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Echinoderms were collected during two National Science Foundation (NSF) research cruises: NBP12-10 aboard the U.S. R\/V Nathanial B. Palmer<\/em> (Jan 1 - Feb 9, 2013) and LMG13-12 aboard the U.S. R\/V Laurence M. Gould<\/em> (Nov 22 to Dec 20, 2013) around western Antarctica. Individuals were collected using a Blake Trawl (1.5 m width) and bottom temperatures were collected using Seabird SBE3 Oceanographic temperature sensors on a CTD rosette.<\/p>\n To prepare skeletal material, intact individuals or body components were placed in a drying oven for 24 hr at 35 \u00b0C and then digested in a 10% NaClO solution to remove all tissue (McClintock et al. 2011). Cleaned skeletal elements were rinsed generously with distilled water, vacuum dried, and then placed in a drying oven for 24 hrs. Skeletal material from intact individuals or body components was then ground into a fine powder using an agate mortar and pestle with the addition of several mL of 95% ethanol. The resulting slurry was air dried for 12 hrs and the subsequent powder used in mineralogical analysis.<\/p>\n Mg\/Ca ratios were determined by X-ray diffraction (XRD) using a Philips X\u2019Pert Analytical X-ray diffraction system (PANalytical B.V., Almelo, Netherlands). The system was set to run at 45kV and 40mV with a 2\u0398 angular scan range of 27\u02da to 32\u02da. The scan speed was 2 s\/step with a step size of 0.02 to obtain accurate measurements of the calcite peak occurring at 2\u0398 = 29.5 \u02da-30.2 \u02da. Resulting diffraction patterns was used to determine the Mg\/Ca ratio following the equation given in Ries (2011), where \u201c2\u0398\u201d is the measured location of the calcite peak on each sample\u2019s x-ray diffraction patterns:<\/p>\n Mg\/Ca = 0.17881(2\u0398)2 \u2013 10.20926(2\u0398) + 145.59368<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/ocean-data.org\/schema\/hasBriefDescription":[{"@value":"Mg\/Ca ratios","@language":"en-US"}],"http:\/\/www.w3.org\/2000\/01\/rdf-schema#label":[{"@value":"Duquette et al. 2018: Mg\/Ca ratios","@type":"xsd:string"}],"http:\/\/purl.org\/dc\/terms\/identifier":[{"@value":"727518","@type":"xsd:int"}],"http:\/\/purl.org\/dc\/terms\/title":[{"@value":"Duquette et al. 2018: Mg\/Ca ratios"}],"http:\/\/purl.org\/dc\/terms\/date":[{"@value":"2018-02-16T16:16:36-05:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/created":[{"@value":"2018-02-16T16:16:36-05:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/modified":[{"@value":"2023-07-07T16:10:26-04:00","@type":"xsd:dateTime"}],"http:\/\/rdfs.org\/ns\/void#inDataset":[{"@id":"http:\/\/www.bco-dmo.org\/"}],"http:\/\/ocean-data.org\/schema\/namedGraph":[{"@value":"urn:bcodmo:dataset:727518","@type":"xsd:token"}],"http:\/\/ocean-data.org\/schema\/osprey_page":[{"@id":"https:\/\/www.bco-dmo.org\/dataset\/727518"}],"http:\/\/ocean-data.org\/schema\/identifier":[{"@value":"_:Identifier727518"}],"http:\/\/ocean-data.org\/schema\/datasetTitle":[{"@value":"Mg\/Ca ratios in Echinoderms collected near western Antarctica on NBP12-10 (Jan. 1 to Feb. 9, 2013) and LMG13-12 (Nov. 22 to Dec. 20, 2013)","@language":"en-US"}],"http:\/\/ocean-data.org\/schema\/abstract":[{"@value":"Mg\/Ca ratios in Echinoderms collected on NBP12-10 (Jan. 1 to Feb. 9, 2013) and LMG13-12 (Nov. 22 to Dec. 20, 2013) in Western Antarctica, Bellingshausen Sea to Ross Sea.","@language":"en-US"}],"http:\/\/purl.org\/dc\/terms\/rights":[{"@id":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"http:\/\/ocean-data.org\/schema\/deprecated":[{"@value":"false","@type":"xsd:boolean"}],"http:\/\/ocean-data.org\/schema\/temporalExtent":[{"@value":"_:temporalExtent727518"}],"http:\/\/ocean-data.org\/schema\/spatialCoverage":[{"@value":"_:spatialCoverage727518"}],"http:\/\/purl.org\/dc\/terms\/bibliographicCitation":[{"@value":"McClintock, J. 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