On January 1st, 2019, BioOne has migrated their journals to a new platform and this has caused (hopefully) temporary problem with link re-directs. When you currently search for BioOne journals (such as Acta Ornithologica) on the A-Z E-journal list and click on the BioOne link in the SFX menu you will land at a Page Not Found page on the new BioOne platform.
The vendor is aware of this problem and has notified ExLibris as the problem is actually on their end. Both vendors are currently working on a solution.
In the meantime we still continue to have access to BioOne journals - users just need search for a specific journal title on the new BioOne platform in order to get to the journal website.