"Every season, I've witnessed it myself and had reports of people reading the signage, looking around to see if anyone's watching, and then do exactly the opposite to what we're asking – which is to just walk a little further and give the dotterels some space, peace and quiet.
"We don't enter the dotterels nesting areas ourselves, to having people traipsing right through is incredibly frustrating and hampering our ongoing efforts to protect them."
Dotterels face a number of threats from introduced predators, dogs and other birds, so humans intruding on their nesting areas is adding to the stress during nesting and breeding time.
Human intrusion causes dotterel chicks to scatter across a beach, putting them at risk of being killed by other territorial birds. Chicks can also be kept from regular feeding at the tide line, and without adequate food they can die from starvation as they are not fed by their parents.
The interaction between people and dotterels occurs because the birds nest above the high-tide mark, where humans like to sunbathe, walk or leave their belongings while they swim.
DoC will continue to monitor the dotterels' breeding sites around the Coromandel, and anyone found breaching the roped-off areas can face an $800 fine under the Wildlife Act.
Anyone who witnesses people intruding into a dotterel nesting site is urged to report it via 0800 DOC HOT, and include descriptions of those responsible and details of any vehicles they may have used.
The intrusions into the dotterel protection sites have been reported during Conservation Week when DoC's Coromandel and Hauraki districts put out a call for more people to become dotterel minders.