Figure 1
Crossref API call (https://api.Crossref.org/works/10.1007/s00244-020-00745-8) indicating Crossref structural metadata contains references.
Figure 2
Crossref API call (https://api.Crossref.org/works/10.1007/s00244-020-00745-8) indicating the data DOI is listed in the ‘doi’ element in the reference of the Crossref structural metadata.
Figure 3
Overview of Crossref analysis method demonstrating how publications were subset and data DOIs were identified in Crossref structural metadata.
Figure 4
Overview of the xDD analysis method demonstrating how publications were subset and data DOIs mentions were identified in the full text of publications indexed in xDD.
Figure 5
Percentage of publications with indexed Crossref reference(s) in their Crossref structural metadata by publication year.
Figure 6
Percentage of publications with indexed Crossref references that cite or do not cite their associated data DOI in their Crossref structural metadata by publication year.
Figure 7
Publications subset by Crossref and xDD analysis method results, demonstrating the percentage of publications that mention a data DOI in their full text and/or cite a data DOI in their Crossref structural metadata references.
Figure 8
Percentage of publications with full text indexed in xDD with and without data DOI mentioned by publication year.
Figure 9
Percentages of publications with full text indexed in xDD that mention or do not mention their associated data DOI (see publisher abbreviations table above for publisher names). **Indicates publishers with data policies encouraging either a data availability statement or data citations in their reference lists.
Table 1
Information on data policies for top 10 publishers of publications in analysis dataset and publishers with full text indexed in xDD. *For publishers with different data availability policy levels, the most lenient policy level is documented.
| PUBLISHER | NUMBER OF PUBLICATIONS IN ANALYSIS DATASET | DATA AVAILABILITY STATEMENTS | DATA CITATIONS IN REFERENCES LIST | LINK TO POLICY |
|---|---|---|---|---|
| Regional Euro-Asian Biological Invasions Centre Oy (REABIC) | 29 | Not Mentioned | Not Mentioned | None Found |
| Oxford University Press (OUP) | 34 | Not Mentioned* | Not Mentioned | https://academic.oup.com/pages/open-research/research-data |
| Frontiers Media SA | 49 | Required | Required | https://www.frontiersin.org/guidelines/policies-and-publication-ethics |
| American Chemical Society (ACS) | 58 | Encouraged* | Encouraged* | https://publish.acs.org/publish/data_policy |
| Public Library of Science (PLoS) | 69 | Required | Encouraged | https://journals.plos.org/plosone/s/data-availability |
| MDPI | 132 | Required | Not Mentioned | https://www.mdpi.com/ethics |
| American Geophysical Union (AGU) | 135 | Required | Required | https://www.agu.org/Publish-with-AGU/Publish/Author-Resources/Data-and-Software-for-Authors |
| Springer Science and Business Media LLC (SSBM) | 234 | Required | Not Mentioned | https://www.springer.com/gp/editorial-policies/data-availability-statement |
| Wiley | 521 | Encouraged* | Encouraged* | https://authorservices.wiley.com/author-resources/Journal-Authors/open-access/data-sharing-citation/data-sharing-policy.html |
| U.S. Geological Survey (USGS) | 1237 | Not Mentioned | Required | https://www.usgs.gov/office-of-science-quality-and-integrity/fundamental-science-practices-fsp-guide-data-releases-or |
Table 2
The number of publications with and without indexed references for each of the top 10 publishers.
| PUBLISHER | PUBLICATIONS WITH INDEXED REFERENCES | PUBLICATIONS WITHOUT INDEXED REFERENCES |
|---|---|---|
| American Chemical Society (ACS) | 58 | 0 |
| American Geophysical Union (AGU) | 135 | 0 |
| Frontiers Media SA | 49 | 0 |
| MDPI | 131 | 1 |
| Oxford University Press (OUP) | 34 | 0 |
| Public Library of Science (PLoS) | 69 | 0 |
| Regional Euro-Asian Biological Invasions Centre Oy (REABIC) | 0 | 29 |
| Springer Science and Business Media LLC (SSBM) | 234 | 0 |
| U.S. Geological Survey (USGS) | 0 | 1,236 |
| Wiley | 517 | 4 |
Figure 10
Percentages of publications with data DOIs cited and not cited in the publication’s Crossref structural metadata for the eight out of the top ten publishers with Crossref references (see publisher abbreviations table above for publisher names). **Indicates publishers with data policies requiring data citations in their reference lists. *Indicates publishers with data policies encouraging data citations in their reference lists.
| TERM | ABBREVIATION |
|---|---|
| White House Office of Science and Technology Policy | OSTP |
| Office of Management and Budget | OMB |
| Office of Science Quality and Integrity | OSQI |
| U.S. Geological Survey | USGS |
| Trusted Digital Repository | TDR |
| Digital Object Identifier | DOI |
| USGS Fundamental Science Practices | FSP |
| Joint Declaration of Data Citation Principles | JDDCP |
| eXtract Dark Data | xDD |
| Application Programming Interface | API |
| PUBLISHER NAME | ABBREVIATION |
|---|---|
| American Chemical Society | ACS |
| American Geophysical Union | AGU |
| Frontiers Media SA | FM |
| Geological Society of America | GSA |
| Hindawi Limited | HL |
| Informa UK Limited | Informa |
| MDPI AG | MDPI |
| Oxford University Press (OUP) | OUP |
| Public Library of Science | PLoS |
| Regional Euro-Asian Biological Invasions Centre Oy | REABIC |
| Springer Science and Business Media LLC | SSBM |
| U.S. Geological Survey | USGS |
| Wiley | Wiley |