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            <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/dataset/722560.rdf" xlink:actuate="onRequest">N2O, 15N2, 15N tissue tracer in oyster aquariums (Oyster Reef N2O Emission project)</gmx:Anchor>
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                        <gco:Date>2019-05-08</gco:Date>
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                <gmx:Anchor xlink:href="http://orcid.org/0000-0003-0120-9984" xlink:title="ORCID" xlink:actuate="onRequest">Craig Tobias</gmx:Anchor>
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                <gmx:Anchor xlink:href="https://ror.org/02der9h97" xlink:title="ROR ID" xlink:actuate="onRequest">University of Connecticut</gmx:Anchor>
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                <gmx:Anchor xlink:href="https://ror.org/04eeqc889" xlink:title="ROR ID" xlink:actuate="onRequest">Virginia Institute of Marine Science</gmx:Anchor>
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                <gmx:Anchor xlink:href="https://ror.org/0130frc33" xlink:title="ROR ID" xlink:actuate="onRequest">University of North Carolina at Chapel Hill</gmx:Anchor>
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            <gco:CharacterString>Cite this dataset as: Tobias, C., Brush, M., Piehler, M., Song, B. (2017) N2O, 15N2, 15N tissue tracer in oyster aquariums (Oyster Reef N2O Emission project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2017-12-31 [if applicable, indicate subset used]. doi:10.1575/1912/bco-dmo.722560.1 [access date]</gco:CharacterString>
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        <gco:CharacterString>N2O, 15N2, 15N tissue tracer in oyster aquariums Dataset Description: &amp;lt;p&amp;gt;N2O, 15N2, 15N tissue tracer in oyster aquariums&amp;lt;/p&amp;gt; Methods and Sampling: &amp;lt;p&amp;gt;Three 9.45L aquariums contained twelve 7-cm long oysters pre-exposed to&amp;amp;nbsp;&amp;lt;sup&amp;gt;15&amp;lt;/sup&amp;gt;N labeled phytoplankton (OA1, OA2, OA3,) and three aquariums had no oysters and served as controls (CA1, CA2, CA3). These aquariums were filled with 0.1micron filtered seawater and a small circulation pump was added. N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O,&amp;amp;nbsp;&amp;lt;sup&amp;gt;15&amp;lt;/sup&amp;gt;N, and oxygen were measured initially and then aquariums sealed until oxygen had depleted to 2mgL&amp;lt;sup&amp;gt;-1&amp;lt;/sup&amp;gt;. Oysters were then harvested for their gill/mantle tissue (meat) and digestive tissue (digestive) over a period of time.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;Oxygen was measured insitu using an oxygen probe. Water samples for N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O analysis were collected with a peristaltic pump through a syringe needle directly into 12 ml exetainer that had been flushed with N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; and preserved with KOH to a pH above 12. Approximately six ml sample was collected. N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O concentrations in the headspace were measured on a GC-ECD.&amp;amp;nbsp; Water samples for 15N2 samples were collected with a peristaltic pump through a syringe needle directly into 30 ml serum bottles that had been flushed with He and preserved with KOH to a pH above 12. &amp;amp;nbsp; Approximately eight ml sample was collected. &amp;lt;sup&amp;gt;15&amp;lt;/sup&amp;gt;N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; was analyzed by GC - Isotope Ratio Mass Spectrometry (IRMS). Oyster tissue &amp;lt;sup&amp;gt;15&amp;lt;/sup&amp;gt;N samples were collected from the aquariums from dissections. &amp;lt;sup&amp;gt;15&amp;lt;/sup&amp;gt;N was analyzed on a elemental analyzer (EA) coupled with an IRMS.&amp;lt;/p&amp;gt;</gco:CharacterString>
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        <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/award/568863.rdf" xlink:title="OCE-1233372" xlink:actuate="onRequest">Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1233372 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1233372</gmx:Anchor>
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            <gmx:Anchor xlink:href="http://orcid.org/0000-0003-0120-9984" xlink:title="ORCID" xlink:actuate="onRequest">Craig Tobias</gmx:Anchor>
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&lt;p&gt;Oyster reefs are biogeochemical hot spots and prominent estuarine habitats that provide disproportionate ecological function. Suspension-feeding eastern oysters, Crassostrea virginica, are capable of improving water quality and diminishing eutrophication by filtering nutrients and particles from the water and depositing them in the sediments. Remineralization of these deposits may enhance sedimentary denitrification that facilitates nitrogen removal in tidal estuaries. However, the scientific underpinning of oyster reef function has been challenged in various studies. In addition, recent studies of filter feeding invertebrates reported the production of nitrous oxide (N2O), a greenhouse gas, as an end product of incomplete denitrification by gut microbes. C. virginica could be another source of N2O flux from intertidal habitats. Preliminary work indicated substantial N2O production from individual oysters. The estimated N2O production from high density oyster reefs may exceed the N2O flux measured from some estuaries. With the new discovery of N2O emission and uncertainty regarding eutrophication control, the ecological value of oyster reef restoration may become equivocal.&lt;/p&gt;
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	Description: &lt;p&gt;Represents when the experiment began and ended ( 0 - initial, 1- final). While all aquariums started at the same time, not all ended at the same time. The reason for multiple time points (i.e., 0,0,1,1,1,1) is to accommodate the multiple samples taken during that time point. For example, Timepoint 1, Hour 5, only applies to OA1 and OA2. However, Timepoint 1, Hour 69.50 applies to the remaining aquariums ( OA3, CA1, CA2, CA3). Under the &quot;Timepoint&quot; column is &quot;Oyster Harvests*&quot;, which marks the second phase of this Oyster Aquarium experiment. The data collected for that section would be Del15N digestive/ meat. &quot;Oyster Harvest&quot; is under that column since the oysters were harvested at time points indicated by the Time_Days / Hours column.&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/722593.rdf
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http://lod.bco-dmo.org/id/dataset-parameter/722594.rdf
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http://lod.bco-dmo.org/id/dataset-parameter/722595.rdf
	Name: OA1_15N2
	Units: permil
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http://lod.bco-dmo.org/id/dataset-parameter/722596.rdf
	Name: OA1_N2O
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http://lod.bco-dmo.org/id/dataset-parameter/722597.rdf
	Name: OA1_O2
	Units: mg/L
	Description: &lt;p&gt;Oyster aquarium 1 Aqueous O2 concentration&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/722598.rdf
	Name: OA1_Del15N_Digestive
	Units: permil
	Description: &lt;p&gt;Oyster aquarium 1 15N enrichment digestive tissue&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/722599.rdf
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http://lod.bco-dmo.org/id/dataset-parameter/722600.rdf
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http://lod.bco-dmo.org/id/dataset-parameter/722601.rdf
	Name: OA2_N2O
	Units: nM
	Description: &lt;p&gt;Oyster aquarium 2 Aqueous N2O concentration&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/722602.rdf
	Name: OA2_O2
	Units: mg/L
	Description: &lt;p&gt;Oyster aquarium 2 Aqueous O2 concentration&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/722603.rdf
	Name: OA2_Del15N_Digestive
	Units: permil
	Description: &lt;p&gt;Oyster aquarium 2 15N enrichment digestive tissue&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/722604.rdf
	Name: OA2_Del15N_Meat
	Units: permil
	Description: &lt;p&gt;Oyster aquarium 2 15N enrichment other (mantle; gills) tissue&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/722605.rdf
	Name: OA3_15N2
	Units: permil
	Description: &lt;p&gt;Oyster aquarium 3 15N enrichment of dissolved N2&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/722606.rdf
	Name: OA3_N2O
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	Description: &lt;p&gt;Oyster aquarium 3 Aqueous N2O concentration&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/722607.rdf
	Name: OA3_O2
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	Description: &lt;p&gt;Oyster aquarium 3 Aqueous O2 concentration&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/722608.rdf
	Name: OA3_Del15N_Digestive
	Units: permil
	Description: &lt;p&gt;Oyster aquarium 3 15N enrichment digestive tissue&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/722609.rdf
	Name: OA3_Del15N_Meat
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	Description: &lt;p&gt;Oyster aquarium 3 15N enrichment other (mantle; gills) tissue&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/722610.rdf
	Name: CA1_15N2
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	Description: &lt;p&gt;Control aquarium 1 15N enrichment of dissolved N2&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/722611.rdf
	Name: CA1_N2O
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	Description: &lt;p&gt;Control aquarium 1 Aqueous N2O concentration&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/722612.rdf
	Name: CA1_O2
	Units: mg/L
	Description: &lt;p&gt;Control aquarium 1 Aqueous O2 concentration&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/722613.rdf
	Name: CA2_15N2
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	Description: &lt;p&gt;Control aquarium 2 15N enrichment of dissolved N2&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/722614.rdf
	Name: CA2_N2O
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	Description: &lt;p&gt;Control aquarium 2 Aqueous N2O concentration&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/722615.rdf
	Name: CA2_O2
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	Description: &lt;p&gt;Control aquarium 2 Aqueous O2 concentration&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/722616.rdf
	Name: CA3_15N2
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	Description: &lt;p&gt;Control aquarium 3 15N enrichment of dissolved N2&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/722617.rdf
	Name: CA3_N2O
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	Description: &lt;p&gt;Control aquarium 3 Aqueous N2O concentration&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/722618.rdf
	Name: CA3_O2
	Units: mg/L
	Description: &lt;p&gt;Control aquarium 3 Aqueous O2 concentration&lt;/p&gt; 
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&amp;lt;p&amp;gt;Oxygen was measured insitu using an oxygen probe. Water samples for N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O analysis were collected with a peristaltic pump through a syringe needle directly into 12 ml exetainer that had been flushed with N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; and preserved with KOH to a pH above 12. Approximately six ml sample was collected. N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O concentrations in the headspace were measured on a GC-ECD.&amp;amp;nbsp; Water samples for 15N2 samples were collected with a peristaltic pump through a syringe needle directly into 30 ml serum bottles that had been flushed with He and preserved with KOH to a pH above 12. &amp;amp;nbsp; Approximately eight ml sample was collected. &amp;lt;sup&amp;gt;15&amp;lt;/sup&amp;gt;N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; was analyzed by GC - Isotope Ratio Mass Spectrometry (IRMS). Oyster tissue &amp;lt;sup&amp;gt;15&amp;lt;/sup&amp;gt;N samples were collected from the aquariums from dissections. &amp;lt;sup&amp;gt;15&amp;lt;/sup&amp;gt;N was analyzed on a elemental analyzer (EA) coupled with an IRMS.&amp;lt;/p&amp;gt;</gco:CharacterString>
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</gmd:CI_ResponsibleParty>
      </gmd:contact>
    </gmd:MD_MaintenanceInformation>
  </gmd:metadataMaintenance>
  <gmi:acquisitionInformation>
    <gmi:MI_AcquisitionInformation>
    <gmi:instrument>
        <gmi:MI_Instrument>
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/instrument/546339.rdf" xlink:title="Elemental Analyzer" xlink:actuate="onRequest">Costech Elemental Analyzer</gmx:Anchor>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:type>
            <gco:CharacterString>Costech Elemental Analyzer</gco:CharacterString>
          </gmi:type>
          <gmi:description>
            <gco:CharacterString>PI Supplied Instrument Name: Costech Elemental Analyzer PI Supplied Instrument Description:Oyster tissue 15N was analyzed via IRMS coupled to a Costech Elemental Analyzer. Instrument Name: Elemental Analyzer Instrument Short Name:   Instrument Description: Instruments that quantify carbon, nitrogen and sometimes other elements by combusting the sample at very high temperature and assaying the resulting gaseous oxides. Usually used for samples including organic material. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB01/</gco:CharacterString>
          </gmi:description>
        </gmi:MI_Instrument>
      </gmi:instrument>
      <gmi:instrument>
        <gmi:MI_Instrument>
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/instrument/661.rdf" xlink:title="Gas Chromatograph" xlink:actuate="onRequest">Agilent 7890B GC with a Poropak Column</gmx:Anchor>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:type>
            <gco:CharacterString>Agilent 7890B GC with a Poropak Column</gco:CharacterString>
          </gmi:type>
          <gmi:description>
            <gco:CharacterString>PI Supplied Instrument Name: Agilent 7890B GC with a Poropak Column PI Supplied Instrument Description:N2O was measured on a Agilent 7890B GC with a Poropak Column. Instrument Name: Gas Chromatograph Instrument Short Name:Gas Chromatograph   Instrument Description: Instrument separating gases, volatile substances, or substances dissolved in a volatile solvent by transporting an inert gas through a column packed with a sorbent to a detector for assay. (from SeaDataNet, BODC) Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB02/</gco:CharacterString>
          </gmi:description>
        </gmi:MI_Instrument>
      </gmi:instrument>
      <gmi:instrument>
        <gmi:MI_Instrument>
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/instrument/469.rdf" xlink:title="Isotope-ratio Mass Spectrometer" xlink:actuate="onRequest">Thermo Delta V IRMS</gmx:Anchor>
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          </gmi:identifier>
          <gmi:type>
            <gco:CharacterString>Thermo Delta V IRMS</gco:CharacterString>
          </gmi:type>
          <gmi:description>
            <gco:CharacterString>PI Supplied Instrument Name: Thermo Delta V IRMS PI Supplied Instrument Description:15N2 was measured on a Thermo Delta V IRMS fitted with a Gas Bench II interface following separation from O2 and Ar on a mol sieve 5A column. Instrument Name: Isotope-ratio Mass Spectrometer Instrument Short Name:IR Mass Spec; IRMS   Instrument Description: The Isotope-ratio Mass Spectrometer is a particular type of mass spectrometer used to measure the relative abundance of isotopes in a given sample (e.g. VG Prism II Isotope Ratio Mass-Spectrometer). Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB16/</gco:CharacterString>
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        </gmi:MI_Instrument>
      </gmi:instrument>
      <gmi:instrument>
        <gmi:MI_Instrument>
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/instrument/705.rdf" xlink:title="Oxygen Sensor" xlink:actuate="onRequest">Thermo Orion rugged dissolved oxygen probe</gmx:Anchor>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:type>
            <gco:CharacterString>Thermo Orion rugged dissolved oxygen probe</gco:CharacterString>
          </gmi:type>
          <gmi:description>
            <gco:CharacterString>PI Supplied Instrument Name: Thermo Orion rugged dissolved oxygen probe PI Supplied Instrument Description:Oxygen was measured using a Thermo Orion rugged dissolved oxygen probe. Instrument Name: Oxygen Sensor Instrument Short Name:Dissolved Oxygen Sensor   Instrument Description: An electronic device that measures the proportion of oxygen (O2) in the gas or liquid being analyzed</gco:CharacterString>
          </gmi:description>
        </gmi:MI_Instrument>
      </gmi:instrument>
      </gmi:MI_AcquisitionInformation>
  </gmi:acquisitionInformation>
</gmi:MI_Metadata>
