terminating the blooms of C. polykrikoides during typhoons.
JOURNAL OF APPLIED PHYCOLOGY
(2021)
Article
Biochemistry & Molecular Biology
Lisandra Benitez-Alvarez, Laia Leria, Rosa Fernandez, Eduardo Mateos, Younes El Ouanighi, Nard Bennas, Majida El Alami, Mohamed Yacoubi-Khebiza, Houssam Ayt Ougougdal, Marta Riutort
Summary: Using large data sets obtained from transcriptomic data, we investigated the evolutionary history of the genus Dugesia in the Mediterranean region. The results showed that the region's paleogeological history played a significant role in the diversification of the genus. Multiple biogeographic clades were identified, and their internal relationships were analyzed. This study provides insights into the evolution of Dugesia and marks the beginning of the genomic era in phylogenetic studies on Tricladida.
MOLECULAR PHYLOGENETICS AND EVOLUTION
(2023)
Article
Marine & Freshwater Biology
Hyun-Jung Kim, Gaeul Jeoung, Kang Eun Kim, Joon Sang Park, Donhyug Kang, Seung Ho Baek, Chol Young Lee, Hansoo Kim, Sungho Cho, Taek-Kyun Lee, Seung Won Jung
Summary: This study investigated the co-variance between common free-living bacteria and Cochlodinium polykrikoides harmful algal blooms (HABs) and their metabolic functions in the Southern Sea of South Korea. It was found that in high-severity HABs, inorganic phosphorous and dissolved organic carbon concentrations were strongly correlated with C. polykrikoides density. The relative abundances of Gammaproteobacteria also increased when C. polykrikoides blooms intensified. Functional analysis showed that chemoheterotrophy-related functions were more common in high-severity sites of HABs than in other groups. The occurrence of HABs highlighted their interactions with bacteria and affected the bacterial community structure and metabolic functions.
Article
Environmental Sciences
Hye-Eun Kang, Tae-Ho Yoon, Jong-Woo Park, Weol-Ae Lim, Chang-Keun Kang, Hyun-Woo Kim
Summary: This study aimed to investigate the possibility of early warning for Cochlodinium polykrikoides blooms in southern Korean waters using qPCR and metabarcoding analysis. The early warning potential of C. polykrikoides was confirmed through qPCR, and metabarcoding analysis identified microbial organisms related to the blooms. Although no single group could explain the successive blooms, four taxa were found to be related to C. polykrikoides blooms. Additionally, a multi-year metabarcoding analysis revealed differentiation in the phytoplankton community structure.
Article
Environmental Sciences
Darren de Silva, Christopher J. Gobler
Summary: Hard clams have a strong resistance to harmful algal blooms caused by Margalefidinium polykrikoides. They can actively clear moderate concentrations of M. polykrikoides cells, and the clearance rates are influenced by the density of blooms. R. salina and CPSB-1G strain are cleared faster than other M. polykrikoides populations.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Microbiology
Albert Rene, Elisabet Alacid, Rachele Gallisai, Aurelie Chambouvet, Alan D. Fernandez-Valero, Esther Garces
Summary: Perkinsea is a phylogenetic group of protists that includes parasites of distantly related hosts. Two new parasitoid species infecting dinoflagellates were reported in this study, with one clustering within Parviluciferaceae and the other in a distinct branch. Laboratory cross-infection experiments showed that the parasitoid host range is restricted to dinoflagellates, even across different genera.
FRONTIERS IN MICROBIOLOGY
(2021)
Article
Marine & Freshwater Biology
Young Kyun Lim, Bum Soo Park, Jin Ho Kim, Sang-Soo Baek, Seung Ho Baek
Summary: The study found that in 2018, high water temperatures and heatwaves in Korean coastal waters led to the bloom of harmful dinoflagellate Cochlodinium polykrikoides. Early stratification conditions played a critical role in the algae bloom, but maintaining the bloom under high water temperatures had a negative impact.
Article
Plant Sciences
Nagore Sampedro, Albert Rene, Jislene Matos, Jose-Manuel Fortuno, Esther Garces
Summary: This study described a new species of Ansanella and observed a new type of extrusome, providing insights into the evolution of dinoflagellate extrusomes. Metabarcoding analysis revealed the widespread distribution of the genus Ansanella along the Catalan coast, with a significant contribution to dinoflagellate communities in three different coastal habitats.
EUROPEAN JOURNAL OF PHYCOLOGY
(2022)
Article
Plant Sciences
Laura Arin, Albert Rene, Rachele Gallisai, Diana Sarno, Esther Garces, Marta Estrada
Summary: This study explored the diversity of small forms of Chaetoceros in the NW Mediterranean coastal waters, identifying four different strains belonging to two distinct species through morphological and molecular characterization. It proposed that C. tenuissimus and C. salsugineus are synonyms, and discovered a new species, C. olympicus, which alternates between solitary and chain-forming forms. The importance of morphological variability in species identification was highlighted.
EUROPEAN JOURNAL OF PHYCOLOGY
(2022)
Review
Microbiology
Sarah Itoiz, Sebastian Metz, Evelyne Derelle, Albert Rene, Esther Garces, David Bass, Philippe Soudant, Aurelie Chambouvet
Summary: The last century has seen an increase in the emergence of new diseases, leading to a loss of biodiversity. Perkinsea is a microeukaryotic parasitic phylum with a broad range of hosts. In marine environments, there are currently three lineages infecting dinoflagellates, mollusks, and fish, while in freshwater environments, there is only one lineage infecting frog tadpoles. High-throughput sequencing methods have revealed that Perkinsea is more diverse than previously described, especially in freshwater environments. This review summarizes the biological and ecological traits of Perkinsea and highlights their diversity and ubiquity in association with a wide range of hosts.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Genetics & Heredity
Anders K. Krabberod, Ina M. Deutschmann, Marit F. M. Bjorbaekmo, Vanessa Balague, Caterina R. Giner, Isabel Ferrera, Esther Garces, Ramon Massana, Josep M. Gasol, Ramiro Logares
Summary: This study investigated the core pelagic microbiota in a long-term marine-coastal observatory in the Mediterranean Sea. The results showed that the interactions between core microbes were more deterministic in winter than in other seasons. These core microbes play an essential role in the functioning of the ecosystem throughout the year.
ENVIRONMENTAL MICROBIOME
(2022)
Article
Microbiology
Alan Denis Fernandez-Valero, Albert Rene, Natalia Timoneda, Nagore Sampedro, Esther Garces
Summary: This study evaluated the diversity of Chytridiomycota in phytoplankton communities in the NW Mediterranean Sea and demonstrated their interactions with their hosts. The relative abundance of Chytrids was highest in samples dominated by dinoflagellates, indicating the presence of specific chytrid communities. The study also identified and described three species of Chytridiomycota, including one of the most abundant environmental sequences and two previously undescribed species.
ENVIRONMENTAL MICROBIOLOGY
(2022)
Article
Marine & Freshwater Biology
Albert Rene, Elisabet Alacid, Andrey E. Vishnyakov, Kensuke Seto, Victoria S. Tcvetkova, Jordina Gordi, Maiko Kagami, Anke Kremp, Esther Garces, Sergey A. Karpov
Summary: A new chytrid genus and species, Paradinomyces triforaminorum gen. nov. sp. nov., was isolated and cultured from samples in the Baltic Sea. Molecular phylogeny and morphological features were used to determine its classification and phylogenetic relationships. Laboratory experiments showed the species to be highly specific and impacting the host's bloom. In addition, the chytrid co-occurred with other parasites, indicating common parasitic interactions during high-biomass bloom events.
Article
Marine & Freshwater Biology
Massimo C. Pernice, Daniel Closa, Esther Garces
Summary: Extracellular Vesicles (EVs) are believed to be an important method of transport and communication in the marine microbial community. However, isolating and characterizing EVs from axenic cultures of microbial eukaryotes remains a technological challenge. This study successfully isolated EVs from a near-axenic culture of the toxic dinoflagellate Alexandrium minutum using Cryo TEM. The EVs were classified into five major groups based on their morphotype and were found to have an average diameter of 0.36 μm. This descriptive work aims to be the first step in studying the potential role of EVs in the toxicity of dinoflagellates.
Article
Marine & Freshwater Biology
Albert Rene, Natalia Timoneda, Diana Sarno, Roberta Piredda, Gianpaolo Zampicinini, Adriana Zingone, Marina Montresor, Esther Garces
Summary: The presence and interactions of phytoplankton parasites, particularly Chytridiomycota, in the water column and sediments of the Gulf of Naples were investigated. Diatoms were found to dominate the upper layers of the water column, and Chytridiomycota were predominantly present in these layers, coinciding with diatom distribution. Laboratory incubations confirmed parasitic interactions between Chytridiomycota and diatoms. A 3-year metabarcoding time-series analysis revealed the recurrent presence of chytrids, but no clear patterns of co-occurrence with diatoms were observed. The chytrid community in sediments showed higher diversity compared to the water column samples. Overall, parasites were found to be a common component of the marine protist communities and understanding their interactions is crucial for understanding phytoplankton dynamics.
MARINE ECOLOGY-AN EVOLUTIONARY PERSPECTIVE
(2023)
Book Review
Plant Sciences
Mona Hoppenrath, Albert Rene
Article
Ecology
Alan Denis Fernandez-Valero, Albert Rene, Natalia Timoneda, Nuria Pou-Sola, Jordina Gordi, Nagore Sampedro, Esther Garces
Summary: This study investigates the temporal dynamics of the epiphytic protist community on macroalgae, focusing on fungi and the interactions with zoosporic chytrid parasites and dinoflagellate proliferation. Metabarcoding sequencing reveals changes in the dominant members of the fungal community, with Chytridiomycota becoming dominant during the mature phase of the biofilm. Co-culture experiments show intraspecific variability in the interaction between the chytrid parasite D. arenysensis and the dinoflagellate Ostreopsis, highlighting a facultative parasitic lifestyle.
ISME COMMUNICATIONS
(2023)
Correction
Plant Sciences
Laura Arin, Albert Rene, Rachele Gallisai, Diana Sarno, Esther Garces, Marta Estrada
EUROPEAN JOURNAL OF PHYCOLOGY
(2022)