Online encyclopaedia Wikipedia "lost" 49,000 of its volunteer editors in the first three months of 2009, University research suggests.
The figure compares with a loss of 4,900 over the same period in 2008.
The encyclopaedia-style website encourages editorial changes from everybody who comes to the site.
Wikimedia UK, a chapter of the organisation that operates Wikipedia, has denied that it means the site is struggling.
It says that it is seeking more expert contributors.
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