Article
Engineering, Marine
Marin Ordulj, Danijela Santic, Frano Matic, Slaven Jozic, Stefanija Sestanovic, Mladen Solic, Jere Veza, Zivana Nincevic Gladan
Summary: Artificial neural network analysis was used to study the seasonal distribution of viruses and microbial food web (MFW) components in the open Adriatic Sea. The results showed that the strongest influence is found in the nonlinear relationship between viruses and temperature. Viruses were found to have a strong positive relationship with HB, the main hosts, in more than 50% of the observed data, and were associated with autotrophic picoplankton and heterotrophic nanoflagellates.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Environmental Sciences
Ananya Ashok, Susana Agusti
Summary: Oligotrophic areas in the oceans are important, but little is known about the sensitivity of microbial communities to pollutants in such areas. This study found that when exposed to polycyclic aromatic hydrocarbons (PAHs), some microbial populations in the oligotrophic Red Sea decreased, and chlorophyll-a levels also decreased substantially. However, certain bacteria and Synechococcus sp. showed high tolerance, indicating adaptation to chronic pollution.
Article
Environmental Sciences
Xiaodong Wang, Shanshan Chen, Xuejun Bi, Ning Chen, Tang Yang, Ling Wang, Zakhar Maletskyi, Harsha Ratnaweera
Summary: This study investigates the biofilm evolution in a pilot-scale MBBR system and measures the quantity of active heterotrophic and autotrophic biomass. The thickness and morphological data of the biofilm evolution were obtained through quantitative image analysis. Regression models based on the morphological data provided satisfactory prediction accuracy. This research provides important information for understanding the biofilm evolution in MBBRs.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
R. Fuchs, V. Rossi, C. Caille, N. Bensoussan, C. Pinazo, O. Grosso, M. Thyssen
Summary: This study investigates the response of picophytoplankton and nanophytoplankton to upwelling events caused by sporadic wind gusts. The events generate nutrient pulses and temperature drops in the coastal area, leading to delayed increases in abundance and biomass of the phytoplankton groups. However, there is an overall decrease following the increase.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Tal Amit, Raz Moskovich, Yuval Jacobi, Sandra E. Shumway, J. Evan Ward, Peter Beninger, Gitai Yahel, Yossi Loya
Summary: This study conducted in situ experiments and found that bivalves have higher capture efficiency than previously believed. They can capture micron and submicron autotrophic cells, indicating a wider trophic niche in diverse habitats.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Najwa Al-Otaibi, Francisca C. Garcia, Xose Anxelu G. Moran
Summary: The study found that autotrophic picoplankton groups generally had faster growth rates, while heterotrophic prokaryotes had slower growth rates. Different populations exhibited different growth characteristics in different seasons, such as Prochlorococcus showing the highest growth rates in winter, while Synechococcus had faster growth rates in spring.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Forestry
Lu Yang, Jianghuan Qin, Yan Geng, Chunyu Zhang, Junxiao Pan, Shuli Niu, Dashuan Tian, Xiuhai Zhao, Jinsong Wang
Summary: This study found that heavy thinning significantly reduced soil respiration by decreasing both heterotrophic respiration and autotrophic respiration. Thinning also increased the temperature sensitivity of heterotrophic respiration, while decreasing the temperature sensitivity of autotrophic respiration. Soil moisture had a positive relationship with heterotrophic respiration but did not have a significant correlation with autotrophic respiration, except in the case of moderate thinning. Two-factor models integrating soil temperature and soil moisture explained a substantial variation in heterotrophic respiration and a smaller variation in autotrophic respiration. The effects of thinning on soil respiration and its components varied over time. The findings highlight the importance of considering fine root and microbial biomass in biogeochemical models when predicting the long-term effects of thinning on soil respiration and its components.
FOREST ECOLOGY AND MANAGEMENT
(2022)
Article
Mathematics, Applied
H. Awada, S. Aronica, A. Bonanno, G. Basilone, S. W. Zgozi, G. Giacalone, I. Fontana, S. Genovese, R. Ferreri, S. Mazzola, B. Spagnolo, D. Valenti, G. Denaro
Summary: The study proposed a 3D model that successfully simulated the spatial distribution of chlorophyll in most parts of the Gulf of Sirte, with 80% of the simulated results matching the experimental data. This model can be used to predict chlorophyll distributions in hard-to-access areas and to forecast the impact of global warming on phytoplankton in marine ecosystems.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2021)
Article
Geosciences, Multidisciplinary
Tanu Kumari, Rishikesh Singh, Pramit Verma, Akhilesh Singh Raghubanshi
Summary: Soil respiration is influenced by a variety of factors including vegetation density, monsoon phases, and microbial and root biomass. Heterotrophic respiration is the major contributor to soil respiration in medium to high-density vegetation, while autotrophic respiration dominates in low-density vegetation during certain monsoon phases. The partitioning of root biomass plays a crucial role in regulating the components of soil respiration.
Article
Ecology
Aida Martinez-Lopez, Cristian Hakspiel-Segura, Carlos J. Robinson, Jaime Gomez-Gutierrez
Summary: This study quantitatively compared the composition and distribution of picoplankton in the Gulf of California central region, specifically the Midriff islands Archipelago, in February 2014. Heterotrophic bacteria dominated the picoplankton community, followed by Synechococcus, Prochlorococcus, picoeukaryotes, and phycoerythrin-containing eukaryotes. Temperature was found to drive the abundances of Prochlorococcus and picoeukaryotes, while picoeukaryotes were related to sigma-Theta and Synechococcus to dissolved oxygen concentration. The study highlights the importance of understanding the spatial dynamics of picoplankton and their biomass in different oceanographic regions.
REGIONAL STUDIES IN MARINE SCIENCE
(2023)
Article
Biology
E. S. Krasnova, M. Umanskaya
Summary: The study revealed that the picoseston in the Saratov Reservoir is dominated by single heterotrophic bacteria and phototrophic picocyanobacteria, with a very small proportion of picodetrital particles. There were differences in abundance and biomass among different stations, but overall productivity levels corresponded to mesotrophic levels.
Article
Limnology
John Paul Balmonte, Meinhard Simon, Helge-Ansgar Giebel, Carol Arnosti
Summary: This study measured the enzymatic activities of marine microbes in the deep ocean and found different patterns of enzyme activities at different depths and latitudes, which may be related to biotic and abiotic factors.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Article
Biodiversity Conservation
Yue Du, Ying-Ping Wang, Dafeng Hui, Fanglong Su, Junhua Yan
Summary: Global warming affects the hydrological cycle and precipitation patterns, potentially impacting soil respiration. While the effects of precipitation amount on soil respiration have been extensively studied, there is little consensus on the effects of precipitation frequency. A meta-analysis of field observations from 296 published papers showed that the effects of precipitation frequency on soil respiration decrease with increasing annual precipitation. Increased precipitation frequency has positive effects on soil respiration under arid conditions, while decreased precipitation frequency suppresses soil respiration across all climate conditions.
GLOBAL CHANGE BIOLOGY
(2022)
Article
Biology
Yuval Kolodny, Yoav Avrahami, Hagit Zer, Miguel J. Frada, Yossi Paltiel, Nir Keren
Summary: Cyanobacteria of the genus Synechococcus play a key role in marine ecosystems, and their photo-acclimation strategy allows them to efficiently carry out photosynthesis at different depths in the water column.
COMMUNICATIONS BIOLOGY
(2022)
Article
Ecology
Valeria Di Biagio, Stefano Salon, Laura Feudale, Gianpiero Cossarini
Summary: This study investigates the subsurface oxygen maximum (SOM) in the Mediterranean Sea, showing different characteristics between the western and eastern Mediterranean in summer. The model-derived concentrations and depths are in agreement with estimations from the literature and display mesoscale variability patterns.
Article
Environmental Sciences
Pablo Alba-Gonzalez, Xose Anton Alvarez-Salgado, Antonio Cobelo-Garcia, Joeri Kaal, Eva Teira
Summary: The chemical composition of the seawater soluble fraction (WSF) of yellow-legged gulls and harbour seal faeces and their impact on microbial plankton communities from an eutrophic coastal area have been tested. After characterisation of the C:N:P stoichiometry, trace metals content and organic molecular composition of the faeces, significant differences between species have been observed in all parameters. The study found that seagull faeces had higher N content and were more soluble in seawater than seal faeces, leading to a greater impact on phytoplankton populations.
MARINE ENVIRONMENTAL RESEARCH
(2022)
Article
Microbiology
Mohd Ikram Ansari, Maria Li Calleja, Luis Silva, Miguel Viegas, David Kamanda Ngugi, Tamara Megan Huete-Stauffer, Xose Anxelu G. Moran
Summary: Autotrophic and heterotrophic bacterioplankton play essential roles in the biogeochemistry of tropical ecosystems. This study provides a high-frequency assessment of bacterial community dynamics and the associated environmental factors in Red Sea coastal waters. The results reveal the importance of temperature, chlorophyll-a, and dissolved organic carbon concentration in shaping bacterial abundance and diversity patterns.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Microbiology
Elisa Calvo-Martin, Eva Teira, Xose Anton Alvarez-Salgado, Carlos Rocha, Shan Jiang, Maider Justel-Diez, Juan Severino Pino Ibanhez
Summary: This study explores the microbial ecology of two neighboring but contrasting subterranean estuaries, revealing their microbial composition, abundance, heterotrophic production, and their geochemical drivers. The results show that different subterranean estuaries have different microbial community characteristics, which are closely related to the biogeochemical processes in these estuaries.
ENVIRONMENTAL MICROBIOLOGY
(2022)
Article
Ecology
Benjamin Pontiller, Sandra Martinez-Garcia, Vanessa Joglar, Dennis Amnebrink, Clara Perez-Martinez, Jose M. Gonzalez, Daniel Lundin, Emilio Fernandez, Eva Teira, Jarone Pinhassi
Summary: Coastal upwelling zones are important areas of oceanic productivity. Bacteria play a vital role in the remineralization of dissolved organic matter (DOM) produced by phytoplankton, but the molecular processes involved in the regulation of phytoplankton-derived DOM turnover by bacterial taxa are not well understood. This study used metatranscriptome analysis to compare the gene expression of bacterioplankton in the Northwest Iberian upwelling system. The results showed that different bacterial taxa had specific transcriptional responses during different phases of phytoplankton bloom development, decay, and senescence. The study also highlighted the importance of gene systems involved in the degradation and uptake of carbohydrates and nitrogen-rich compounds in shaping the fate of organic matter in these upwelling-driven ecosystems.
Review
Oceanography
Markel Gomez-Letona, Javier Aristegui, Nauzet Hernandez-Hernandez, Xose Anton Alvarez-Salgado, Marta Alvarez, Erick Delgadillo, Maria Perez-Lorenzo, Eva Teira, Santiago Hernandez-Leon
Summary: Organic matter influences the composition and metabolism of marine prokaryotes. This study investigates the relationship between fluorescent dissolved organic matter and prokaryotic community composition in the deep ocean. The results show that water mass mixing, oxygen utilization, and productivity proxies are important factors explaining the distribution of different fluorescence components. The diversity and taxonomic composition of prokaryotic communities are found to vary between water masses, suggesting a link between community composition, oxygen utilization, and fluorescent dissolved organic matter.
PROGRESS IN OCEANOGRAPHY
(2022)
Article
Environmental Sciences
Nestor Arandia-Gorostidi, Anders K. Krabberod, Ramiro Logares, Ina Maria Deutschmann, Renate Scharek, Xose Anxelu G. Moran, Felipe Gonzalez, Laura Alonso-Saez
Summary: This study used network analysis to investigate the specific associations between phytoplankton and bacteria, revealing that phytoplankton dynamics may be a strong driver of inter-annual variability in bacterial community composition. Additionally, there were tighter associations between free-living bacteria and phytoplankton compared to particle-attached bacteria.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Limnology
Markel Gomez-Letona, Javier Aristegui, Nauzet Hernandez-Hernandez, Maria Perez-Lorenzo, Xose Anton Alvarez-Salgado, Eva Teira, Marta Sebastian
Summary: This study investigates the vertical connectivity between surface productivity regimes and deep ocean prokaryotic communities. The results show that higher prokaryotic abundances and viabilities, as well as smaller cell sizes, are observed below highly productive surface waters. However, leucine uptake rates in deep waters do not show a clear relationship with surface productivity.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Ecology
Cecilia Costas-Selas, Sandra Martinez-Garcia, Ramiro Logares, Marta Hernandez-Ruiz, Eva Teira
Summary: This study provides the first detailed description of the seasonal patterns in bacterial community composition (BCC) in shelf waters off the Ria de Vigo (Spain). The study also reveals strong correlations between BCC and small-sized eukaryotic community composition (ECC), suggesting the importance of biotic interactions in structuring the microbial plankton in this productive area.
Article
Environmental Sciences
Xose Anxelu G. Moran, Nestor Arandia-Gorostidi, Tamara Megan Huete-Stauffer, Laura Alonso-Saez
Summary: This study explores the impact of temperature on the functional diversity of dissolved organic matter (DOM) utilization. The results show that temperature not only affects the rate of carbon utilization, but also alters the diversity of substrates utilized. Additionally, the study finds a positive correlation between seawater temperature and the number of substrates utilized, with functional richness increasing as temperature rises and reaching a peak at 16 degrees C.
ENVIRONMENTAL MICROBIOLOGY REPORTS
(2023)
Article
Microbiology
Abbrar Labban, Ahmed A. Shibl, Maria Ll. Calleja, Pei-Ying Hong, Xose Anxelu G. Moran
Summary: This study investigated the growth and gene expression changes of a Prochlorococcus strain from the Red Sea under different temperatures. The results showed that the growth rate and cell size of the Prochlorococcus increased significantly with temperature. However, at 30 degrees C, genes involved in carbon fixation and photosynthetic electron transport were downregulated, indicating a temperature response mechanism. The study suggests that Prochlorococcus can modulate its gene expression to adapt to lower temperatures but is unable to cope with temperatures exceeding 30 degrees C.
ENVIRONMENTAL MICROBIOLOGY
(2023)
Article
Environmental Sciences
Xuerong Sun, Robert J. W. Brewin, Shubha Sathyendranath, Giorgio Dall'Olmo, Ruth Airs, Ray Barlow, Astrid Bracher, Vanda Brotas, Malika Kheireddine, Tarron Lamont, Emilio Maranon, Xose Anxelu G. Moran, Dionysios E. Raitsos, Fang Shen, Gavin H. Tilstone
Summary: Understanding the response of phytoplankton to climate change is crucial, and satellite remote sensing of ocean colour is the only means of monitoring phytoplankton at large scales. However, addressing ambiguity in ocean colour signal is necessary for developing algorithms for climate change studies. Enriching ocean colour data with sea surface temperature information can help tackle this issue.
REMOTE SENSING OF ENVIRONMENT
(2023)
Article
Environmental Sciences
Christian Lonborg, Federico Baltar, Maria Li Calleja, Xose Anxelu G. Moran
Summary: Temperature and substrate availability are important variables controlling marine heterotrophic bacterial activity. This study shows that site-specific ecosystem differences may override general responses to temperature and substrate in tropical coastal waters.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2022)
Article
Microbiology
Maider Justel-Diez, Erick Delgadillo-Nuno, Alberto Gutierrez-Barral, Paula Garcia-Otero, Isaac Alonso-Barciela, Pablo Pereira-Villanueva, Xose Anton Alvarez-Salgado, Alberto Velando, Eva Teira, Emilio Fernandez
Summary: This study investigated the role of seabird guano in marine ecosystem functioning by adding different concentrations of gull guano to microbial communities collected from coastal waters in NW Spain. Results showed that guano stimulated the growth of certain bacteria and diatoms, and increased chlorophyll a concentration. The study also revealed that guano altered the phytoplankton-bacteria interaction from neutral to positive in low-nutrient environments, but from positive to neutral in high-nutrient environments.
ENVIRONMENTAL MICROBIOLOGY
(2023)
Article
Genetics & Heredity
Tamara Megan Huete-Stauffer, Ramiro Logares, Mohd Ikram Ansari, Anders Rostad, Maria Lluch Calleja, Xose Anxelu G. Moran
Summary: We found variability in physico-chemical variables in the mesopelagic layer, with distinct seasonal indicator prokaryotes inhabiting the DSL. The deep scattering layer (DSL) contributes uniquely and in a high proportion to the diversity of the Red Sea mesopelagic.
ENVIRONMENTAL MICROBIOME
(2023)
Article
Marine & Freshwater Biology
A. Gutierrez-Barral, E. Fernandez, M. Hernandez-Ruiz, E. Teira
Summary: Increasing nutrient inputs driven by global environmental pressures may lead to changes in prokaryotic plankton biomass and community composition in coastal environments. Nutrient addition experiments were conducted outside the Ria de Vigo in different seasons, and the results were compared with similar previous experiments conducted inside the ria. The addition of mixed nutrients caused the greatest changes in community composition, while inorganic nutrients led to increased proportions of certain bacterial orders. The resistance of prokaryotic communities to nutrient additions varied depending on the type of nutrient and location.