Accelerated dissolution of diatom silica by marine bacterial assemblages

  title={Accelerated dissolution of diatom silica by marine bacterial assemblages},
  author={Kay D. Bidle and Farooq Azam},
Downward fluxes of biogenic silica and organic matter in the global ocean derive dominantly from the productivity of diatoms — phytoplankton with cell walls containing silica encased in an organic matrix,. As diatoms have an absolute requirement for silicon (as silicic acid), its supply into the photic zone — largely by silica dissolution and upwelling — controls diatom production (and consequently the biological uptake of atmospheric CO2 by the ocean) over vast oceanic areas. Current… 
Controls on the Recycling and Preservation of Biogenic Silica from Biomineralization to Burial
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The role of oxygen conditions in the microbial dissolution of biogenic silica under brackish conditions
Regeneration of biogenic silica (BSi) is essential for the constant supply of dissolved silica (DSi) to diatoms in aquatic ecosystems, where these primary producers play an important role in carbon
Dissolution of biogenic silica from land to ocean: Role of salinity and pH
The dissolution rates of diatom frustules, phytoliths, two diatomaceous lake sediments, a siliceous ooze from the Southern Ocean, a diatomite deposit, and a synthetic amorphous silica were measured
Influence of bacteria and salinity on diatom biogenic silica dissolution in estuarine systems
It is hypothesized that bacterial colonization increases bSiO2 dissolution by creating a microenvironment at the diatom surface with high ectoproteolytic activity but also via the release of metabolic byproducts since the presence of organic matter seems generally to facilitate diatom bSi O2 dissolution.
Dissolution of biogenic silica: Roles of pH, salinity, pressure, electrical charging and reverse weathering
The recycling of biogenic silica (bSiO2) produced by diatoms is a vital process sustaining a significant fraction of primary production in the oceans. The efficiency with which bSiO2 dissolves
Silicon limitation facilitates virus infection and mortality of marine diatoms
Using metatranscriptomics of diatom-associated viruses and quantification of extracellular viruses in coastal water samples, the authors link silicon limitation to increased virus-induced mortality of diatoms, which could have implications for marine biogeochemical cycling.
Evidence for reduced biogenic silica dissolution rates in diatom aggregates
Because aggregated diatoms sink rapidly through the water column, leaving little time for dissolution, aggregation influences the balance between recycling of biogenic silica (bSiO2) and its
Microbial mediation of benthic biogenic silica dissolution
Pore water profiles from 24 stations in the South Atlantic (located in the Guinea, Angola, Cape, Guyana, and Argentine basins) show good correlations of oxygen and silicon, suggesting microbially
Bioavailability of different chemical forms of dissolved silica can affect marine diatom growth
AbstractIn this study, we demonstrate that dissolved silica obtained from mineral (crys-talline quartz), biogenic amorphous (diatomaceous earth) and artificial amor-phous sources (Aerosil) influence


Silicate regulation of new production in the equatorial Pacific upwelling
Surface waters of the eastern equatorial Pacific Ocean present the enigma of apparently high plant-nutrient concentrations but low phytoplankton biomass and productivity. One explanation for this
Production and dissolution of biogenic silica in the ocean: Revised global estimates, comparison with regional data and relationship to biogenic sedimentation
We estimate the global rate of biogenic silica production in the ocean to be between 200 and 280 × 1012 mol Si yr−1. The upper limit is derived from information on the primary productivity of the
Silica cycling within marine snow
The silica cycle within particles of marine snow from coastal waters off central California was examined. The ratios of biogenic silica to particulate organic nitrogen and to particulate org.anic
Bacterial production in fresh and saltwater ecosystems: a cross-system overview
Heterotrophic bacterial production is a large component of total secondary production and is roughly twice as large as the production of macrozooplankton for a given level of primary production.
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LARGE, rapidly sinking organic aggregates are an important component of the carbon flux from the ocean's surface to its depths. Marine snow, the main type of large (<0.5 mm) aggregate, is heavily
sedimentary fluxes on the Ross Sea continental shelf
We examined the cycling of organic carbon and biogenic silica in the water column and upper sediments of the Ross Sea, seeking to understand the processes leading to the formation of opal-rich,
Dissolution rates of silica from diatoms decomposing at various temperatures
The dissolution rate coefficient at early stage (K1) can be predicted as a function of temperature (T°C) and this equation will also be applied to a new approach for the fate and behavior of biogenous silica settling through a water column by introducing the term temperature into a model.
Rate of dissolution of diatom silica walls in seawater
The solubility and dissolution rate of silica were investigated using cell walls prepared from two species of diatoms, Thalassiosira decipiens and Rhizosolenia hebetata forma semispina, and the rate of dissolution differed not only from one species to another but also from one portion to another portion of the same wall.