The Prime Minister has received multiple threats from anti-1080 protesters - including one death threat.

Threats aimed at Department of Conservation staff have been increasing in recent months, and Jacinda Ardern has also been a target.

A spokesperson for the Prime Minister says her primary concern is for the front line staff at DOC, who are subjected to threats of violence while simply going about their daily work.

They say it's important we keep political disagreement civil, and not allow it to descend into threats or acts of violence.