Laboratory culture experiments to study the effect of lignite humic acid fractions on iron solubility and iron uptake rates in phytoplankton
Hiroshi Hasegawa,Yousuke Tate,Masashi Ogino,Teruya Maki,Zinnat A. Begum,Toshiharu Ichijo,Ismail M.M. Rahman +6 more
Reads0
Chats0
TLDR
In this article, the effect of different humic acid (HA) fractions on the comparative solubility of iron in seawater and the corresponding influence on iron uptake and growth rate of the phytoplankton Prymnesium parvum (Haptophyta) was studied using laboratory cultures.Abstract:
The major fractions of dissolved iron in seawater exist as a complex with organic ligands. A high bioavailability of iron bound to humic acid (HA) compared to the other model ligands, such as desferrioxamine B or ferrichrome, has been reported, which implies the importance of HA to control the geochemical behavior and the transfer of Fe to marine phytoplankton, particularly in estuarine and coastal waters. In the current work, the effect of different HA fractions (>100, 100–30, 30–10, 10–5, and 5–3 kDa), which were extracted from lignite, on the comparative solubility of iron in seawater and the corresponding influence on iron uptake and growth rate of the phytoplankton Prymnesium parvum (Haptophyta) was studied using laboratory cultures. The lower-molecular-weight (MW) HA fractions, such as 30–10, 10–5, and 5–3 kDa, remained soluble in the simulated seawater medium for a longer time span compared to the higher MW fractions. The lower MW fractions facilitated higher iron solubility and assisted in achieving a better phytoplankton growth rate. However, a reciprocal impact on phytoplankton growth rates was observed when the HA concentration increased to a higher range (0.18 to 18 mg-C L−1). The highest intracellular Fe uptake in phytoplankton occurred with 30–10 kDa HA in seawater, and the extracellular dissolved Fe concentrations were higher for smaller-sized HA fractions. In summary, our study showed that the controlled addition of lower MW fractions of HA (up to 30–10 kDa) in estuarine waters could ensure the accelerated uptake of Fe in phytoplankton as well as a better growth rate.read more
Citations
More filters
Journal ArticleDOI
Exploring the potential role of terrestrially derived humic substances in the marine biogeochemistry of iron
TL;DR: A review of available data and information for and against the hypothesis that land-derived humic substances exert a significant control on the marine biogeochemical cycle of iron is presented in this article.
Journal ArticleDOI
Bioaccumulation and biotransformation of arsenic by the brown macroalga Sargassum patens C. Agardh in seawater: effects of phosphate and iron ions
M. Abdullah Al Mamun,M. Abdullah Al Mamun,Yoshiki Omori,Rimana Islam Papry,Chika Kosugi,Osamu Miki,Ismail M.M. Rahman,Asami S. Mashio,Teruya Maki,Hiroshi Hasegawa +9 more
TL;DR: The toxicity and bioaccumulation and biotransformation potential of inorganic arsenic (IAs) species As(V) and As(III) were investigated using Sargassum patens under laboratory culture for 7 days as discussed by the authors.
Journal ArticleDOI
Comparative biotransformation and detoxification potential of arsenic by three macroalgae species in seawater: Evidence from laboratory culture studies.
M. Abdullah Al Mamun,M. Abdullah Al Mamun,Yoshiki Omori,Osamu Miki,Ismail M.M. Rahman,Asami S. Mashio,Teruya Maki,Hiroshi Hasegawa +7 more
TL;DR: It is indicated that P in medium inhibits the intracellular uptake of As(V) and subsequent extrusion of biotransformed metabolites into the medium, which can help to understand the metabolic diversity of macroalgae species on As biogeochemistry in the marine environment.
Journal ArticleDOI
Natural iron fertilization of the coastal ocean by "blackwater rivers".
TL;DR: "blackwater rivers", in sharp contrast to other types of rivers, are excellent sources of bioavailable iron to marine phytoplankton, as can be seen from the visualization of CO2 surface concentrations by NASA which shows the global sources and sinks ofCO2 localized in time and space.
Journal ArticleDOI
Arsenic speciation and biotransformation by the marine macroalga Undaria pinnatifida in seawater: A culture medium study
M. Abdullah Al Mamun,M. Abdullah Al Mamun,Ismail M.M. Rahman,Rakhi Rani Datta,Chika Kosugi,Asami S. Mashio,Teruya Maki,Hiroshi Hasegawa +7 more
TL;DR: The results indicated that the cellular uptake of As (V) and subsequent release of DMAA(V) were inhibited by P in the medium, which can be helpful in understanding the contribution of macroalgae to As biogeochemistry in marine environments and the potential risks of As dietary intake.
References
More filters
Book
HUmus Chemistry Genesis, Composition, Reactions
TL;DR: In this paper, the authors present an analysis of organic matter in soil using NMR Spectroscopy and analytical pyrolysis, showing that organic matter is composed of nitrogen and ammonium.
Journal ArticleDOI
Iron deficiency limits phytoplankton growth in the north-east Pacific subarctic
TL;DR: In this article, the authors reported that the addition of nmol amounts of dissolved iron resulted in the nearly complete utilization of excess NO3, whereas in the controls, without added Fe, only 25% of the available NO3 was used.
Journal ArticleDOI
Preparative isolation of aquatic humic substances.
E. M. Thurman,Ronald L. Malcolm +1 more
TL;DR: The drop impact sampler developed by the Bureau of Mines is based on the stain technique for measuring airborne drops and makes it possible to determine rates of depositions and spatial concentrations.
Journal ArticleDOI
Molecular Structure in Soil Humic Substances: The New View
Rebecca Sutton,Garrison Sposito +1 more
TL;DR: A critical examination of published data obtained primarily from recent nuclear magnetic resonance spectroscopy, X-ray absorption near-edge structure spectroscopic, electrospray ionization-mass spectrometry, and pyrolysis studies reveals an evolving new view of the molecular structure of soil humic substances.
Journal ArticleDOI
Iron uptake and growth limitation in oceanic and coastal phytoplankton
TL;DR: Experiments with coastal and oceanic phytoplankton clones representing different algal groups and cell sizes indicate that cellular iron uptake rates are similar among the species when rates are normalized to cell surface area.