You own the copyright in anything you create
As explained elsewhere in these pages, copyright in New Zealand is automatic. The moment you create something original in a fixed form or record it in some way you have the rights associated with that thing: there is no need to include the copyright symbol or your name, though of course this helps.
Remember, though, that a work can contain many different copyrights, so these rights would only apply to the parts you created. For example: you write a blog post, and use a photograph from Flikr, which has been licenced with a Creative Commons attribution licence. You don't own the copyright in the photograph - that remains with the creator - but you own the copyright in anything you create, which gives you the exclusive right to copy, publish, perform, show, communicate, adapt/arrange the material in question or to authorise such uses.
Staff and the University's Intellectual Property Rights Policy
The University of Otago's Intellectual Property Rights Policy makes clear that the University "does not claim copyright in work or material produced by University staff in furtherance of their general employment obligations to teach and to undertake scholarly research, and agrees that copyright in such work or material is owned by the University staff members who produce it" (Section 3). So, you own the copyright in any material you produce yourself, whether this is an article, teaching resource or whatever, though there are some things you should note, as detailed below.
Journals / Other publishing
So, if you followed the explanation above, in theory you will own the copyright in any research you might publish while employed by the University (unless that research was funded by an external research grant and the contract for that stipulates otherwise - read Section 6 of the IP policy). However, most agreements you make with journals require that you grant them copyright in the article and will place varying degrees of limitation on what you can do with copies of the material in question. There are open access journals that do not place such restrictions on your research publications. Thus, for journal articles - and the same is true for any other form of formal publishing - whether you own the copyright in your work will depend on the agreement you make with the publisher. (Read about your obligations when using others' material in your own research).
As noted above, under the IP policy the University does not claim copyright in teaching and research materials you produce while in its employ. In other words you can 'take them with you' when you leave. Note, though, that the University is entitled to use any materials you produce in the course of your employment even after you leave the University and that you can't give any such materials to another institution without the University's consent while working here. Read Section 4 of the IP policy for the full wording. And read about your obligations when using others' material in your own teaching materials.
Web publishing - wikis, blogs, YouTube etc.
See the dedicated page on this subject.
General principles when creating material of your own
- Remember that if you use material that is not yours within something you create then you need to be sure you are able to do so.