A5037042410- Marine and coastal ecosystems
- Atmospheric chemistry and aerosols
- Microbial Community Ecology and Physiology
- Odor and Emission Control Technologies
- Atmospheric and Environmental Gas Dynamics
- Marine Biology and Ecology Research
- Methane Hydrates and Related Phenomena
- Marine Bivalve and Aquaculture Studies
- Isotope Analysis in Ecology
- Wastewater Treatment and Nitrogen Removal
- Water Treatment and Disinfection
- Toxic Organic Pollutants Impact
- Oceanographic and Atmospheric Processes
- Microplastics and Plastic Pollution
- Per- and polyfluoroalkyl substances research
- Air Quality Monitoring and Forecasting
- Atmospheric Ozone and Climate
Consejo Nacional de Investigaciones Científicas y Técnicas
2024
Instituto Nacional de Investigacion y Desarrollo Pesquero
2024
University of Southern Mississippi
2020
University of Hawaiʻi at Mānoa
2015-2018
University of Hawaii System
2010-2016
University of South Alabama
2004-2010
Dauphin Island Sea Lab
2006-2010
Summary Microbial consumption is one of the main processes, along with photolysis and ventilation, that remove biogenic trace gas dimethylsulfide (DMS) from surface ocean. Although a few isolates marine bacteria have been studied for their ability to utilize DMS, little known about characteristics or phylogenetic affiliation DMS consumers in seawater. We enriched coastal open‐ocean waters different carbon sources stimulate bacterial communities (glucose‐consuming bacteria, methyl...
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 73:93-105 (2014) - DOI: https://doi.org/10.3354/ame01714 FEATURE ARTICLE Aerobic production of methane from dissolved water-column methylphosphonate and sinking particles in North Pacific Subtropical Gyre Daniela A. del Valle*, David M. Karl Daniel K. Inouye Center for Oceanography: Research Education, University Hawaii,...
We studied the biological consumption of dimethylsulfide (DMS) and its role in controlling DMS concentrations Ross Sea, Antarctica, during spring (Nov) summer (Jan) 2005. Surface concentrations, measured with a technique that minimized release from Phaeocystis antarctica , increased rapidly 0.3 nmol L −1 to 67.7 paralleling increases chlorophyll bacterial biomass production. Biological (BDMSC) rates were low (0.02 d ) at start bloom, but 8.8 peak bloom. Rate constants for BDMSC (kbc)...
The 18O technique is considered the most direct in vitro method for measuring gross primary production (GPP) aquatic ecosystems. This measures enrichment of dissolved O2 pool through photosynthesis after spiking a water sample with tracer amount 18O-labeled (18O-H2O) and incubating it under natural light conditions. Despite its advantages, has only scarcely been used to measure GPP ocean. lack 18O-based productivity measurements likely due technical difficulty associated collection,...
The photochemistry of dimethylsulfide (DMS) was examined in the Southern Ocean to assess its impact on biogeochemical dynamics DMS Antarctic waters. Very high photolysis rate constants (0.16–0.23 h −1 ) were observed surface waters exposed full sunlight. rates increased linearly with added nitrate concentrations, and 35% loss unamended samples attributed ambient (29 μM). Experiments optical filters showed that UV‐A band sunlight (320–400 nm) accounted for ∼65% suggesting dissolved organic...
ABSTRACT Over half of the bacterioplankton cells in ocean surface waters are capable carrying out a demethylation phytoplankton metabolite dimethylsulfoniopropionate (DMSP) that routes sulfur moiety away from climatically active gas dimethylsulfide (DMS). In this study, we tracked changes dmdA , gene responsible for DMSP demethylation, over course an induced bloom Gulf Mexico seawater microcosms. Analysis >91,000 amplicon sequences indicated 578 different sequence clusters at conservative...
Abstract. In the current era of rapid climate change, accurate characterization climate-relevant gas dynamics – namely production, consumption, and net emissions is required for all biomes, especially those ecosystems most susceptible to impact change. Marine environments include regions that act as sources or sinks numerous climate-active trace gases including methane (CH4) nitrous oxide (N2O). The temporal spatial distributions CH4 N2O are controlled by interaction complex biogeochemical...
Dimethylsulfoxide (DMSO) is an abundant form of methylated sulfur in marine systems and it known to be produced from dimethylsulfide (DMS). Using radiolabeled 35S‐DMS gas chromatography techniques, we quantified the dissolved DMSO (DMSOd) photo‐ biological oxidation DMS compared DMSOd production these pathways with net change concentrations unfiltered seawater samples. The light‐exposed treatments exceeded plus DMS. This indicated that was by one or more light‐driven processes likely...
Abstract Time‐series observations are critical to understand the structure, function, and dynamics of marine ecosystems. The Hawaii Ocean program has maintained near‐monthly sampling at Station ALOHA (22°45′N, 158°00′W) in oligotrophic North Pacific Subtropical Gyre (NPSG) since 1988 identified ecosystem variability over seasonal interannual timescales. To further extend temporal resolution these time‐series observations, an extensive field campaign was conducted during July–September 2012...
Summary The fraction of dissolved dimethylsulfoniopropionate (DMSPd) converted by marine bacterioplankton into the climate‐active gas dimethylsulfide (DMS) varies widely in ocean, with factors that determine this value still largely unknown. One current hypothesis is ratio DMS formation : DMSP demethylation determined availability, ‘availability’ both an absolute sense (i.e. concentration seawater) and a relative proportionally to other labile organic S compounds) proposed as critical...
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 70:189-205 (2013) - DOI: https://doi.org/10.3354/ame01644 Experimental assessment of marine bacterial respiration Sandra Martínez-García1,2,*, Emilio Fernández1, Daniela A. del Valle2, David M. Karl2, Eva Teira1 1Departamento Ecoloxía e Bioloxía Animal, Universidade de Vigo, Campus Lagoas-Marcosende, 36310 Spain 2Center...
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 66:47-62 (2012) - DOI: https://doi.org/10.3354/ame01557 Effect of visible light on dimethylsulfoniopropionate assimilation and conversion dimethylsulfide in North Pacific Subtropical Gyre Daniela A. del Valle1,2,*, Ronald P. Kiene3, David M. Karl1,2 1Department Oceanography, University Hawaii, Honolulu, Hawaii 96822, USA...
Summary The production of hydrogen ( H 2 ) is an inherent component biological dinitrogen N fixation, and there have been several studies quantifying relative to fixation in cultures diazotrophs. However, conducting the relevant measurements for a field population more complex as shown by this study consumption dissolved concentrations oligotrophic orth P acific O cean. Measurements oxidation revealed microbial was equivalent 1–7% ethylene produced during acetylene reduction assay 11–63% 15...
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 75:103-116 (2015) - DOI: https://doi.org/10.3354/ame01750 Methionine and dimethylsulfoniopropionate as sources of sulfur microbial community North Pacific Subtropical Gyre Daniela A. del Valle1,*, Sandra Martínez-García1,5, Sergio Sañudo-Wilhelmy2, Ronald P. Kiene3,4, David M. Karl1 1Department Oceanography, Daniel K....
The downward diffusion rates of H2 shown in Table 3 (column 4) should read 0.46 and 0.78 nmol m -2 h -1 for Stn 13, respectively.The authors thank John Cullen highlighting this.