Host Neil Collins was retiring next week, and breakfast show host Owen Rooney would host an extended show until noon, MediaWorks said.
It is understood a change proposal has been released to other staff.
''There will be some staffing changes as a result of these developments but we are not able to discuss these at this time.''
One proposal is understood to involve switching to Magic FM at noon, but MediaWorks refused to comment on that.
In a year of upheaval at the historic radio station, it was shunted to a different FM frequency in April to make way for Magic FM, but that may be about to change.
''We are about to invest in moving a transmitter to another location as well as freeing up [an] FM frequency which will see Radio Dunedin broadcasting FM into areas of Dunedin and all of Mosgiel,'' a spokeswoman said.
The low-power frequency it has shifted to is not available outside the central city, affecting some long-time listeners.
The Otago Radio Association volunteers who took responsibility for programming at certain times would continue to contribute to the station, the spokeswoman said.
It was unclear if they were in any way affected by the changes.
In television, there is also uncertainty over whether MediaWorks will continue to support two TV3 reporters in the South.
The second Dunedin position is vacant at present.
In the 1970s, Dunedin had about 24 radio and television journalists and ''only about two frequencies, and now it's the other way around'', media commentator Tom Frewen, of Wellington, said when contacted yesterday.
The funding that supported that system was less than what was doled out today in contestable public broadcasting funds to television production companies, Mr Frewen said.
''It's just a question of how it's organised.
''In order to get local news back, it's a political decision.''
News coverage was now largely determined by the needs of national advertisers, and regional news had suffered.
''Commercial broadcasting winds up catering to the centre. It doesn't actually add to choice, it reduces choice, by giving you two or three of the same thing.
''It's very unfashionable to talk about going back to the past. But that's really what we have to do.''
News served a democratic purpose, and in some towns reporters no longer even covered local council meetings.
''It's all right for Dunedin because you've got a good newspaper there.
''We need to go back to having local news, simply for democratic purposes. You really need to have that coverage of the local institutions in order for people to be able to vote.''
Media commentator Jim Tucker, of New Plymouth, said Radio New Zealand was maintaining a provincial radio presence, but was increasingly on its own in the regions.
The commercial radio reporters who remained in the regions had increasingly large territories to cover, he said.
