I'm in the mid stages of my PhD, working on 3/4 of the components of a major project in our group. A post-doc has just started working on the remaining 1/4 using protocols I established (to keep our work comparable). My supervisor has now reassigned a lot of my original work to the post-doc, and let them re-optimise protocols independently.
Now it's looking like I will have no authorship for the majority of the project, as the post-doc modified my protocols (which were meant to be consistent between us) and has taken over the bulk of my project.
What can I do to ensure I still get first-author publications out of my PhD? I have spoken with my supervisor who does not want to discuss authorship 'at this stage' and has been known to publish in the past without consulting other members of the group.