Article
Chemistry, Multidisciplinary
Kechen Zhu, Antony J. Birchill, Angela Milne, Simon Ussher, Matthew P. Humphreys, Nealy Carr, Claire Mahaffey, Maeve C. Lohan, Eric P. Achterberg, Martha Gledhill
Summary: Using a combined ion pairing - organic matter speciation model, this study predicted the organic complexation of iron in the Celtic Sea, optimized through comparison with experimental results and simulated titrations. The results suggest that dissolved organic carbon concentrations in marine waters may not significantly impact the heterogeneity or concentrations of Fe binding sites, with implications for understanding the dissolved Fe inventory in the ocean. The study also calculated Fe solubility under ambient conditions in the Celtic Sea, showing that the interaction between Fe solubility and binding by organic matter plays a key role in controlling the dissolved Fe concentrations in marine environments.
Article
Ecology
Dong Xu, Charlotte-Elisa Schaum, Bin Li, Yanan Chen, Shanying Tong, Fei-Xue Fu, David A. Hutchins, Xiaowen Zhang, Xiao Fan, Wentao Han, Yitao Wang, Naihao Ye
Summary: Elevated pCO(2) levels are predicted to decrease the bio-toxicity of arsenic on marine primary producers, but the response may decrease after long-term adaptation. Diatoms evolved arsenic detoxification strategies under high pCO(2) conditions, resulting in reduced arsenic content in scallops fed with these selected diatoms.
Article
Environmental Sciences
Jiahui Zhong, Yingyan Guo, Zhe Liang, Quanting Huang, Hua Lu, Jinmei Pan, Peiyuan Li, Peng Jin, Jianrong Xia
Summary: The study found that ocean warming has a greater impact on the growth of marine diatom Thalassiosira weissflogii over long-term selection experiments compared to ocean acidification. Many temperature response traits were influenced by ocean warming, indicating that it is the main driver for the evolution of T. weissflogii. However, adaptations resulting from warming can be constrained by ocean acidification, leading to trade-offs in photochemical performances.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Plant Sciences
Glen L. Wheeler, Daniela Sturm, Gerald Langer
Summary: Coccolithophores are abundant calcifying organisms in modern oceans and are important for marine biogeochemistry and the global carbon cycle. Emiliania huxleyi, also known as Gephyrocapsa huxleyi, is the primary model organism for coccolithophore research and has contributed to significant advancements in the field. Other species are also being explored as models for specific aspects of coccolithophore biology.
JOURNAL OF PHYCOLOGY
(2023)
Article
Environmental Sciences
Dong Xu, Shanying Tong, Bingkun Wang, Xiansheng Zhang, Wei Wang, Xiaowen Zhang, Xiao Fan, Yitao Wang, Ke Sun, Naihao Ye
Summary: This study reveals that ocean acidification and warming are major environmental stressors, and the impact of warming on the growth responses of phytoplankton to ocean acidification is not well understood. The results show that high CO2 enhances the growth of Phaeodactylum tricornutum and Thalassiosira weissflogii, especially at optimum temperature. Furthermore, HC-grown cells require more energy and materials to maintain intracellular homeostasis and repair damage caused by unsuitable temperatures.
MARINE POLLUTION BULLETIN
(2022)
Article
Plant Sciences
Haimanti Biswas
Summary: This study investigates the growth response of Arctic diatom Chaetoceros gelidus under varying CO2 and light levels. The results suggest that this species has a high adaptability to variable light levels and is capable of accumulating substantial amounts of organic carbon at low CO2 levels. Additionally, under nitrogen limitation, intracellular nitrogen resources may be recycled, resulting in an increased carbon-to-nitrogen ratio within the cells.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Geochemistry & Geophysics
Wenhan Chen, David B. Kemp, Tianchen He, Robert J. Newton, Yijun Xiong, Hugh C. Jenkyns, Kentaro Izumi, Tenichi Cho, Chunju Huang, Simon W. Poulton
Summary: The period from the late Pliensbachian to early Toarcian experienced significant climatic and environmental changes, including the occurrence of the early Toarcian Oceanic Anoxic Event (T-OAE) and the Pliensbachian-Toarcian boundary event (Pl/To). Current knowledge of seawater redox conditions during this time is mainly based on European sections deposited in restricted basins, limiting our understanding of the redox evolution in the open ocean, particularly Panthalassa. This study presents Fe-speciation and redox-sensitive trace metal data from two Panthalassic Ocean sections, revealing anoxic-ferruginous conditions in the deep-water site and oxygenated to suboxic conditions in the shallow margin site. The observations suggest that upwelling of anoxic-ferruginous waters onto the shelf, driven by increased sea level and prevailing winds, led to Fe2+ oxidation in the oxygenated shallow waters.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Environmental Sciences
Neila Annabi-Trabelsi, Wassim Guermazi, Qusaie Karam, Mohammad Ali, Saif Uddin, Vincent Leignel, Habib Ayadi
Summary: The study found that the concentrations of Cd, Cu, Pb, and Zn in the seawater of Gulf of Gabe`s are significantly higher than in other Mediterranean coastal waters, making it a pollution hotspot. The average metal concentrations show different orders in water and phytoplankton, compared to zooplankton. Additionally, the biomagnification of Zn and Pb is higher in zooplankton, while Cu and Cd are higher in phytoplankton.
MARINE POLLUTION BULLETIN
(2021)
Article
Geosciences, Multidisciplinary
Lavenia Ratnarajah, Stephane Blain, Philip W. Boyd, Marion Fourquez, Ingrid Obernosterer, Alessandro Tagliabue
Summary: The study examined competition for iron between phytoplankton and bacteria in the iron-limited Southern Ocean. Results show that increased iron and light favor phytoplankton dominance, while increased LDOC and decreased light favor bacterial dominance. Bacteria can outcompete phytoplankton for iron under elevated LDOC conditions.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
David W. Crawford, Duncan A. Purdie, Maeve C. Lohan, Peter J. Statham, Tawnya D. Peterson, Hilary A. Kennedy, Michael S. Lipsen, Jennifer N. Putland, Frank A. Whitney
Summary: The offshore Gulf of Alaska is a high-nitrate, low-chlorophyll oceanic region where concentrations of dissolved iron and zinc are low. Previous experiments have shown that iron stimulates phytoplankton biomass and growth, while zinc has minimal effect. This study further confirms the relationship between zinc and pigments and helps explain the low concentrations of alloxanthin observed in this region.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Alessandro Tagliabue, Andrew R. Bowie, Thomas Holmes, Pauline Latour, Pier van der Merwe, Melanie Gault-Ringold, Kathrin Wuttig, Joseph A. Resing
Summary: Hydrothermal iron supply plays an important role in the Southern Ocean carbon cycle. The magnitude of its impact on export production depends on the estimation method used, with inverse helium modelling leading to a significant reduction. However, the observed anomalies and correlation with observations suggest that the spreading rate input scheme is more accurate.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Biodiversity Conservation
Deborah Bozzato, Torsten Jakob, Christian Wilhelm, Scarlett Trimborn
Summary: This study investigated the effects of iron availability on an ecologically relevant diatom in the Southern Ocean, finding that iron-deficient cells exhibited decreased growth rates, oxygen evolution, uptake rates, chlorophyll content, and POC formation. Interestingly, while some parameters were affected by iron deficiency, others such as NPQ and GP:R remained unchanged. Additionally, cellular trace metal quotas highlighted the importance of iron in diatom physiology.
Article
Geochemistry & Geophysics
Kathryn I. Rico, Manuel Schad, Aude Picard, Andreas Kappler, Kurt O. Konhauser, Nagissa Mahmoudi
Summary: Banded Iron Formations (BIFs) have long been thought to be a sedimentary record of seawater trace metal composition, but recent research suggests that much of the trace metals could have come from phytoplankton biomass. This study tested the hypothesis that heterotrophic bacteria degrade the biomass and release the trace metals. The results show that while one type of bacterium can consume carbon substrates in the biomass, there is no evidence that it degrades metalloproteins to liberate trace metals.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Plant Sciences
Jordan A. Facey, Josh J. King, Simon C. Apte, Simon M. Mitrovic
Summary: Micronutrient cobalt plays a key role in cyanobacterial growth, with concentrations below 0.06 μg/L inhibiting growth of Microcystis aeruginosa. Field surveys in South-Eastern Australia showed that sites with low dissolved cobalt concentrations rarely have cyanobacterial blooms, suggesting a potential limitation on growth either alone or in combination with phosphorus.
JOURNAL OF PHYCOLOGY
(2022)
Article
Environmental Sciences
Diksha Sharma, Haimanti Biswas, Saumya Silori, Debasmita Bandyopadhyay, Aziz Ur Rahman Shaik
Summary: This study found that elevated CO2 levels during the summer monsoon season in the southwestern shelf water of India have a positive impact on the growth of certain diatoms and dinoflagellates, but not on other phytoplankton species. This could have significant implications for the food chain and carbon cycling in the region.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2022)
Article
Biochemical Research Methods
Nathan G. Walworth, Mak A. Saito, Michael D. Lee, Matthew R. McIlvin, Dawn M. Moran, Riss M. Kellogg, Fei-Xue Fu, David A. Hutchins, Eric A. Webb
Summary: Ocean microbial communities play a crucial role in sustaining life on Earth, and researchers are using metatranscriptomic and metaproteomic environmental biomarkers to study the factors influencing these communities. By analyzing proteomes and transcriptomes of the cyanobacterium Trichodesmium grown under different nutrient limitations and CO2 concentrations, the study found strong correlations between stress-induced proteins and RNAs, providing valuable insights into the nutrient status under different CO2 conditions. However, there were broader discrepancies in the correlations of transcriptional and translational pathways related to central metabolism. The findings also showed how environmental biomarkers exhibit coherence across multiple omics levels, supporting the potential for studying global responses to environmental stimuli in the ocean.
JOURNAL OF PROTEOME RESEARCH
(2022)
Article
Limnology
Stephanie Anderson, Gayantonia Franze, Joshua D. Kling, Paul Wilburn, Colin T. Kremer, Susanne Menden-Deuer, Elena Litchman, David A. Hutchins, Tatiana A. Rynearson
Summary: The interplay between temperature and nutrient availability can alter the growth and composition of phytoplankton communities, with changes in temperature amplifying or exacerbating the nutrient effect. This has implications for higher trophic levels and carbon flux.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Review
Microbiology
David A. Hutchins, Douglas C. Capone
Summary: This review explores the latest research developments in the marine nitrogen cycle field, highlighting new microbial functional groups, metabolic pathways, original concepts, and analytical capabilities, while emphasizing the impacts of human activities and global change on the marine nitrogen cycle.
NATURE REVIEWS MICROBIOLOGY
(2022)
Article
Environmental Sciences
Ping-Ping Qu, Fei-Xue Fu, Xin-Wei Wang, Joshua D. Kling, Mariam Elghazzawy, Megan Huh, Qian-Qian Zhou, Chunguang Wang, Esther Wing Kwan Mak, Michael D. Lee, Nina Yang, David A. Hutchins
Summary: Through experimental evolution methods, this study found that the N-2-fixing cyanobacteria Trichodesmium and Crocosphaera have different responses to long-term ocean warming. Trichodesmium can rapidly and reversibly acclimate to temperature shifts, while Crocosphaera shows irreversible phenotypic changes and whole-genome adaptation. These different strategies help maintain fitness and stabilize key ocean nitrogen cycle functions under future warming scenarios.
ENVIRONMENTAL MICROBIOLOGY REPORTS
(2022)
Article
Biology
Jia-Zhen Sun, Tifeng Wang, Ruiping Huang, Xiangqi Yi, Di Zhang, John Beardall, David A. Hutchins, Xin Liu, Xuyang Wang, Zichao Deng, Gang Li, Guang Gao, Kunshan Gao
Summary: Sun et al. investigate the effects of current and potential future oxygen levels on phytoplankton growth and photosynthesis. Their results demonstrate positive effects of low oxygen on phytoplankton growth, photosynthesis, and inorganic carbon acquisition.
COMMUNICATIONS BIOLOGY
(2022)
Article
Microbiology
Joshua D. Kling, Eric A. Webb, David A. Hutchins
Summary: Cluster 5 Synechococcus species play a crucial role in biogeochemical processes, but the subcluster 5.2 strains, which inhabit freshwater, estuarine, and marine environments, have been understudied. This study presents the genome of Synechococcus sp. strain LA31, recently isolated from Narragansett Bay, Rhode Island, USA.
MICROBIOLOGY RESOURCE ANNOUNCEMENTS
(2022)
Editorial Material
Multidisciplinary Sciences
David A. Hutchins
Correction
Microbiology
David A. Hutchins, Douglas G. Capone
NATURE REVIEWS MICROBIOLOGY
(2022)
Article
Biodiversity Conservation
Fei-Xue Fu, Bernhard Tschitschko, David A. Hutchins, Michaela E. Larsson, Kirralee G. Baker, Allison McInnes, Tim Kahlke, Arjun Verma, Shauna A. Murray, Martina A. Doblin
Summary: Tropical taxa may be vulnerable to temperature variations due to their relatively stable temperatures, and microbial responses to temperature fluctuations vary depending on their thermal history. This study highlights the divergent effects of temperature fluctuations on microbial growth and metabolism.
GLOBAL CHANGE BIOLOGY
(2022)
Article
Biodiversity Conservation
Lewis Wrightson, Nina Yang, Claire Mahaffey, David A. Hutchins, Alessandro Tagliabue
Summary: Marine nitrogen fixation is an important source of new nitrogen in the ocean, but climate change may affect the ecological niche and physiology of nitrogen-fixing organisms. Warming can increase the nitrogen fixation-specific elemental use efficiency (EUE) of diazotrophs, reducing their nutrient requirements. A new model predicts a global decline in nitrogen fixation in the future, but regional responses are influenced by the thermal performance curves and EUE of diazotrophs.
GLOBAL CHANGE BIOLOGY
(2022)
Article
Ecology
Nina Yang, Yu-An Lin, Carlin A. Merkel, Michelle A. DeMers, Ping-Ping Qu, Eric A. Webb, Fei-Xue Fu, David A. Hutchins
Summary: This study is important for understanding the control of nitrogen-phosphorus-iron co-limitation on nitrogen fixation, as well as its impact on primary productivity and microbial dynamics.
Article
Geosciences, Multidisciplinary
Seth G. John, Rachel L. Kelly, Xiaopeng Bian, Feixue Fu, M. Isabel Smith, Nathan T. Lanning, Hengdi Liang, Benoit Pasquier, Emily A. Seelen, Mark Holzer, Laura Wasylenki, Tim M. Conway, Jessica N. Fitzsimmons, David A. Hutchins, Shun-Chung Yang
Summary: The study investigates the biogeochemical cycle of nickel in the oceans, revealing the distribution characteristics and influencing factors of oceanic nickel through a combination of experiments and simulations.
Article
Limnology
Gayantonia Franze, Stephanie Anderson, Joshua D. Kling, Paul Wilburn, David A. Hutchins, Elena Litchman, Tatiana A. Rynearson, Susanne Menden-Deuer
Summary: Marine microbial communities in coastal environments are influenced by seasonal fluctuations and anthropogenic alterations. The effects of temperature and nutrient availability on phytoplankton growth and ecosystem metabolism are well understood, but the impacts on food web structure and function are not well constrained. This study investigated the interactive effects of temperature and nutrient availability on trophic transfer and found that the interplay of these factors influenced the consumption of primary production. The results suggest that nutrient management will be critical in determining the fate of primary production and ecosystem production in warming oceans.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Review
Biodiversity Conservation
Hai-Bo Jiang, David A. Hutchins, Wentao Ma, Rui-Feng Zhang, Mark Wells, Nianzhi Jiao, Yuntao Wang, Fei Chai
Summary: Marine primary producers have a significant impact on and are influenced by the Earth's climate, with their relationship varying over space and time. Iron plays a crucial role in modulating marine primary productivity, but its dependence changes during different geological periods. This review examines the role of iron in marine primary production during specific geological periods and offers insights into the impact of ocean iron fertilization on carbon sequestration and climate regulation.
GLOBAL CHANGE BIOLOGY
(2023)
Article
Mechanics
Heng Wei, David A. Hutchins, Paul D. Ronney, Niema M. Pahlevan
Summary: This study proposes a growth model based on fluid dynamics to explore the formation and growth of bacterial colonies. The results show that the flow field significantly affects the colony growth rate and shape, with the Reynolds number playing a crucial role in shaping the colonies.
