The Department of Conservation (DOC) says jobs losses can be expected in a new review of staffing across the country.
DOC is reviewing its functions in science and technical support, legal, planning, land management and other staff areas, though it says ranger positions will not be affected.
It says that, like all Government departments, it is looking at more effective and efficient ways of working.
The department says there is no target on job numbers nor a dollar savings figure and it is too early to say what the impact of the review will be.
However Radio New Zealand has been told that up to 150 jobs are at risk, including those of scientists.
DOC says about 30 jobs have gone in the last two years following a finance services review and an amalgamation of the Tongariro and Taupo offices.
It expects the latest review will take until September.