Article
Environmental Sciences
Markel Gomez-Letona, Marta Sebastian, Isabel Banos, Maria Fernanda Montero, Claudia Perez Barrancos, Moritz Baumann, Ulf Riebesell, Javier Aristegui
Summary: Artificial upwelling can increase the concentration of dissolved organic matter (DOM) in the ocean and change its characteristics. More intense treatments result in higher accumulation of dissolved organic carbon and stronger changes in DOM characteristics. Single upwelling pulses lead to higher molecular weight CDOM compared to recurring upwelling modes. Under artificial upwelling, large amounts of DOM may accumulate in the surface ocean without being remineralized in the short-term.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Norbert Kamjunke, Liza-Marie Beckers, Peter Herzsprung, Wolf von Tumpling, Oliver Lechtenfeld, Joerg Tittel, Ute Risse-Buhl, Michael Rode, Alexander Wachholz, Rene Kallies, Tobias Schulze, Martin Krauss, Werner Brack, Sara Comero, Bernd Manfred Gawlik, Hello Skejo, Simona Tavazzi, Giulio Mariani, Dietrich Borchardt, Markus Weitere
Summary: This study investigated autotrophic processes, heterotrophic carbon utilization, and micropollutant concentrations in the River Elbe, Germany, using a Lagrangian sampling design. The results showed that under base flow conditions, there was an increase in phytoplankton biomass and photosynthesis from upstream to downstream, while concentrations of dissolved macronutrients decreased. Bacterial abundance and production increased less than in wetter years, and there were changes in bacterial community composition downstream. DOM components increased due to microbial production, while some pollutants showed higher concentrations downstream. However, their magnitudes were not distinctly different from conditions at medium discharges.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Fred Worrall, Gareth D. Clay, Nicholas J. K. Howden, Tim P. Burt
Summary: The oxidative ratio of the terrestrial biosphere is related to the carbon sink size, which in turn is related to the oxidation state of naturally occurring organic matter. This study proposes using chemical oxygen demand measurements to assess the oxidation state of fluvial organic carbon. Analysis of water quality monitoring data in England reveals the oxidation state of dissolved organic carbon and particulate organic carbon. The inclusion of these estimates in the global oxidative ratio calculation provides a new estimate for the annual flux of CO2 to land.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Environmental Sciences
Harikrishna Prasad Mamidala, Dipnarayan Ganguly, Purvaja Ramachandran, Yudhistir Reddy, Arumughan Paneer Selvam, Gurmeet Singh, Kakolee Banerjee, Radhakrishnan Subhadra Robin, Ramesh Ramachandran
Summary: The distribution and sources of particulate organic carbon and nitrogen in mangroves ecosystems along the east and west coast of India were examined. The results showed that water quality in these mangrove waters is influenced by land-based contaminants and the concentration of particulate organic carbon is higher in the east coast.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Malgorzata Adamczuk
Summary: The concentration of dissolved organic matter (DOM) in aquatic ecosystems has complex effects on plankton, including bacterioplankton, phytoplankton, and metazooplankton. The influence of total DOM on different types of plankton differs significantly based on DOM source and experiment type, highlighting the potential for experimental conditions to produce artifacts in biotic responses to DOM concentrations.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Jaehong Kim, Hyoung Sul La, Jeong-Hoon Kim, Naeun Jo, Junbeom Lee, Bo Kyung Kim, Wuju Son, Kwanwoo Kim, Hyo-Keun Jang, Sanghoon Park, Hyeju Yoo, Jaesoon Kim, Jisoo Park, So Hyun Ahn, Sang Heon Lee
Summary: In this study, we investigated the seasonal variations in organic carbon composition and the relative abundance of each organic carbon in different algal groups in the Ross Sea. The results showed that the compositions of organic carbon were influenced by seasonal variations, physical characteristics, and phytoplankton community structure. Additionally, the environmental changes and phytoplankton community structures in the Ross Sea due to climate change could affect the organic carbon pool, which could determine the efficiency of the biological pump.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Biology
Kangli Guo, Jie Chen, Jian Yuan, Xiaodong Wang, Shuaishuai Xu, Shengwei Hou, Yan Wang
Summary: This study analyzed the effects of temperature on carbon allocation in phytoplankton and the significance of TEP in the marine carbon pool. The results showed that increased temperature promotes DOC exudation and extracellular TEP formation, affecting carbon pool allocation in phytoplankton cells.
Article
Microbiology
Anabel von Jackowski, Kevin W. Becker, Matthias Wietz, Christina Bienhold, Birthe Zancker, Eva-Maria Noethig, Anja Engel
Summary: The seasonal variations in biopolymers, microbial abundance, and microbial composition in the upper 100 meters of the Fram Strait were investigated during summer and fall. The study found a shift in the autotrophic community from picoeukaryotes dominating in summer to an increase of Synechococcus by fall. Additionally, a decline in biopolymers concentrations was observed along with increasing microbial diversity and a community shift towards fewer polymer-degrading genera in fall.
ENVIRONMENTAL MICROBIOLOGY
(2022)
Article
Ecology
Bryanna A. H. Sherbo, Joseph Tonin, Michael J. Paterson, Brenda J. Hann, Julia Kozak, Scott N. Higgins
Summary: This study examined the effects of increasing dissolved organic matter (DOM) on phytoplankton biomass and productivity in boreal lakes. The results showed that the increase in DOM led to a decline in phytoplankton biomass and productivity, as well as changes in the physical, chemical, and biological properties of the lakes.
FRESHWATER BIOLOGY
(2023)
Article
Ecology
Hyungseok Kim, Jeffrey A. Kimbrel, Christopher A. Vaiana, Jessica R. Wollard, Xavier Mayali, Cullen R. Buie
Summary: Photosynthetic microalgae are important for fixing CO2 and have potential as a renewable bioenergy source. By studying the metabolic interactions between microorganisms, this research explores the factors influencing community development. The novel system provides a useful tool for investigating metabolic interactions between microbes in aquatic ecosystems.
Article
Environmental Sciences
Saumya Silori, Haimanti Biswas, Mintu Chowdhury, Diksha Sharma, Mandeng-Yogo Magloire, Damien Cardinal
Summary: The study reveals the factors responsible for spatial and interannual variability in particulate organic matter (POM) and 813CPOC values in the western Indian Shelf waters. The dominance of upwelling in the south leads to higher phytoplankton biomass and POM values, while low nutrient warm waters prevail in the north.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Limnology
Michael L. Pace, Cal D. Buelo, Stephen R. Carpenter
Summary: Lake respiration is supported by a combination of autochthonous and allochthonous resources, with temperature and organic matter inputs influencing the process. However, the variability in daily inputs can lead to fluctuations in respiration rates, with nutrients not directly tracking phytoplankton blooms in the lakes. Changes in hydrologic, climatic, and land use factors may result in linear responses in ecosystem processes like respiration.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Article
Multidisciplinary Sciences
Xavier Mayali, Ty J. Samo, Jeff A. Kimbrel, Megan M. Morris, Kristina Rolison, Courtney Swink, Christina Ramon, Young-Mo Kim, Nathalie Munoz-Munoz, Carrie Nicora, Sam Purvine, Mary Lipton, Rhona K. Stuart, Peter K. Weber
Summary: This study quantified carbon and nitrogen incorporation in bacterial co-cultures growing with diatom at the single-cell level. Unexpected strain and cell variability were observed, and three distinct functional guilds were identified.
NATURE COMMUNICATIONS
(2023)
Article
Environmental Sciences
Federico Baltar, Xose A. Alvarez-Salgado, Javier Aristegui, Ronald Benner, Dennis A. Hansell, Gerhard J. Herndl, Christian Lonborg
Summary: The text discusses the transformation and sequestration of organic carbon produced in the sunlit surface ocean into the ocean's interior, focusing on the refractory dissolved organic carbon (rDOC). It emphasizes the importance of defining rDOC operationally and highlights the various factors influencing its persistence, including intrinsic and extrinsic properties. The text also suggests specific research questions aimed at stimulating further research on the nature, dynamics, and role of rDOC in carbon sequestration under future scenarios of climate change.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Ecology
Mario Uchimiya, William Schroer, Malin Olofsson, Arthur S. Edison, Mary Ann Moran
Summary: Organic carbon transfer between surface ocean photosynthetic and heterotrophic microbes is a complex process influenced by diurnal cycles, as shown in a model community study revealing changes in diatom endometabolome and bacterial uptake transcriptome. Understanding the factors influencing metabolite release and consumption by surface ocean microbes is crucial for better constraining this globally significant carbon flux. Improved model performance was observed when active release mechanisms were incorporated, suggesting the importance of physiological balance and bacterial recognition in this process.