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               <gmd:keyword>
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            <gmd:MD_DigitalTransferOptions>
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                        <gmd:URL>https://data-package.ceh.ac.uk/data/1a1000a8-4e7e-4851-8784-94c7ba3e164f</gmd:URL>
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                                 <gmd:date>
                                    <gco:Date>2010-12-08</gco:Date>
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                  <gco:CharacterString>A systematic literature search was conducted to find data sources using Web of Science and Google Scholar (in June/July 2020). This used the following search term: (Earthworm* OR Oligochaeta OR Annelid* OR Lumbric* OR Clitellat*) AND (Diversity OR “Species richness” OR “OTU” OR Abundance OR individual* OR Density OR “tax* richness” OR “Number” OR Richness OR Biomass) AND (UK OR “United Kingdom” OR England OR Wales OR Scotland OR “NI” OR “Northern Ireland” OR “Ireland” OR “ROI”) Publications were selected and meta-data recorded if they contained location information and the presence of at least one species of earthworm or abundance/biomass data obtained from the field. Further publications were found through screening of review papers and contact with selected authors for additional information and resources, including published and unpublished datasets. In total, 257 data sources were compiled. Original sources (i.e. published papers, book chapters) could not be obtained for 17 studies at the time of compiling meta-data and are thus lacking any additional information.</gco:CharacterString>
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