TN249-10 Microzooplankton Grazing and Phytoplankton Growth Rates

During the R/V Thompson long spring Bering Sea Ecosystem Study-Bering Sea Integrated Ecosystem Research Program (BEST-BSIERP) cruise in May-June 2010, 18 dilution experiments were carried out. We compared the rates of algal growth in whole water and in 10 % whole water diluted with particle-free filtered water over a 24 hour day- night cycle at light levels of 15% to 30% of surface incident light. 11 experiments yielded significant microzooplankton grazing rates. Phytoplankton growth rates varied from slightly negative, probably due to a senescent diatom bloom, to a maximum daily rate of 0.39 d-1 where initial chl-a concentration was low, only 0.5 micro-g l-1. Microzooplankton grazing impact ranged from negligible to more that 3 times daily phytoplankton growth. On average, microzooplankton grazing mortality was about 63% of daily phytoplankton growth. The average grazing impact in 2010 was higher than that found in the spring during the 2008 and 2009 cruises when much of the cruise track was in heavy sea ice. Because less time was spent in the ice and the season was more advanced, the experiment incubation temperatures, from 0.4 to 5 degrees C, were somewhat higher during the 2010 cruise compared to the previous 2 spring cruises. BEST-BSIERP together are the Bering Sea project.

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Temporal Range

  • Begin:  2010-05-11T06:00:00Z
    End:  2010-06-10T10:00:00Z


Resource Type dataset
Temporal Range Begin 2010-05-11T06:00:00Z
Temporal Range End 2010-06-10T10:00:00Z
Temporal Resolution N/A
Bounding Box North Lat 62.00000
Bounding Box South Lat 56.00000
Bounding Box West Long -178.50000
Bounding Box East Long -163.50000
Spatial Representation grid
Spatial Resolution N/A
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Documentation #1 : Sherr_2010_dilution_assay_metadata.pdf

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Asset Size 1 MB
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Resource Support Name EOL Data Support
Resource Support Email
Resource Support Organization UCAR/NCAR - Earth Observing Laboratory
Distributor UCAR/NCAR - Earth Observing Laboratory
Metadata Contact Name EOL Data Support
Metadata Contact Email
Metadata Contact Organization UCAR/NCAR - Earth Observing Laboratory

Author Evelyn B. Sherr
Barry F. Sherr
Publisher UCAR/NCAR - Earth Observing Laboratory
Publication Date 2010-07-06T10:35:43
Digital Object Identifier (DOI)
Alternate Identifier 102.167
Resource Version 1.0
Topic Category biota
Progress completed
Metadata Date 2021-10-01T16:05:10Z
Metadata Record Identifier edu.ucar.eol::102.167
Metadata Language eng; USA
Suggested Citation Evelyn B. Sherr, Barry F. Sherr. (2010). TN249-10 Microzooplankton Grazing and Phytoplankton Growth Rates. 1.0. UCAR/NCAR - Earth Observing Laboratory. Accessed 04 June 2023.

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