Article
Plant Sciences
Gisele C. Marquardt, Denise C. Bicudo, Carlos E. De M. Bicudo, Marie-Pierre Ledru, Luc Ector, Carlos E. Wetzel
Summary: The study describes a new diatom species found in a Quaternary sediment core from the Colônia basin in Brazil, with unique morphological features distinguishing it from other species. The research contributes to understanding diatom diversity and biogeography in tropical regions, providing a taxonomical basis for using diatoms as biological markers for paleoenvironmental reconstruction.
Article
Plant Sciences
Dany Croteau, Thomas Lacour, Nicolas Schiffrine, Philippe-Israel Morin, Marie-Helene Forget, Flavienne Bruyant, Joannie Ferland, Augustin Lafond, Douglas A. Campbell, Jean-Eric Tremblay, Marcel Babin, Johann Lavaud
Summary: The diatom communities in the Arctic Ocean exhibit different adaptation strategies based on changes in light environment, driving seasonal taxonomic succession. These adaptation strategies are aligned with changes in light intensity, leading to the dominance of different diatom species in different habitats throughout the seasons.
JOURNAL OF ECOLOGY
(2022)
Article
Plant Sciences
Danijela Vidakovic, Zlatko Levkov, Jelena Krizmanic, Bank Beszteri, Bojan Gavrilovic, Milos Ciric
Summary: A new diatom species, Mayamaea pannonica sp. nov., is described using morphological and molecular approaches. It possesses typical characteristics of the genus Mayamaea, but can be distinguished from similar species based on valve outline and shape of the central area. Although a culture of the species is not available, a partial 18S rRNA gene sequence from the same sample suggests the presence of the new species. Saline habitats in Serbia and neighboring countries are endangered, and identifying the species living there is crucial for their preservation.
Article
Oceanography
Jeffrey W. Krause, Michael W. Lomas, Seth L. Danielson
Summary: The study investigated diatom productivity and phytoplankton grazing losses in the northern Bering and Chukchi seas. It found that diatom growth is influenced by nutrients, light, and their interaction, while protozoan grazing intensity is mainly affected by size.
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2021)
Article
Plant Sciences
Aude Beauger, Carlos E. Wetzel, Elisabeth Allain, Clotilde Bertin, Olivier Voldoire, Vincent Breton, Lory-Anne Baker, Sofia Kolovi, David Biron, Luc Ector
Summary: A new species of Chamaepinnularia, named Chamaepinnularia salina, was discovered during a survey of mineral springs in the French Massif Central region. This species has distinct morphological characteristics and prefers mineral springs with a Na-K-HCO3 water type.
Article
Ecology
Jefferson G. Lebkuecher, Jenna L. Atma, Hailey Conn, Daniel J. Redwine
Summary: The genus and composition of algae on rocks near the shore of reservoirs in Middle and East Tennessee were counted in order to analyze their correlation with trophic condition. The results showed that the concentration of epilithic chlorophyll a significantly correlated with the concentration of total phosphorus, but not with the concentration of total nitrogen. Using the concentration of epilithic chlorophyll a as an indicator, the trophic state of the sites was determined and this method provides a new tool for evaluating and monitoring the trophic state of infralittoral sites in reservoirs.
JOURNAL OF FRESHWATER ECOLOGY
(2023)
Article
Environmental Sciences
Alisa A. Neplyukhina, Andrey Tchabovsky, Maria A. Gololobova, Olesya Smyshlyaeva, Olga A. Krylovich, Arkady B. Savinetsky, Alexey A. Kotov
Summary: A diatom analysis of a peat deposit from Shemya Island in the Aleutian Arc, USA revealed that the diatom community was influenced by factors such as sea level change, zoogenic effects, and anthropogenic activities. The study showed that stable global environmental conditions in the Late Holocene led to abrupt changes in the diatom community due to the influence of human and animal activities. Further research on other islands will help form a general picture of changes in diatom communities in the Holocene in connection with regional climatic changes.
Article
Plant Sciences
Aude Beauger, Elisabeth Allain, Olivier Voldoire, Christelle Blavignac, Sofia Rossi, Carlos E. Wetzel, Luc Ector
Summary: A new species of Gomphosphenia was discovered in the diatom survey in the Vault de Chaudefour Nature Reserve in the Massif Central, France. This small-sized species has distinctive characteristics and seems to inhabit headwater streams.
Article
Geography, Physical
Paul B. Hamilton, Scott J. Hutchinson, R. Timothy Patterson, Jennifer M. Galloway, Nawaf A. Nasser, Christopher Spence, Mike J. Palmer, Hendrik Falck
Summary: This study investigated the paleolimnological record of diatoms and climate in a small subarctic lake contaminated by gold smelting waste, revealing six distinct paleoecological assemblages of diatoms over time in response to changing local hydrological and sedimentological conditions. Environmental variables explained 28.8% of the variance in diatom assemblages, with significant correlations to different climate periods. The results demonstrate that paleoclimatic changes and industrial contamination have influenced the ecological evolution of the lake over the past 2800 years.
Article
Plant Sciences
Cristina Delgado, Vitor Goncalves, Saul Blanco, Salome F. P. Almeida
Summary: This study investigated the impact of thermal springs on islands on the distribution of benthic diatom species, analyzed the morphological characteristics of the new diatom species Platichthys furnensis, and compared it with other diatom species. This marks the first description of a Platichthys species in the Northern Hemisphere.
BOTANICAL SCIENCES
(2021)
Article
Plant Sciences
Giuseppina G. Lai, Bachisio M. Padedda, Carlos E. Wetzel
Summary: In this study, a new species, Dorofeyukea ectoriana sp. nov., was described based on diatom samples collected from a small thermo-mineral spring in Sardinia, Italy. The morphological features of the species were examined using light and scanning electron microscopy, and compared with other known species in the genus Dorofeyukea. Dorofeyukea ectoriana was found in slightly alkaline waters with a sodium-chloride composition, medium-high mineralization level, and enrichment of fluoride and phosphorus.
Article
Multidisciplinary Sciences
Stephanie P. McDonnell, Juliana Candelaria, Amanda J. Morton, Anna C. Denicol
Summary: Understanding the process of mammalian folliculogenesis is crucial for improving reproductive technologies. This study presents an efficient mechanical method to isolate large numbers of small preantral follicles from a single bovine ovary, avoiding tissue damage.
JOVE-JOURNAL OF VISUALIZED EXPERIMENTS
(2022)
Article
Plant Sciences
Christopher S. Lobban, Emmanuel S. Santos
Summary: A prevailing hypothesis suggests that microbial species are ubiquitous, but recent studies on freshwater diatoms in Australia and marine Licmophora flora in Guam have shown evidence of regional endemicity. This study compares Australian and Guam Licmophora species, particularly their girdle bands, using light and scanning-electron microscopy.
AUSTRALIAN SYSTEMATIC BOTANY
(2022)
Article
Plant Sciences
Mateusz Rybak, Lukasz Peszek, Lukasz Skoczylas, Thelma Alvim Veiga Ludwig
Summary: The samples for this study were collected from terrestrial mosses and lichens growing on palm tree trunks and concrete walls in Rio de Janeiro, Brazil. A new species from the genus Luticola was discovered and described. The species has a small valve size and abruptly hooked proximal raphe endings. Additionally, the ultrastructure of a similar species, Luticola neglecta, was also studied.
Article
Marine & Freshwater Biology
Dariusz Halabowski, Malgorzata Bak, Iga Lewin
Summary: This paper reports new records of rare diatoms found in Southern Poland, highlighting the impact of anthropogenic salinity on diatom communities. The study confirms the common occurrence of Navicula flandriae and Planothidium nanum in areas affected by salt mine water. Further monitoring of diatoms is necessary to understand their distribution under varying salinity conditions.
OCEANOLOGICAL AND HYDROBIOLOGICAL STUDIES
(2021)
Article
Geography, Physical
Aude Beauger, Karen Serieyssol, Benjamin Legrand, Delphine Latour, Vincent Berthon, Marlene Lavrieux, Yannick Miras
Summary: Lake Aydat's history has been influenced by climate change and human activities, particularly the increase in agricultural pressure. Improving the water quality of the lake will be a challenge due to the high concentrations of cyanobacteria akinetes and nutrients.
QUATERNARY INTERNATIONAL
(2022)
Article
Ecology
Giuseppina G. Lai, Luc Ector, Carlos E. Wetzel, Antonella Luglie, Bachisio M. Padedda
Summary: This study assessed the environmental drivers of benthic diatom assemblages in thermo-mineral springs and found that temperature and conductivity significantly influence the composition, richness, diversity, and evenness of diatom communities.
FRESHWATER SCIENCE
(2022)
Article
Plant Sciences
Lory-Anne Baker, David G. Biron, Fanny Millan, Olivier Voldoire, Vincent Breton, Elisabeth Allain, Carlos E. Wetzel, Luc Ector, Aude Beauger
Summary: This study investigated the ecological metrics and composition of diatom assemblages in mineral springs, and found that environmental location explained a significantly higher portion of diatom composition variability than substrate.
Article
Marine & Freshwater Biology
Lory-Anne Baker, David G. G. Biron, Aude Beauger, Sofia Kolovi, Jonathan Colombet, Elisabeth Allain, Olivier Voldoire, Vincent Breton, Patrick Chardon, Telesphore Sime-Ngando, Karine David, Gilles Montavon, Herve Michel, Angia Sriram Pradeep Ram
Summary: While the link between viruses and prokaryotes in aquatic systems is well-known, there is limited research on this relationship in spring waters. This study examined the abundance of viruses and prokaryotes and identified the environmental factors affecting them in springs with varying levels of naturally occurring radioactivity. The results showed significant differences in viral abundances among springs, with low abundances corresponding to high gamma radiation dose and vice versa. The findings suggest a possible adverse effect of water radioactivity on viruses, explaining the lack of significant relationship between prokaryotic and viral abundances.
Article
Plant Sciences
Livia F. Costa, Carlos E. Wetzel, Gisele C. Maquardt, Jaques E. Zanon, Luc Ector, Denise C. Bicudo
Summary: The present study expands our knowledge on Achnanthidium species in tropical areas of southern Brazil. Through the analysis of numerous samples, 12 Achnanthidium species were identified, including 6 new species. Morphometric analysis was used to differentiate between these species. The study also calculated the ecological optimum and tolerance of 9 common species.
Article
Environmental Sciences
Giuseppina G. Lai, Carlos E. Wetzel, Luc Ector, Antonella Luglie, Bachisio M. Padedda
Summary: This study analyzed diatom assemblages in thermal springs in Sardinia, Italy, and found that low discharge, ecotonal properties, and natural and human disturbances significantly affect the composition of the aquatic communities. Springs connected to rivers and with higher disturbance levels exhibited higher species richness and diversity, while isolated springs harbored smaller pools of taxa with specific habitat preferences or restricted distributions. Environmental variables such as water temperature, river influence, and nutrients also played a major role in shaping the diatom assemblages.
Article
Environmental Sciences
Lory-Anne Baker, Aude Beauger, So fia Kolovi, Olivier Voldoire, Elisabeth Allain, Vincent Breton, Patrick Chardon, Didier Miallier, Celine Bailly, Gilles Montavon, Agnes Bouchez, Frederic Rimet, Cecile Chardon, Valentin Vasselon, Luc Ector, Carlos E. Wetzel, David G. Biron
Summary: Little is known about the low dose effects of radiation on microbial communities in the environment. This study used DNA metabarcoding to investigate the genetic richness, diversity, and structure of diatom communities in 16 mineral springs in the Massif Central, France, and found that geographical location and 238U were the main factors influencing ASVs distribution and diatom ASV structure. The genetic variant of Planothidium frequentissimum associated with high levels of 238U may serve as a bio-indicator of high natural uranium levels.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Plant Sciences
Cheran Radhakrishnan, Sudipta Kumar Das, Carlos E. Wetzel, Balasubramanian Karthick
Summary: We describe a new species of Adlafia called Adlafia kociolekii from aerial habitats in Sikkim, India. The species was observed and described based on light and scanning electron microscopy observations. The main diagnostic features of this species include clear elliptical valves, a narrow axial area at the centre, radiate to convergent striation, and a distinctive Voigt discontinuity at both apices. The ultrastructure of this species, including the presence of a raphe on the elevated sternum, distal raphe ends deflected to opposite sides of proximal ends, and distal ends terminating in long and thickened helictoglossae, distinguishes it as a new species. The species was also found in wet walls and freshwater habitats in northeast India. Morphological features of this species were compared with closely similar taxa of Adlafia and other naviculoid genera.
Article
Plant Sciences
Bart Van De Vijver, Britt Gogne, Gabrielle Hoogsteyns, Levente Van De Velde, Luna Vlaminck, Sija A. Kabota, Lies Teunen, Carlos E. Wetzel
Article
Biodiversity Conservation
Aude Beauger, Olivier Voldoire, Elisabeth Allain, Pierre Gosseaume, Christelle Blavignac, Lory-Anne Baker, Carlos E. E. Wetzel
Summary: This study evaluates the biodiversity of 79 mineral saline springs in the French Massif Central, focusing on species richness and diatom community composition. Physical and chemical factors were found to influence the richness and communities of diatoms, with hardness and certain ions being critical drivers of diatom community composition.
Review
Soil Science
Augusto Zanella, Jean-Francois Ponge, Bernard Jabiol, Bas Van Delft, Rein De Waal, Klaus Katzensteiner, Eckart Kolb, Nicolas Bernier, Giacomo Mei, Manuel Blouin, Jerome Juilleret, Noemie Pousse, Silvia Stanchi, Fernando Cesario, Renee-Claire Le Bayon, Dylan Tatti, Silvia Chersich, Luca Carollo, Michael Englisch, Anna Schroetter, Judith Schaufler, Eleonora Bonifacio, Ines Fritz, Adriano Sofo, Stephane Bazot, Jean-Christophe Lata, Jean-Francois Iffly, Carlos E. Wetzel, Christophe Hissler, Ginevra Fabiani, Michael Aubert, Andrea Vacca, Gianluca Serra, Cristina Menta, Francesca Visentin, Nathalie Cools, Cristian Bolzonella, Lorenzo Frizzera, Roberto Zampedri, Mauro Tomasi, Paola Galvan, Przemyslaw Charzynski, Elina Zakharchenko, Seyed Mohammad Waez-Mousavi, Jean-Jacques Brun, Roberto Menardi, Fausto Fontanella, Nicola Zaminato, Silvio Carollo, Alessio Brandolese, Michele Bertelle, Gaetan Zanella, Thomas Bronner, Ulfert Graefe, Herbert Hager
Summary: This article emphasizes the importance of a standardized classification of humipedons and provides a morpho-functional taxonomy for better understanding and management of soil ecosystems. By measuring and recognizing diagnostic horizons, different humus systems and forms can be identified.
Article
Marine & Freshwater Biology
A. U. D. E. BEAUGER, C. A. R. L. O. S. E. WETZEL, O. L. I. V. I. E. R. VOLDOIRE, E. L. I. S. A. B. E. T. H. ALLAIN, V. I. N. C. E. N. T. BRETON, D. I. D. I. E. R. MIALLIER, L. U. C. ECTOR
Summary: Light and scanning electron microscope observations revealed a new genus Fontina from a thermo-mineral spring in the Massif Central region of France. This new genus has unique features such as a distinct stria pattern and specialized areolae structures. No evolutionary link or cladistic association with other known genera has been established so far. The habitat of this new genus is characterized by high conductivity and high carbonate concentration.
Article
Plant Sciences
Bart van de Vijver, Tanja M. Schuster, Wolf-Henning Kusber, Bryan Kennedy, Paul B. Hamilton, Raino-Lars Albert, Petra Ballings, Carlos E. Wetzel, Luc Ector
Summary: This paper provides a detailed description of the morphology of European Brachysira serians and the B. brebissonii-intermedia complex, reevaluates the type material, and describes two new species to clarify the taxonomic identity.
