Temporal variations in diatom abundance and downward vertical flux in the oligotrophic North Pacific gyre

@inproceedings{Scharek1999TemporalVI,
  title={Temporal variations in diatom abundance and downward vertical flux in the oligotrophic North Pacific gyre},
  author={R. Scharek and M. Latasa and D. Karl and R. Bidigare},
  year={1999}
}
Abstract The abundance of diatoms in the water column and the downward vertical flux of diatom cells from the euphotic zone were investigated during a time series of 11 monthly cruises (June 1994–July 1995) to Station ALOHA (22°45′N, 158°00′W) as one component of the Hawaii Ocean Time-series (HOT) Program. The diatom community was studied using light microscopy and by high-performance liquid chromatographic (HPLC) pigment analyses. Distinct diatom assemblages were found in the mixed-layer and… Expand

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References

SHOWING 1-10 OF 64 REFERENCES
Annual variability of phytoplankton and bacteria in the subtropical North Pacific Ocean at Station ALOHA during the 1991–1994 ENSO event
TLDR
Time-series data on community structure in the upper 200 m at Station ALOHA in the subtropical North Pacific were collected at approximately monthly intervals from December 1990 through to March 1994 during an extended El Niiio-Southern Oscillation (ENSO) event, with significant interannual variation in the total 200-m integrated microbial carbon estimates. Expand
Plankton-pigment relationships in the northwestern Mediterranean during stratification
TLDR
Changes in pigment/cell ratios throughout the deep pigment maximum layer suggest that this is a zone of significant gradients in parameters affecting phytoplankton growth. Expand
Photosynthetic picoplankton community structure in the subtropical North Pacific Ocean near Hawaii (station ALOHA)
TLDR
The structure of the picoplankton community in the subtropical Pacific was examined on four depth profiles, one from each season, sampled at the Hawaii Ocean Time-series station ALOHA and it is believed this structure, dominated by Prochlorococcus, may be typical for subtropicals open-ocean regions. Expand
Phytoplankton in an oligotrophic ocean : species structure and interannual variability
TLDR
This study supports earlier conclusions that the epiplanktonic populations of the North Pacific central environment are more stable than those of most other planktonic ecosystems. Expand
Silica production and the contribution of diatoms to new and primary production in the central North Pacific
The silica cycle in the upper 200 m of the central North Pacific was examined to further assess the role of oligotrophic mid-ocean gyres in the global marine silica cycle and to evaluate the role ofExpand
Spatial and temporal distributions of prochlorophyte picoplankton in the North Atlantic Ocean
Over the past several years red-fluorescing picoplankton, believed to be prochlorophytes, have been shown to be extremely abundant in the North Atlantic and Pacific Oceans. The dim fluorescence ofExpand
Potential role of large oceanic diatoms in new primary production
Very large phytoplankton species >50 μm in size, particularly diatoms, generally are found in background numbers throughout the euphotic zone of oceanic waters. Yet, when responding to episodicExpand
Seasonal patterns of ocean biogeochemistry at the U.S. JGOFS Bermuda Atlantic time-series study site
Seasonal patterns in hydrography, oxygen, nutrients, particulate carbon and nitrogen and pigments were measured on monthly cruises at the Bermuda Atlantic Time-series Study site, 80 km southeast ofExpand
Temporal variability of phytoplankton community structure based on pigment analysis
TLDR
Results from size fractionation and normal-phase high performance liquid chromatography confirm that Prochforococcus spp. Expand
Vertical fluxes of carbon, nitrogen, and phosphorus in the North Pacific Subtropical Gyre near Hawaii
The hypothesized “biological pump” mechanism for removing carbon from the euphotic zone to the deep ocean requires different rates of recycling of C, N, and P in sinking particles. At Station ALOHAExpand
...
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2
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4
5
...