(CNN)As the internet evolves, webpages that were live years ago are frequently no longer available today. In some cases, that's for the best (so long, embarrassing MySpace profiles), but it is a concern when it comes to scientific research.
Dozens of scientific journals have vanished from the Internet, study found
A new study found that 176 open access journals from 47 countries have vanished from the Internet between 2000 and 2019, and nearly 900 "inactive" journals may be at risk of vanishing in the future.
The issue of insufficient preservation of the scholarly record online has been raised before, however "no one has really put out names of journals or tried to identify a quantity," said study co-author Mikael Laakso, an associate professor at Hanken School of Economics.
The study doesn't analyze why these specific journals disappeared, or their quality, but it found that over 50% of them had an academic affiliation. As far as topics, over 50% of the vanished journals were about social sciences and humanities, although health, physical science, mathematics and life sciences were also represented.
"There is usually an immense amount of time contributed by a lot of different people behind every article," from the authors, to the editors, all the way to peer-reviewers, Laakso told CNN.
"For all that work to be nullified and cut off from ever making an impact on the world, for such a trivial reason as not having a backup system in place for PDF files is not something that should be accepted," Laakso added.
The study, published as a pre-print, is available on arXiv, an open access archive of scholarly articles.
With little documentation available on what content falls offline, researchers said they had to do some "detective work" to gather data, something they believe speaks to the need for better tools to capture this phenomenon.
They tracked the presence of the journals in major bibliographic indexes such as the Directory of Open Access Journals and others, over the years. They said the process was like going through old phone books to see if, when a phone number is removed from the index, the users are still alive.
After narrowing down the list of titles that were no longer featured in indexes as years passed, they then sifted through thousands of webpages to figure out what had happened to each individual title, relying on tools such as the Internet Archive's Wayback Machine.
In terms of absolute numbers, the study finds that only a small proportion of open access journals disappeared within the past two decades, but the authors warn against reading that with optimism.
"We think that more journals might be at risk of vanishing in the future," Lisa Matthias, a Ph.D. candidate at the Free University of Berlin and a co-author of the study, told CNN.
The study identified 900 "inactive" journals that may be at risk of vanishing, since over three-quarters of the journals that ended up falling offline did so within 5 years from the last publication.
In an email to CNN, the Directory of Open Access Journals said the study "reinforces our view that DOAJ must help those journals, indexed with us, to preserve their content, and we need to find a model where, depending on their economic profile, the cost of doing so is not always passed back to the journal."
Why does digital content disappear from the internet? There are plenty of reasons, ranging from technological advances that make webpages obsolete, to Web hosting bills going unpaid.
"The average life of a webpage is 100 days before it's either changed or deleted," Brewster Kahle told CNN. Kahle is the founder of the Internet Archive, a non-profit organization that aims to be "the library for the Internet," as Kahle puts it.
"The Web is an ever-shifting set of sands," Kahle said.
The issue affects all kinds of digital content, but when it comes to scholarly literature, there are still gaps in knowledge about what is even out there to be saved.
The Internet Archive set out to find and archive all journal articles available online in 2018, and more recently, it received funding from the Mellon Foundation to pursue this goal, Kahle explained.
"By our analysis, 18%, or over 3 million, open access articles since 1945 are not independently archived, either by us or by other preservation organizations," Kahle said. The Internet Archive and the authors of the study on vanishing open access journals have joined forces to address the problem.
Historically, the role of preserving content for future generations rested with libraries, but in the digital age, the role of libraries has become much more complex, as the rising cost of commercial scholarly literature impacts their budgets.
Judy Ruttenberg, senior director of Scholarship and Policy at the Association of Research Libraries, told CNN that libraries have focused on this work since the 1990s, but all the while, "subs