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    Grazing experiment 6:Long term microzooplankton ingestion and growth on low-high pCO2 acclimated Rhodomonas sp. cultures ingested by Coxliella grazers (E Hux Response to pCO2 project)
    
  
  
    
    

Grazing experiment 6:Long term microzooplankton ingestion and growth on low-high pCO2 acclimated Rhodomonas sp. cultures ingested by Coxliella grazers (E Hux Response to pCO2 project)

Website: https://www.bco-dmo.org/dataset/669910
Data Type: experimental
Version:
Version Date: 2016-12-12

Project
» Planktonic interactions in a changing ocean: Biological responses of Emiliania huxleyi to elevated pCO2 and their effects on microzooplankton (E Hux Response to pCO2)
ContributorsAffiliationRole
Olson, Brady M.Western Washington University (WWU)Principal Investigator
Love, BrookeWestern Washington University (WWU)Co-Principal Investigator
Strom, SuzanneWestern Washington University (WWU)Co-Principal Investigator
Still, Kelly AnnWestern Washington University (WWU)Student
Copley, NancyWoods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager


Dataset Description

Related Reference: 
Still, Kelly Ann, Microzooplankton grazing, growth and gross growth efficiency are affected by pCO2 induced changes in phytoplankton biology. (Masters Thesis) Western Washington University. http://cedar.wwu.edu/cgi/viewcontent.cgi?article=1490&context=wwuet


Acquisition Description

The phytoplankton Rhodomonas sp. CCMP 755 was grown semi-continuously in atmosphere controlled chambers at three different CO2 treatment concentrations; Ambient (400ppmv), Moderate (750ppmv), and High (1000ppmv). Cultures were diluted daily starting day 4 with pre-equilibrated media containing f/50 nutrients. On day 11 Rhodomonas cells from the treatments replicates were pooled then used to inoculate Coxliella sp. experiment treatments. Rhodomonas were fed to Coxliella at saturating food concentrations (400 µg carbon/liter) and maintained for 5 days in treatment CO2 conditions with daily adjustments of Rhodomonas and media to maintain a steady state Rhodomonas density. After the 5 acclimation day, cell densities were again adjusted to maintain food concentration, then time zero samples were taken and fixed with acid Lugol’s for later cell counts of both Coxliella and Rhodomonas. After 24 hours, another set of samples was fixed for both types of cell counts as well as counts of Rhodomonas only controls.


Processing Description

These data are unprocessed counts of the Coxliella and Rhodomonas cells in a long term ingestion rate experiment.

BCO-DMO Processing Notes:
- added conventional header with dataset name, PI name, version date
- modified parameter names to conform with BCO-DMO naming conventions
- nd (no data) was entered into all blank cells


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Parameters

ParameterDescriptionUnits
treatment_replicatesample identifier: CO2 treatment and replicate unitless
Coxliella_per_ml_day_0number of Coxliella per ml at experiment initiation per milliliter
Coxliella_per_ml_day_1number of Coxliella per ml after 24 hours with treatment conditions and Rhodomonas per milliliter
Rhodo_per_ml_with_Coxliella_day_0Rhodomonas cells per ml at experiment initiation per milliliter
Rhodo_per_ml_with_Coxliella_day_1number of Rhodomonas per ml in grazing treatment after 24 hours per milliliter
Rhodo_per_ml_control_day_0number of Rhodomonas in controls with no grazers at initiation per milliliter
Rhodo_per_ml_control_day_1number of Rhodomonas in controls with no grazers after 24 hours per milliliter


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Instruments

Dataset-specific Instrument Name
epi-fluorescent microscope under blue-light excitation
Generic Instrument Name
Microscope-Fluorescence
Dataset-specific Description
For cell counts
Generic Instrument Description
Instruments that generate enlarged images of samples using the phenomena of fluorescence and phosphorescence instead of, or in addition to, reflection and absorption of visible light. Includes conventional and inverted instruments.


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Deployments

Lab_Olson_B

Website
Platform
WWU
Start Date
2011-03-31
End Date
2016-09-15
Description
laboratory experiments


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Project Information

Planktonic interactions in a changing ocean: Biological responses of Emiliania huxleyi to elevated pCO2 and their effects on microzooplankton (E Hux Response to pCO2)


Description from NSF award abstract: The calcifying Haptophyte Emiliania huxleyi appears to be acutely sensitive to the rising concentration of ocean pCO2. Documented responses by E. huxleyi to elevated pCO2 include modifications to their calcification rate and cell size, malformation of coccoliths, elevated growth rates, increased organic carbon production, lowering of PIC:POC ratios, and elevated production of the active climate gas DMS. Changes in these parameters are mechanisms known to elicit alterations in grazing behavior by microzooplankton, the oceans dominant grazer functional group. The investigators hypothesize that modifications to the physiology and biochemistry of calcifying and non-calcifying Haptophyte Emiliania huxleyi in response to elevated pCO2 will precipitate alterations in microzooplankton grazing dynamics. To test this hypothesis, they will conduct controlled laboratory experiments where several strains of E. huxleyi are grown at several CO2 concentrations. After careful characterization of the biochemical and physiological responses of the E. huxleyi strains to elevated pCO2, they will provide these strains as food to several ecologically-important microzooplankton and document grazing dynamics. E. huxleyi is an ideal organism for the study of phytoplankton and microzooplankton responses to rising anthropogenic CO2, the effects of which in the marine environment are called ocean acidification; E. huxleyi is biogeochemically important, is well studied, numerous strains are in culture that exhibit variation in the parameters described above, and they are readily fed upon by ecologically important microzooplankton. The implications of changes in microzooplankton grazing for carbon cycling, specifically CaCO3 export, DMS production, nutrient regeneration in surface waters, and carbon transfer between trophic levels are profound, as this grazing, to a large degree, regulates all these processes. E. huxleyi is a model prey organism because it is one of the most biogeochemically influential global phytoplankton. It forms massive seasonal blooms, contributes significantly to marine inorganic and organic carbon cycles, is a large producer of the climatically active gas DMS, and is a source of organic matter for trophic levels both above and below itself. The planned controlled study will increase our knowledge of the mechanisms that drive patterns of change between trophic levels, thus providing a wider array of tools necessary to understand the complex nature of ocean acidification field studies, where competing variables can confound precise interpretation.


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Funding

Funding SourceAward
NSF Division of Ocean Sciences (NSF OCE)

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This document is created by info v 4.1f 5 Oct 2018 from the content of the BCO-DMO metadata database.    2020-02-24  16:32:44