Article
Biodiversity Conservation
Yulia Zakharova, Artyom Marchenkov, Darya Petrova, Yurij Bukin, Aleksey Morozov, Yekaterina Bedoshvili, Yulia Podunay, Olga Davidovich, Nikolai Davidovich, Alexander Bondar, Maria Kahlert, Yelena Likhoshway
Summary: This study investigated the delimitation and circumscription of Fragilaria and Ulnaria species, two closely related diatom genera. Strains from Lake Baikal were compared with species from freshwater reservoirs in Europe and Asia. Phylogenetic analysis of rbcL and 18S rRNA genes revealed that the baikalian F. radians clade was distinct from other species of the genus. Ulnaria species were grouped into three clades: U. acus, U. ulna, and U. danica. Morphological characteristics and genetic distance analysis supported the differentiation between species within these genera.
Article
Environmental Sciences
Natalia Tseplik, Sergey Genkal, Yevhen Maltsev, Irina Kuznetsova, Maxim Kulikovskiy
Summary: Representatives of the Achnanthidium minutissimum complex from the Transbaikal region, Russia, were studied, and three new species were described based on morphological and molecular data. The new species show distinct differences from known species and are only found in the Transbaikal region.
Article
Engineering, Marine
Daeryul Kwon, Mirye Park, Chang Soo Lee, Chaehong Park, Sang Deuk Lee
Summary: Lagoons are natural bodies of water isolated from the sea by sand bars or spits, with distinct ecological characteristics and serving as habitats for migratory birds. Different from estuaries, lagoons are actively studied for their unique biodiversity. The discovery of 11 previously unrecorded diatom species in Korean lagoons highlights the importance of continued research and conservation efforts for these ecosystems.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Plant Sciences
Honghan Liu, Zhen Wang, Weiwei Wu, Chenhong Li, Jiawei Zhang, Yahui Gao, Xuesong Li, Lin Sun, Junrong Liang, Jun Zhang, Changping Chen
Summary: Ambo dajingensis is a new species of diatom found in sand grains collected from Dajing Beach, China. This study provides a morphological description of the species using light microscopy and scanning electron microscopy. The new species is characterized by elongated elliptic valves with rounded apices and internal costae.
Article
Plant Sciences
Ewa Gorecka, Matt P. Ashworth, Nikolai Davidovich, Olga Davidovich, Przemyslaw Dabek, Jamal S. M. Sabir, Andrzej Witkowski
Summary: New insights into the marine monoraphid diatom genera Schizostauron and Astartiella were presented, including descriptions of new species, based on molecular and morphological data. Despite the absence of unambiguous morphological synapomorphies between the two genera, they are closely related by DNA sequence data. Molecular results exclude Schizostauron and Astartiella from three clades of exclusively monoraphid diatoms, placing them instead in the Stauroneidaceae family, and their morphological features can also be found in other genera within this clade. The only common feature with monoraphid diatoms as a whole is the heterovalvy of frustules.
JOURNAL OF PHYCOLOGY
(2021)
Article
Plant Sciences
Natalia D. Tseplik, Yevhen I. Maltsev, Anton M. Glushchenko, Irina V. Kuznetsova, Sergei I. Genkal, Evgeniy S. Gusev, Maxim S. Kulikovskiy
Summary: A new monoraphid diatom species, Achnanthidium gladius sp. nov., is described based on molecular data and morphological analysis. The new species is distinguished from similar species by absence of a fascia on raphe valve, cell size, and striae density and pattern, and is known only from Indonesia. Comparisons with closely related species are provided.
Article
Marine & Freshwater Biology
Kazuki Sugawara, Hidekazu Suzuki, Mitsunobu Kamiya, Keigo Osada, Andrzej Witkowski
Summary: The study identified two species of Nagumoea diatoms from the Japanese coasts, Nagumoea africana and Nagumoea serrata, with high intra- and inter-specific divergences. Molecular phylogenetic analysis placed Nagumoea as a potential member of the Bacillariales order or its closely related outgroup. However, the exact phylogenetic position of Nagumoea with respect to other Bacillarialean members remains uncertain.
PHYCOLOGICAL RESEARCH
(2023)
Article
Plant Sciences
Anton Glushchenko, Elena Kezlya, Yevhen Maltsev, Sergei Genkal, John Patrick Kociolek, Maxim Kulikovskiy
Summary: In this study, four strains belonging to the genus Sellaphora were isolated from soils of Cat Tien National Park and identified through morphological and molecular studies. A new species named Sellaphora terrestris sp. nov. was proposed. An evolutionary distance matrix based on the 18S rDNA gene, including the V4 domain, revealed that the new species shared 94.1-97.2% similarities with other Sellaphora sequences. The new species showed morphological similarity to previously identified representatives of the genus Microcostatus.
Article
Biochemistry & Molecular Biology
Anna Santin, Luigi Caputi, Antonella Longo, Maurizio Chiurazzi, Maurizio Ribera d'Alcala, Monia Teresa Russo, Maria Immacolata Ferrante, Alessandra Rogato
Summary: Diatoms are a diverse group of phytoplankton with chimeric genomes containing genes from bacteria, animals, and plants. A comprehensive characterization of the Nitrate Transporter 1/Peptide Transporter Family (NPF) in diatoms revealed complex structures and functions that may play a crucial role in diatoms' adaptability to different environmental conditions.
Article
Limnology
Phil M. Novis, Tracey J. Bell, Putri Fraser, Cara A. Luiten, Simon F. R. Hinkley, Hugo Borges, Marc Schallenberg
Summary: The study reported two quantification methods for lake snow in New Zealand, utilizing chemical assay and atomic absorption methods to measure its components. Cell densities had poor correlation with lake snow abundance, while expression of the chitin synthase gene in summer/autumn correlated with the abundance of chitin component of lake snow.
Article
Engineering, Marine
Yuriko Jocselin Martinez, David Alfaro Siqueiros-Beltrones, Ana Judith Marmolejo-Rodriguez
Summary: Studies on marine benthic diatoms in metal-contaminated environments are rare, showing that diatom assemblages respond with lower species richness and abnormal morphology. On the other hand, in unpolluted environments, benthic diatom communities display a normal structure with high species richness.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Environmental Sciences
Jie Ma, Fengyuan Chen, Zhen Zhang, Yanping Li, Jingli Liu, Ciara Chun Chen, Ke Pan
Summary: Wearing facemasks is an important strategy to combat COVID-19, but used masks are becoming widespread plastic wastes in the oceans, potentially impacting marine organisms. A study found that the eukaryotic community on discarded masks was significantly different from that in the surrounding seawater. The diversity of colonizing organisms peaked initially and decreased over time, with diatoms forming biofilms on masks followed by other species.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Biochemistry & Molecular Biology
Ewa Gorecka, Romain Gastineau, Nikolai A. Davidovich, Olga I. Davidovich, Matt P. Ashworth, Jamal S. M. Sabir, Claude Lemieux, Monique Turmel, Andrzej Witkowski
Summary: This study presents the complete plastid and mitochondrial genomes of the monoraphid diatom Schizostauron trachyderma for the first time, showing a close relationship between S. trachyderma and fistula-bearing species of biraphid diatoms through multigene phylogenies.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Plant Sciences
Yu Zhang, Ji-Shu Guo, John Patrick Kociolek, Yan-Ling Li
Summary: The new species Navicula fuxianturriformis, collected from Lake Fuxian in Yunnan Province, China, is described based on observations using light and scanning electron microscopes. It possesses distinct morphological features that differentiate it from other similar species. This study contributes to our knowledge of the morphology and distribution of the genus Navicula in China.
Article
Agricultural Engineering
Pankaj Kumar Singh, Raya Bhattacharjya, Thomas Kiran Marella, Abhishek Saxena, Bharti Mishra, Saverio Savio, Roberta Congestri, Raveendran Sindhu, Parameswaran Binod, Archana Tiwari
Summary: This study explored the response of growth and cellular biochemical composition of diatom algae to different silica concentrations and medium pH. The results showed that certain diatom species had faster growth rates and higher carbohydrate and protein contents under specific silica concentrations and pH conditions. Silica concentration positively influenced chlorophyll and carotenoid content, and an ideal silica concentration and pH were identified for lipid production. These findings are important for the commercial production of biomolecules using diatom algae.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Ewa Gorecka, Przemyslaw Dabek, Nikolai Davidovich, Olga Davidovich, Rejean Tremblay, Claude Belzile, Romain Gastineau, Andrzej Witkowski
Summary: This study focuses on determining the mating type of Schizostauron trachyderma and examining the relationship between cell size, lipid droplet size, and lipid content among diatoms with similar cell dimensions. The results of the experiments indicate correlations between cell size, the number of neutral lipids per cell, and the size of lipid droplets.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Pharmacology & Pharmacy
Marta Marzec, Przemyslaw Dlbek, Andrzej Witkowski, Fernanda Monedeiro, Pawel Pomastowski, Boguslaw Buszewski, Izabela Nowak
Summary: In this study, lipid nanocarriers based on microalgae oil and lipids extracted from diatoms were successfully produced using the high shear homogenization method. The physicochemical parameters of the obtained lipid nanocarriers were optimized, and the samples with the best parameters were selected for further study. The lipid nanoparticles obtained had small size, low polydispersity index, and positive charge, which could facilitate electrostatic bonding with the negatively charged skin surface. Moreover, they exhibited good stability at room temperature.
Article
Chemistry, Physical
Weronika Brzozowska, Myroslav Sprynskyy, Izabela Wojtczak, Przemyslaw Dabek, Michal J. Markuszewski, Andrzej Witkowski, Boguslaw Buszewski
Summary: Diatoms are a large group of microalgae that can synthesize complex structures. This study aims to enhance the optical properties of diatoms by investigating their ability to incorporate titanium into their cell walls.
Article
Plant Sciences
Hyesuk Kim, Jong Seong Khim, Andrzej Witkowski, Jinsoon Park
Summary: The genus Fogedia was established in 1997 and subsequently expanded to include a total of 13 species, with the description of a new species called Fogedia orientalis sp. nov. The morphological similarities and differences of the new species, as well as the global distribution of all 13 Fogedia species, have been provided.
Article
Plant Sciences
Catherine Riaux-Gobin, Andrzej Witkowski, Michel Coste, Veronique Berteaux-Lecellier, Genovefa Daniszewska-Kowalczyk
Summary: This study investigated marine diatoms, particularly Cocconeidaceae, in the South Province of New Caledonia. The species diversity varied across different habitats, ranging from low diversity on mangrove mud flats to high diversity on the pneumatophores of Avicennia marina. Diatoms were scarce in macroalgae and in the feces of Acanthopleura gemmata. Interestingly, some taxa previously considered rare in Polynesia were found to be common in New Caledonia.
Review
Chemistry, Physical
Piya Roychoudhury, Rahul Bose, Przemyslaw Dabek, Andrzej Witkowski
Summary: The siliceous exoskeletal shells of diatoms, known as frustules, have attracted attention for their photoluminescence property and high volume to surface area ratio. They can enhance the plasmonic sensitivity of metal nanoparticles and have excellent adsorption and absorption capabilities, which have been utilized in wastewater treatment. By conjugating noble metals with diatom frustules, the metals become more stable and effective.
Article
Biodiversity Conservation
Carlos Rafael Borges Mendes, Raul Rodrigo Costa, Afonso Ferreira, Bruno Jesus, Virginia Maria Tavano, Tiago Segabinazzi Dotto, Miguel Costa Leal, Rodrigo Kerr, Carolina Antuarte Islabao, Andrea de Oliveira da Rocha Franco, Mauricio M. M. Mata, Carlos Alberto Eiras Garcia, Eduardo Resende Secchi
Summary: Based on a 11-year in-situ dataset, researchers found that cryptophytes are gradually replacing diatoms as the basis of the food web in the western Antarctic Peninsula (WAP). Their study demonstrates a strong coupling between cryptophyte biomass accumulation, summer upper ocean stability, and mixed layer depth. These findings shed light on the importance of niche separation between diatoms and cryptophytes in understanding the WAP marine ecosystem.
GLOBAL CHANGE BIOLOGY
(2023)
Article
Microbiology
Andrea de O. da R. Franco, Matt P. Ashworth, Clarisse Odebrecht
Summary: Several automated molecular methods were tested for their accuracy in identifying microalgal species, particularly diatoms. Models such as ABGD, ASAP, SPNA, and PTP performed well in identifying diatom species, while the GMYC model had the least agreement with previous identification data. These models can be useful tools for identifying cryptic or closely related diatom species with limited sequence data.
JOURNAL OF EUKARYOTIC MICROBIOLOGY
(2023)
Article
Chemistry, Medicinal
Aleksandra Golubeva, Piya Roychoudhury, Przemyslaw Dabek, Oleksandra Pryshchepa, Pawel Pomastowski, Jagoda Palczynska, Piotr Piszczek, Michal Gloc, Renata Dobrucka, Agnieszka Feliczak-Guzik, Izabela Nowak, Boguslaw Buszewski, Andrzej Witkowski
Summary: The porous siliceous frustules extracted from the diatom species Halamphora cf. salinicola, grown under laboratory conditions, can be used as a novel biological adsorbent to effectively remove diazo and basic dyes from aqueous solutions.
Article
Plant Sciences
David G. Mann, Norico Yamada, John J. Bolton, Andrzej Witkowski, Rosa Trobajo
Summary: Durinskia capensis is a species of kleptoplastic dinoflagellate found in high intertidal marine rock pools. It relies on certain diatoms, particularly Nitzschia captiva, as its kleptoplastids for survival. Without a supply of these essential diatoms, D. capensis loses its kleptoplastids and dies. Nitzschia captiva differs morphologically from other Nitzschia species and is described as a new species.
Article
Ecology
Norico Yamada, Bernard Lepetit, David G. Mann, Brittany N. Sprecher, Jochen M. Buck, Paavo Bergmann, Peter G. Kroth, John J. Bolton, Przemyslaw Dabek, Andrzej Witkowski, So-Yeon Kim, Rosa Trobajo
Summary: Dinotoms, belonging to the family Kryptoperidiniaceae, have diatom-derived endosymbionts and go through three evolutionary stages. D. capensis is able to use various diatom species as kleptoplastids and exhibits different photosynthetic capacities depending on the diatom species. The ability of D. capensis to ingest supplemental diatoms as kleptoplastids may be a flexible strategy to use these diatoms as emergency supplies.
Article
Marine & Freshwater Biology
Mateusz Rybak, Anton Glushchenko, Andrzej Witkowski, Horst Lange-Bertalot, Maxim Kulikovskiy
Summary: This study describes four new species of the genus Orthoseira from Southeast Asia and Easter Island, as well as provides a solution to the taxonomical history of Liparogyra circularis Ehrenberg and a detailed description of Orthoseira tropica (Krasske) Metzeltin & Lange-Bertalot.