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            <gco:CharacterString>Cite this dataset as: Goffredi, S. (2026) Bacterial 16S rRNA barcodes associated with methane seep invertebrates collected off of the Aleutian Islands, Gulf of Alaska on R/V Atlantis cruise AT50-24 from May to June 2024. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2026-09-15 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/1007825 [access date]</gco:CharacterString>
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        <gco:CharacterString>Methods and Sampling: &amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Sampling&amp;lt;/strong&amp;gt;&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;Seep invertebrates were collected from the Sanak seep off of Alaska in June 2024 (53.74865 N/ −162.58970 W; 2,020 m) aboard the R/V Atlantis (expedition AT50-24) with HOV Alvin (operated by the Woods Hole Oceanographic Institution). Specimens for molecular analysis were preserved within 2 h of collection in ~90% ethanol and stored at 4 °C. Total genomic DNA was extracted from whole specimens preserved in ethanol using the Qiagen DNeasy kit (Qiagen, Valencia, CA) according to the manufacturer’s instructions.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Data Collection Methods&amp;lt;/strong&amp;gt;&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;Total DNA extracted was quantified via a Qubit 3.0 fluorometer using the dsDNA BR Assay Kit (Thermo Fisher Scientific). The V4-V5 hypervariable region of the 16S rRNA gene was PCR amplified using bacterial primers [515F: GTGYCAGCMGCCGCGGTAA and 806R: GGACTACHVGGGTWTCTAAT] with Illumina adapters on the 5′ end (San Diego, CA). Each PCR product was secondarily barcoded with Illumina NexteraXT index v2 Primers that included unique 8-bp barcodes, with NEB Q5 Hot Start High-Fidelity Mix at an annealing temperature of 66 °C for 11 cycles. Barcoded products were purified using Millipore-Sigma (St. Louis, MO) MultiScreen Plate MSNU03010 with a vacuum manifold and quantified using the QuantIT PicoGreen dsDNA Assay Kit (ThermoFisher Scientific) on a BioRad CFX96 Touch Real-Time PCR Detection System. Barcoded samples were combined in approximately equimolar amounts, purified again with Promega’s Wizard SV Gel and PCR Clean-up System (#A9281), and quantified again using the QuBit system. This sample was submitted to Laragen, Inc. (Culver City, CA) for 2× 250 bp paired-end analysis on the Illumina MiSeq platform with 20% PhiX addition.&amp;lt;/p&amp;gt;</gco:CharacterString>
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	Name: SG_AD5278_S1_pycnogonid_S161
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http://lod.bco-dmo.org/id/dataset-parameter/1008232.rdf
	Name: SG_AD5279_S4_pycnogonid_S162
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	Description: &lt;p&gt;host animal identity&lt;/p&gt; 
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	Name: SG_AD5280_R3_encrusting_sponge_S160
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	Name: SG_AD5280_S4_Sibglinum_troph_S177
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http://lod.bco-dmo.org/id/dataset-parameter/1008235.rdf
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http://lod.bco-dmo.org/id/dataset-parameter/1008236.rdf
	Name: SG_Sanak_hydroids_AD5273_BB16_S165
	Units: read counts
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http://lod.bco-dmo.org/id/dataset-parameter/1008237.rdf
	Name: SG_Sanak_isopod_AD5277_BT2_S163
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http://lod.bco-dmo.org/id/dataset-parameter/1008238.rdf
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http://lod.bco-dmo.org/id/dataset-parameter/1008239.rdf
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http://lod.bco-dmo.org/id/dataset-parameter/1008240.rdf
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	Units: unitless
	Description: &lt;p&gt;Taxonomic designation of the representative bacteria at the level of Class&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/1008241.rdf
	Name: order
	Units: unitless
	Description: &lt;p&gt;Taxonomic designation of the representative bacteria at the level of Order&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/1008242.rdf
	Name: family
	Units: unitless
	Description: &lt;p&gt;Taxonomic designation of the representative bacteria at the level of Family&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/1008243.rdf
	Name: genus
	Units: unitless
	Description: &lt;p&gt;Taxonomic designation of the representative bacteria at the level of Genus, if known&lt;/p&gt; 
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Parameter details: 

Parameter name (i.e., column name), Parameter description, parameter units
"sample_name", "Sample name", "unitless"
"host", "animal host identity", "unitless"
"isolation_source", "isolation source", "unitless"
"collection_date", "Date of sample collection", "unitless"
"geo_loc_name", "geolocation", "unitless"
"lat", "latitude", "decimal degrees"
"lon", "longitude", "decimal degrees"
"samp_collect_device", "sample collection device", "unitless"
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&amp;lt;p&amp;gt;Seep invertebrates were collected from the Sanak seep off of Alaska in June 2024 (53.74865 N/ −162.58970 W; 2,020 m) aboard the R/V Atlantis (expedition AT50-24) with HOV Alvin (operated by the Woods Hole Oceanographic Institution). Specimens for molecular analysis were preserved within 2 h of collection in ~90% ethanol and stored at 4 °C. Total genomic DNA was extracted from whole specimens preserved in ethanol using the Qiagen DNeasy kit (Qiagen, Valencia, CA) according to the manufacturer’s instructions.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Data Collection Methods&amp;lt;/strong&amp;gt;&amp;lt;/p&amp;gt;

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- Treated empty cells, nd, and NA as missing values.
- Named the resulting table 1007825_v1_alaskan_methane_seep_bacteria_16s_rrna_barcodes.
- Set the taxonomic columns (ASV, class, domain, family, genus, order, and phylum) as text fields.
- Set all sample barcode count columns as integer fields.
- Saved the processed data as 1007825_v1_alaskan_methane_seep_bacteria_16s_rrna_barcodes.csv.
- Sample names, and environmental metadata can be found within the supplemental file (1007825_v1_at50_24_sra_2026_project_info.csv). 

Curation Actions Performed on Metadata
- The temporal range noted for this dataset relates to the sample collection periods represented in supplemental file 1007825_v1_at50_24_sra_2026_project_info.csv.
- All raw fastq files associated with this dataset are available in the supplemental files section within the compressed folder named 1007825_v1_at50_24_fastq.zip.
- The raw fasta file associated with the barcodes of this dataset are available in the supplemental file 1007825_v1_at50_24_sra_2026_Bacterial_16S_barcodes_asvs.fasta.</gco:CharacterString>
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            <gco:CharacterString>Qubit 3.0 fluorometer (Thermo Fisher Scientific), using dsDNA BR Assay Kit</gco:CharacterString>
          </gmi:type>
          <gmi:description>
            <gco:CharacterString>PI Supplied Instrument Name: Qubit 3.0 fluorometer (Thermo Fisher Scientific), using dsDNA BR Assay Kit PI Supplied Instrument Description:Total DNA extracted was quantified via a Qubit 3.0 fluorometer using the dsDNA BR Assay Kit (Thermo Fisher Scientific). Instrument Name: Fluorometer Instrument Short Name:Fluorometer   Instrument Description: A fluorometer or fluorimeter is a device used to measure parameters of fluorescence: its intensity and wavelength distribution of emission spectrum after excitation by a certain spectrum of light. The instrument is designed to measure the amount of stimulated electromagnetic radiation produced by pulses of electromagnetic radiation emitted into a water sample or in situ. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/113/</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/880039.rdf" xlink:title="HOV Alvin" xlink:actuate="onRequest">HOV Alvin manipulator and/or suction sampler</gmx:Anchor>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:type>
            <gco:CharacterString>HOV Alvin manipulator and/or suction sampler</gco:CharacterString>
          </gmi:type>
          <gmi:description>
            <gco:CharacterString>PI Supplied Instrument Name: HOV Alvin manipulator and/or suction sampler PI Supplied Instrument Description:Seep invertebrates were collected from the Sanak seep off of Alaska in June 2024 (53.74865 N/ −162.58970 W; 2,020 m) aboard the R/V Atlantis (expedition AT50-24) with HOV Alvin (operated by the Woods Hole Oceanographic Institution).  Instrument Name: HOV Alvin Instrument Short Name:   Instrument Description: Human Occupied Vehicle (HOV) Alvin is part of the National Deep Submergence Facility (NDSF). Alvin enables in-situ data collection and observation by two scientists to depths reaching 6,500 meters, during dives lasting up to ten hours.

Commissioned in 1964 as one of the world’s first deep-ocean submersibles, Alvin has remained state-of-the-art as a result of numerous overhauls and upgrades made over its lifetime. The most recent upgrades, begun in 2011 and completed in 2021, saw the installation of a new, larger personnel sphere with a more ergonomic interior; improved visibility and overlapping fields of view; longer bottoms times; new lighting and high-definition imaging systems; improved sensors, data acquisition and download speed.  It also doubled the science basket payload, and improved the command-and-control system allowing greater speed, range and maneuverability.

With seven reversible thrusters, it can hover in the water, maneuver over rugged topography, or rest on the sea floor.  It can collect data throughout the water column, produce a variety of maps and perform photographic surveys.  Alvin also has two robotic arms that can manipulate instruments, obtain samples, and its basket can be reconfigured daily based on the needs of the upcoming dive.

Alvin's depth rating of 6,500m gives researchers in-person access to 99% of the ocean floor.  Alvin is a proven and reliable platform capable of diving for up to 30 days in a row before requiring a single scheduled maintenance day.  Recent collaborations with autonomous vehicles such as Sentry have proven extremely beneficial, allowing PIs to visit promising sites to collect samples and data in person within hours of their being discovered, and UNOLs driven technological advances have improved the ability for scientific outreach and collaboration via telepresence

Alvin is named for Allyn Vine, a WHOI engineer and geophysicist who helped pioneer deep submergence research and technology.

(from https://www.whoi.edu/what-we-do/explore/underwater-vehicles/hov-alvin/, accessed 2022-09-09)</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/471582.rdf" xlink:title="Thermal Cycler" xlink:actuate="onRequest">BioRad CFX96 Touch Real-Time PCR Detection System</gmx:Anchor>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:type>
            <gco:CharacterString>BioRad CFX96 Touch Real-Time PCR Detection System</gco:CharacterString>
          </gmi:type>
          <gmi:description>
            <gco:CharacterString>PI Supplied Instrument Name: BioRad CFX96 Touch Real-Time PCR Detection System PI Supplied Instrument Description:Total DNA extracted was quantified via a Qubit 3.0 fluorometer using the dsDNA BR Assay Kit (Thermo Fisher Scientific). Instrument Name: Thermal Cycler Instrument Short Name:Thermal Cycler   Instrument Description: A thermal cycler or &quot;thermocycler&quot; is a general term for a type of laboratory apparatus, commonly used for performing polymerase chain reaction (PCR), that is capable of repeatedly altering and maintaining specific temperatures for defined periods of time. The device has a thermal block with holes where tubes with the PCR reaction mixtures can be inserted. The cycler then raises and lowers the temperature of the block in discrete, pre-programmed steps. They can also be used to facilitate other temperature-sensitive reactions, including restriction enzyme digestion or rapid diagnostics.

(adapted from http://serc.carleton.edu/microbelife/research_methods/genomics/pcr.html)</gco:CharacterString>
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        </gmi:MI_Instrument>
      </gmi:instrument>
      <gmi:operation>
          <gmi:MI_Operation>
            <gmi:description>
              <gco:CharacterString>Cruise: AT50-24</gco:CharacterString>
            </gmi:description>
            <gmi:identifier>
              <gmd:MD_Identifier>
                <gmd:code>
                  <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/deployment/984569.rdf" xlink:title="Cruise" xlink:actuate="onRequest">AT50-24</gmx:Anchor>
                </gmd:code>
              </gmd:MD_Identifier>
            </gmi:identifier>
            <gmi:status>
              <gmd:MD_ProgressCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_ProgressCode" codeListValue="completed"/>
            </gmi:status>
            <gmi:type>
              <gmi:MI_OperationTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MI_OperationTypeCode" codeListValue="real"/>
            </gmi:type>
            <gmi:parentOperation gco:nilReason="inapplicable"/>
            <gmi:platform>
  <gmi:MI_Platform>
    <gmi:citation>
     <gmd:CI_Citation>
       <gmd:title>
         <gmx:Anchor xlink:href="http://www.whoi.edu/page.do?pid=8143" xlink:actuate="onRequest">R/V Atlantis</gmx:Anchor>
       </gmd:title>
       <gmd:date gco:nilReason="unknown"/>
     </gmd:CI_Citation>
    </gmi:citation>
    <gmi:citation>
     <gmd:CI_Citation>
       <gmd:title>
         <gmx:Anchor xlink:href="http://vocab.nerc.ac.uk/collection/C17/current/33AT" xlink:actuate="onRequest">Community Standard Description</gmx:Anchor>
       </gmd:title>
       <gmd:date gco:nilReason="unknown"/>
     </gmd:CI_Citation>
    </gmi:citation>
    <gmi:identifier>
      <gmd:MD_Identifier>
        <gmd:authority>
          <gmd:CI_Citation>
            <gmd:title>
              <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/authority/1.rdf" xlink:actuate="onRequest">International Council for the Exploration of the Sea</gmx:Anchor>
            </gmd:title>
            <gmd:date gco:nilReason="unknown"/>
          </gmd:CI_Citation>
        </gmd:authority>
        <gmd:code>
          <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/platform/54003.rdf"
           xlink:title="33AT" xlink:actuate="onRequest">R/V Atlantis</gmx:Anchor>
        </gmd:code>
      </gmd:MD_Identifier>
    </gmi:identifier>
    <gmi:description>
      <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/platform/54003.rdf" xlink:title="R/V Atlantis" xlink:actuate="onRequest">vessel</gmx:Anchor>
    </gmi:description>
    <gmi:instrument gco:nilReason="unknown"/>
  </gmi:MI_Platform>
</gmi:platform>
            <gmi:plan>
              <gmi:MI_Plan>
                <gmi:status>
                  <gmd:MD_ProgressCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_ProgressCode" codeListValue="completed"/>
                </gmi:status>
                <gmi:citation>
                  <gmd:CI_Citation>
                    <gmd:title>
                      <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/deployment/984569.rdf" xlink:title="Cruise" xlink:actuate="onRequest">AT50-24</gmx:Anchor>
                    </gmd:title>
                    <gmd:date gco:nilReason="unknown"/>
                    <gmd:citedResponsibleParty>
                      <gmd:CI_ResponsibleParty>
                      <gmd:individualName>
                          <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/person/51242.rdf" xlink:actuate="onRequest">Lisa A. Levin</gmx:Anchor>
                        </gmd:individualName>
                        <gmd:organisationName>
                          <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/affiliation/26.rdf" xlink:title="Affiliation" xlink:actuate="onRequest">University of California-San Diego Scripps</gmx:Anchor>
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                        <gmd:role>
                        <gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="principalInvestigator"/>
                      </gmd:role>
                      </gmd:CI_ResponsibleParty>
                    </gmd:citedResponsibleParty>
                   </gmd:CI_Citation>
                </gmi:citation>
              </gmi:MI_Plan>
            </gmi:plan>
            </gmi:MI_Operation>
      </gmi:operation><gmi:platform>
  <gmi:MI_Platform>
    <gmi:citation>
     <gmd:CI_Citation>
       <gmd:title>
         <gmx:Anchor xlink:href="http://www.whoi.edu/page.do?pid=8143" xlink:actuate="onRequest">R/V Atlantis</gmx:Anchor>
       </gmd:title>
       <gmd:date gco:nilReason="unknown"/>
     </gmd:CI_Citation>
    </gmi:citation>
    <gmi:citation>
     <gmd:CI_Citation>
       <gmd:title>
         <gmx:Anchor xlink:href="http://vocab.nerc.ac.uk/collection/C17/current/33AT" xlink:actuate="onRequest">Community Standard Description</gmx:Anchor>
       </gmd:title>
       <gmd:date gco:nilReason="unknown"/>
     </gmd:CI_Citation>
    </gmi:citation>
    <gmi:identifier>
      <gmd:MD_Identifier>
        <gmd:authority>
          <gmd:CI_Citation>
            <gmd:title>
              <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/authority/1.rdf" xlink:actuate="onRequest">International Council for the Exploration of the Sea</gmx:Anchor>
            </gmd:title>
            <gmd:date gco:nilReason="unknown"/>
          </gmd:CI_Citation>
        </gmd:authority>
        <gmd:code>
          <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/platform/54003.rdf"
           xlink:title="33AT" xlink:actuate="onRequest">R/V Atlantis</gmx:Anchor>
        </gmd:code>
      </gmd:MD_Identifier>
    </gmi:identifier>
    <gmi:description>
      <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/platform/54003.rdf" xlink:title="R/V Atlantis" xlink:actuate="onRequest">vessel</gmx:Anchor>
    </gmi:description>
    <gmi:instrument gco:nilReason="unknown"/>
  </gmi:MI_Platform>
</gmi:platform>
          </gmi:MI_AcquisitionInformation>
  </gmi:acquisitionInformation>
</gmi:MI_Metadata>
