Australasian crested grebe/kāmana conservation
Widespread but declining
The Australasian crested grebe or kāmana are found on every continent in the world. Māori call the birds kāmana, and regard them as taonga/treasure.
They are found all over the South Island of New Zealand, and they are fully protected. They live on lakes of various sizes but require vegetation along the lake margins for nesting and shelter from rough weather. They attach their floating nests to underwater vegetation.
At least 100 South Island lakes once had grebes but there have been ongoing declines in Marlborough, the West Coast and in Fiordland. Only Canterbury and Otago remain as strongholds.
Kāmana have declined mainly due to introduced predators; and loss habitat loss through drainage of wetlands and the establishment of hydro schemes.
Animals like stoats, ferrets, cats, and raptors can prey on eggs and fledglings. Introduced fish and birds compete for food and breeding space.
Nests can be stranded or flooded by artificial fluctuations in lake levels. Motorised water craft can swamp nests and destroy eggs. and the noise can scare adult birds leaving eggs or chicks exposed to the cold or predators.
Lake Pearson wildlife refuge
Lake Pearson/Moana Rua in Canterbury has been designated a wildlife refuge to help protect the grebe. Their numbers appear to have remained stable here for several decades.
Wildlife refuge status is one of New Zealand’s highest forms of legal protection for terrestrial and aquatic wildlife habitats. This allows the Minister of Conservation to prohibit or restrict activities on the lake and its margins.
For instance, there are restrictions on motorised boats on the lake and together with predator control measures, this will hopefully allow grebes to increase their numbers in years to come.
You can help
When visiting grebe habitat, move quietly and carefully around lake edges.
Help protect our native birds
When visiting parks, beaches, rivers, and lakes
- Only take dogs to areas that allow them, and keep them under control.
- Check for pests when visiting pest-free islands.
- Leave nesting birds alone.
- Use available access ways to get to the beach.
- Avoid leaving old fishing lines on beaches or in the sea.
- Follow the water care code and local navigation bylaws.
- Don't drive on riverbeds, or keep to formed tracks if you have to.
Other ways to help
- Get your dog trained in avian awareness.
- Volunteer to control predators and restore bird habitats.
- Set predator traps on your property.
- Put a bell on your cat's collar and feed it well.