A5074347854- Marine and coastal ecosystems
- Marine Biology and Ecology Research
- Microbial Community Ecology and Physiology
- Environmental Toxicology and Ecotoxicology
- Ocean Acidification Effects and Responses
- Algal biology and biofuel production
- Isotope Analysis in Ecology
- Heavy metals in environment
- Photosynthetic Processes and Mechanisms
- Aquatic Ecosystems and Phytoplankton Dynamics
- Wastewater Treatment and Nitrogen Removal
- Toxic Organic Pollutants Impact
- Marine Bivalve and Aquaculture Studies
- Mercury impact and mitigation studies
- Microplastics and Plastic Pollution
- Methane Hydrates and Related Phenomena
- Trace Elements in Health
- Geochemistry and Elemental Analysis
- Congenital Anomalies and Fetal Surgery
- Parasitic Infections and Diagnostics
- Parasitic infections in humans and animals
- Pharmaceutical and Antibiotic Environmental Impacts
- Chromium effects and bioremediation
- Microbial Fuel Cells and Bioremediation
- Biological Control of Invasive Species
Xiamen University
2016-2025
Capital Medical University
2025
Beijing Tongren Hospital
2025
Qinghai University Affiliated Hospital
2022-2024
Bigelow Laboratory for Ocean Sciences
2024
GEOMAR Helmholtz Centre for Ocean Research Kiel
2024
Woods Hole Oceanographic Institution
2024
Qinghai University
2022
Lanzhou University
2018
Institute of Oceanology
2017
Ironed Out In large regions of the ocean, low levels essential nutrient, iron, limits primary productivity. Iron's chemistry and bioavailability are highly dependent on pH. Rising concentrations atmospheric CO 2 is leading to acidification ocean. Shi et al. (p. 676 , published online 14 January; see Perspective by Sunda ) show that bioavailable fraction iron dissolved in ocean may decline as a result decrease pH, which affects rate uptake diatoms coccolithophores. Unless input oceans...
Nitrogen fixation is critical for the biological productivity of ocean, but clear mechanistic controls on this process remain elusive. Here, we investigate abundance, activity, and drivers nitrogen-fixing diazotrophs across tropical western North Pacific. We find a basin-scale coherence diazotroph abundances N2 rates with supply ratio iron:nitrogen to upper ocean. Across threshold increasing ratios, abundance nifH genes increased, phosphate concentrations decreased, bioassay experiments...
Abstract. The control of key chemical parameters in phytoplankton cultures, such as pCO2, pH and Ω (the saturation state calcium carbonate), is made difficult by the interdependence these changes resulting from growth organisms, CO2 fixation, nutrient uptake and, for coccolithophores, calcite precipitation. Even cultures where pCO2 or maintained constant, other change substantially at high cell densities. Experimentally we observed that various methods adjustment pCO2/pH – acid base...
Dissolution of anthropogenic CO 2 increases the partial pressure ( p ) and decreases pH seawater. The rate Fe uptake by dominant N -fixing cyanobacterium Trichodesmium declines as in metal-buffered medium. slower Fe-uptake at low results from changes chemistry not a physiological response organism. Contrary to previous observations nutrient-replete media, increasing /decreasing causes decrease rates fixation growth under low-Fe conditions. This result was obtained even though bioavailability...
Acidification of seawater caused by anthropogenic carbon dioxide (CO2) is anticipated to influence the growth dinitrogen (N2)-fixing phytoplankton, which contribute a large fraction primary production in tropical and subtropical ocean. We found that N2-fixation ubiquitous cyanobacterium Trichodesmium decreased under acidified conditions, notwithstanding beneficial effect high CO2 resulted low cytosolic pH reduced rates despite elevated nitrogenase concentrations. Low required increased...
Phytoplankton assimilation and microbial oxidation of ammonium are two critical conversion pathways in the marine nitrogen cycle. The underlying regulatory mechanisms these competing processes remain unclear. Here we show that ambient nitrate acts as a key variable to bifurcate flow through or oxidation, depth nitracline represents robust spatial boundary between assimilators oxidizers stratified ocean. Profiles utilization phytoplankton assemblages nitrate-depleted regimes have higher...
Abstract Subtropical gyres cover 26%–29% of the world's surface ocean and are conventionally regarded as deserts due to their permanent stratification, depleted nutrients, low biological productivity. Despite tremendous advances over past three decades, particularly through Hawaii Ocean Time‐series Bermuda Atlantic Study, which have revolutionized our understanding biogeochemistry in oligotrophic marine ecosystems, remain understudied. We review current upper North Pacific Gyre, considering...
Abstract. Marine diazotrophs convert dinitrogen (N2) gas into bioavailable nitrogen (N), supporting life in the global ocean. In 2012, first version of oceanic diazotroph database (version 1) was published. Here, we present an updated 2), significantly increasing number situ diazotrophic measurements from 13 565 to 55 286. Data points for N2 fixation rates, cell abundance, and nifH gene copy abundance have increased by 184 %, 86 809 respectively. Version 2 includes two new data sheets...
Abstract Iron (Fe) and phosphorus (P) availability constrain the growth N 2 fixation of diazotrophic cyanobacteria in global ocean. However, how Fe P limitation may modulate effects ocean acidification on unicellular cyanobacterium Crocosphaera remains largely unknown. Here, we examined physiological responses watsonii WH8501 to CO enrichment under both nutrient‐replete steadily Fe‐ or P‐limited conditions. Increased (750 μ atm vs. 400 atm) reduced rates , with intensifying negative effect,...
In natural samples from the New Jersey coast and Gulf of Alaska, zinc (Zn) cadmium (Cd) uptake rates by phytoplankton decreased on average about 30% as pH was 8.5 to 7.9 or 7.7, partial pressure carbon dioxide (PCO 2 ) increased accordingly. The underlying mechanism explored with model species, Thalassiosira weissflogii Emiliania huxleyi , using ethylenediaminetetraacetic acid (EDTA), desferrioxamine B, phytochelatin, cysteine complexing agents. Experiments single agents did not reproduce...
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 66:211-222 (2012) - DOI: https://doi.org/10.3354/ame01576 FEATURE ARTICLEEffect of ocean acidification on cyanobacteria in subtropical North Atlantic M. W. Lomas1,*, B. Hopkinson2,3,**, J. L. Losh2,** D. E. Ryan2,**, Shi2,4,**, Y. Xu2,**, F. Morel2 1Bermuda Institute Ocean Sciences, St. George’s GE01, Bermuda 2Department...
Abstract Nutrients limiting phytoplankton growth in the ocean are a critical control on productivity and can underpin predicted responses to climate change. The extensive western subtropical North Pacific is assumed be under strong nitrogen limitation, but this not well supported by experimental evidence. Here, we report results of 14 factorial nitrogen–phosphorus–iron addition experiments through Philippine Sea, which demonstrate gradient from limitation north nitrogen–iron co‐limitation...
In the high‐nutrient, low‐chlorophyll waters of Gulf Alaska, microcosm manipulation experiments were used to assess effect CO 2 on growth and primary production under iron‐limited iron‐replete conditions. As expected, iron had a strong photosynthesis. A modest variable stimulation biomass by (high : 77–122 Pa; low 11‐17 Pa) was observed both conditions, though near limit precision our measurements in slow‐growing low‐iron experiments. Physiological acclimations responsible for changes...
Abstract Due to the ongoing effects of climate change, phytoplankton are likely experience enhanced irradiance, more reduced nitrogen, and increased water acidity in future ocean. Here, we used Thalassiosira pseudonana as a model organism examine how adjust energy production expenditure cope with these multiple, interrelated environmental factors. Following acclimation matrix nitrogen source, CO 2 levels, diatom's expenditures were quantified incorporated into an energetic budget predict...
Abstract. Dinitrogen fixation (NF) by marine cyanobacteria is an important pathway to replenish the oceanic bioavailable nitrogen inventory. Light key modulating NF; however, field studies investigating light response curve (NF-I curve) of NF rate and effect on diazotroph-derived (DDN) net release are relatively sparse in literature, hampering prediction using models. A dissolution method was applied uncontaminated 15N2 gas examine how changes may influence intensity DDN oligotrophic ocean....
Abstract Nitrogen (N), as a critical element for microbial metabolisms, recycles rapidly in the euphotic ocean. Oxidation by nitrifiers is competing pathway phytoplankton assimilation of regenerated N (NH 4 + and urea). Sharing overlapping substrates may result competitive exclusion, thus, niche separation two assemblages. Both pathways are sensitive to light, but whether light intensity will intensify or alleviate such resource competition zone remains poorly explored field at community...
Although increasing the p CO 2 for diatoms will presumably down‐regulate ‐concentrating mechanism ( CCM ) to save energy growth, different species have been reported respond differently ocean acidification OA ). To better understand their growth responses , we acclimated Thalassiosira pseudonana Phaeodactylum tricornutum and Chaetoceros muelleri ambient 400 μatm, pH 8.1), carbonated 800 acidified 7.8), 7.8) conditions investigated how seawater affect s, photosynthesis, respiration both...
Abstract The N 2 fixation and primary production rates were measured simultaneously using 15 13 C incubation assays in the northern South China Sea influenced by Kuroshio intrusion (KI) seasonally. degree of KI (KI index, range from 0 to 1) was assessed applying an isopycnal mixing model. water column integrated for stations with index larger than 0.5 463 ± 260 μmol N·m −2 ·day −1 62 19 mmol C·m , respectively, significantly higher those lower (50 10 28 respectively). Trichodesmium dominant...
Abstract Growth of the prominent nitrogen-fixing cyanobacterium Trichodesmium is often limited by phosphorus availability in ocean. How nitrogen fixation phosphorus-limited may respond to ocean acidification remains poorly understood. Here, we use phosphate-limited chemostat experiments show that enhanced demands and decreased phosphorus-specific rates . The increased requirements were attributed primarily elevated cellular polyphosphate contents, likely for maintaining cytosolic pH...
Abstract In regions of the nitrogen limited low latitude ocean, phosphate can also be depleted to levels initiating stress responses in marine microbes. Here, we associate a broad region depletion subtropical North Pacific with different phosphorus stress. Nutrient and aerosol addition experiments demonstrated primary limitation bulk phytoplankton community, supply aerosols relieving this limitation. At northern sites phosphate, alkaline phosphatase activities were enhanced, indicating...
The marine clams Mactra veneriformis were collected from three different locations in a contaminated bay Northern China. Another species of Ruditapes philippinarum was the same as well relatively clean site Hong Kong. indices Cd and Zn bioaccumulation (assimilation efficiency, dissolved uptake rate, efflux rate), tissue concentration, subcellular distribution, metallothionein (MT) content, clearance rate subsequently quantified these populations laboratory. In two clams, population with...
Abstract The response of the prominent marine dinitrogen (N 2 )-fixing cyanobacteria Trichodesmium to ocean acidification (OA) is critical understanding future oceanic biogeochemical cycles. Recent studies have reported conflicting findings on effect OA growth and N fixation . Here, we quantitatively analyzed experimental data how reallocated intracellular iron energy among key cellular processes in OA, integrated construct an optimality-based model. model results indicate that rate...
Abstract In the context of continuously increasing anthropogenic nitrogen inputs, knowledge how ammonia oxidation (AO) in ocean responds to warming is crucial predicting future changes marine biogeochemistry. Here, we show divergent thermal response patterns for AO across a wide onshore/offshore trophic gradient. We find oxidizer community and ambient substrate co-regulate optimum temperatures (T opt ), generating distinct with T varying from ≤14 °C ≥34 °C. Substrate addition elevates when...