Normally, the author of a work is the first owner of the copyright (Copyright Act, s.13(1)). However, there is an exception in the case of works made in the course of employment. Section 13(3) reads as follows:
s13(3) Where the author of a work was in the employment of some other person under a contract of service or apprenticeship and the work was made in the course of his employment by that person, the person by whom the author was employed shall, in the absence of any agreement to the contrary, be the first owner of the copyright, but where the work is an article or other contribution to a newspaper, magazine or similar periodical, there shall, in the absence of any agreement to the contrary, be deemed to be reserved to the author a right to restrain the publication of the work, otherwise than as part of a newspaper, magazine or similar periodical. [emphasis added]
The "agreement to the contrary" could be a specific agreement that relates to the particular work, or it could be the terms of a more general employment agreement. At the University of Alberta, the recently revised (June 2016) copyright terms of the AASUA (Association of Academic Staff University of Alberta) collective agreements are available here. AASUA's related FAQ is available here.