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Configure how Pathauto creates aliases at Administration » Configuration » Search and Metadata » URL Aliases » Patterns (admin/config/search/path/patterns):

The Default path pattern for Islandora Paths will apply regardless of the content model. Leave this field blank to create a path pattern for the desired Content Model.  

Aliases can include the object's pid ([fedora:pid]), the Fedora label ([fedora:label]), the namespace ([fedora:namespace]), and/or the pid without the namespace ([fedora:shortpid]). See the documentation for Pathauto for more information on creating aliases.

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