No one owns any namespaces, although some people control them by convention (and we PAUSE maintainers don't break those conventions).

I don't see any reason that you shouldn't be able to use Bio::*. As long as you've publically announced your intention in the right places (and it sounds as if you have) and nobody objects, then use the name.

You can also post a note to modules @ perl . org (either manually or through the "Register Module" form on PAUSE. Our crack cadre of module namers and registars can give useful advice and guidance.