Archive for size

The ocean’s smallest phytoplankton may be bigger than we thought

Posted by mmaheigan 
· Tuesday, December 17th, 2019 

Flow cytometry can sort hundreds of thousands of phytoplankton cells in minutes, a tool that has been exploited for over thirty years in marine science. However, skilled analysts are still needed for manual interpretation of these cells into different types and then further into size distributions and optical properties.

In a recent study published in Applied Optics, the authors developed and implemented an automated scheme on the large Atlantic Meridional Transect flow cytometric database, which contains around 104 samples and 109 cells (the entire AMT flowcytometric dataset which spans a decade of transects (AMT18 – AMT27). This unique, well-calibrated dataset spans 100° of latitude between the UK and the Falklands, with multiple samples between 0-200m. The results clearly show that Prochlorococcus, very small marine cyanobacteria, are consistently larger than previously thought (>0.65 µm), and their size distribution reveals a distinctive double peak (0.75 µm and 1.75 µm) that varies strongly with depth. This is coupled with changes in Prochlorococcus optical properties, a term we have coined “opto-types.”  By contrast, Synechococcus are typically 1.5 µm in diameter and more homogeneously dispersed.

Figure 1: North to South transect (bottom left) of the Atlantic Ocean showing the variability in the abundance (top left), size (top right) and refractive index (bottom right) of Prochlorococcus

This work has uncovered new information regarding the size distribution of the ocean’s smallest phytoplankton, which has implications for how energy is transferred between different biological organisms.

 

Authors:
Tim Smyth (Plymouth Marine Laboratory)
Glen Tarran (Plymouth Marine Laboratory)
Shubha Sathyendranath (Plymouth Marine Laboratory)

Pumped up by the cold: Increased elemental density in polar diatoms

Posted by mmaheigan 
· Monday, October 28th, 2019 

Large diatoms are common in polar phytoplankton blooms, contributing significantly to food webs and carbon export, but relatively little is known about their elemental biogeochemistry. A recent study in Frontiers in Marine Science showed that the size-dependent increase in cell nutrient content for polar diatoms was similar to published values for temperate diatoms, whereas the elemental density (mass per unit volume) of polar diatoms was substantially greater for all elements measured (carbon, nitrogen, silicon and phosphorus). Furthermore, at near freezing culture temperatures, there was a positive relationship between diatom size and realized growth rates near their theoretical maximum (Figure 1). Because of the differences in elemental density between carbon and silica, these diatoms exhibited particulate C:Si ratios that are commonly interpreted as a sign of iron limitation; yet these cultures were trace metal-replete. The observed elemental composition differences suggest that it may be important for polar biogeochemical models to include different representations of diatom biogeochemistry by accounting for the functions of size and near freezing temperature.

Figure 1. Left: Cellular carbon content for polar diatoms across four orders of magnitude in biovolume compared to the same relationship for a wide range of non-polar diatoms (MD&L = Menden-Deuer & Lessard, 2000). The y-intercept is the estimate of the baseline carbon density in these polar diatoms, and is significantly higher than the literature values reviewed in MD&L (2000). Right: Growth rate of the same polar diatoms expressed as a percent of their calculated maximum growth rate at 2°C. Error bars represent the range of values observed in the experiments. Maximum growth rate was estimated by 1) applying the growth rate/biovolume relationships published by Chisholm (1992) and Edwards et al. (2012) to the observed biovolume for each culture, and 2) scaling this growth rate to 2°C growth temperature using the relationship of Eppley (1972).

Authors:
Michael Lomas (Bigelow Laboratory for Ocean Sciences)
Steven Baer (Maine Maritime Academy)
Sydney Acton (Dauphin Island Sea Lab)
Jeffrey Krause (Dauphin Island Sea Lab and University of South Alabama)

Filter by Keyword

abundance acidification africa air-sea interactions alkalinity allometry ammonium AMOC anoxic Antarctic anthropogenic carbon aragonite saturation arctic arsenic Atlantic Atlantic modeling atmospheric CO2 atmospheric nitrogen deposition authigenic carbonates autonomous platforms bacteria BATS bgc argo bioavailability biogeochemical cycles biogeochemical models biological pump biological uptake biophysics bloom blue carbon bottom water boundary layer buffer capacity CaCO3 calcification calcite carbon-climate feedback carbon-sulfur coupling carbon cycle carbon dioxide carbon sequestration Caribbean CCS changing marine ecosystems changing ocean chemistry chemoautotroph chl a chlorophyll circulation climate change CO2 coastal ocean cobalt Coccolithophores community composition conservation cooling effect copepod coral reefs currents cyclone DCM decomposers decomposition deep convection deep ocean deep sea coral deoxygenation depth diagenesis diatoms DIC diel migration dimethylsulfide dissolved inorganic carbon dissolved organic carbon DOC domoic acid dust earth system models eddy Education Ekman transport emissions ENSO enzyme equatorial regions ESM estuarine and coastal carbon fluxes estuary evolution export EXPORTS extreme weather events faecal pellets filter feeders filtration rates fish Fish carbon fisheries floats fluid dynamics fluorescence food webs forams freshening frontal zone future oceans geochemistry geoengineering GEOTRACES glaciers gliders global carbon budget global warming go-ship grazing greenhouse gas Greenland groundwater Gulf of Maine Gulf of Mexico Gulf Stream gyre harmful algal bloom high latitude human impact hydrothermal hypoxia ice age ice cores ice cover industrial onset iron iron fertilization isotopes jellies katabatic winds kelvin waves krill kuroshio land-ocean continuum larvaceans lateral transport lidar ligands light mangroves marine food webs marine snowfall marshes meltwater mesopelagic mesoscale metagenome metals methane microbes microlayer microorganisms microscale microzooplankton midwater mixed layer mixotrophy modeling mode water molecular diffusion MPT multi-decade NASA net community production new technology nitrate nitrogen nitrogen fixation nitrous oxide north atlantic north pacific nutricline nutrient budget nutrient cycling nutrient limitation ocean-atmosphere ocean acidification ocean carbon uptake and storage ocean color ocean observatories ODZ oligotrophic omics OMZ open ocean optics organic particles overturning circulation oxygen pacific paleoceanography particle flux pCO2 PDO peat pelagic pH phenology phosphorus photosynthesis physical processes physiology phytoplankton plankton POC polar regions pollutants prediction primary productivity proteins pteropods pycnocline radioisotopes remineralization remote sensing residence time resource management respiration resuspension rivers Rossby waves Ross Sea ROV salinity salt marsh satellite scale seafloor seagrass sea ice sea level rise seasonal patterns seaweed sediments sensors shelf system shells ship-based observations silicate sinking particles size SOCCOM soil carbon southern ocean south pacific spatial covariations speciation subduction submesoscale subpolar subtropical surface surface ocean teleconnections temperate temperature temporal covariations thermocline thermohaline thorium tidal time-series time of emergence top predators trace elements trace metals trait-based transfer efficiency transient features trophic transfer tropical turbulence twilight zone upper ocean upper water column upwelling US CLIVAR validation velocity gradient ventilation vertical flux vertical migration vertical transport volcano water quality western boundary currents wetlands winter mixing zooplankton

Copyright © 2020 - OCB Project Office, Woods Hole Oceanographic Institution, 266 Woods Hole Rd, MS #25, Woods Hole, MA 02543 USA Phone: 508-289-2838  •  Fax: 508-457-2193  •  Email: ocb_news@us-ocb.org

link to nsflink to noaalink to WHOI

Funding for the Ocean Carbon & Biogeochemistry Project Office is provided by the National Science Foundation (NSF) and the National Aeronautics and Space Administration (NASA). The OCB Project Office is housed at the Woods Hole Oceanographic Institution.