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The New Zealand population is currently increasing after reaching a low of about birds in the s. The population increased to about birds in and birds in , largely reflecting increases in numbers on high country lakes in Otago and the Mackenzie Basin and coastal Canterbury.
While there has been no recent census, numbers in Otago alone now exceed birds. The combined population in Australia and New Zealand is likely to be less than birds.
In New Zealand, crested grebes are threatened because of predation by introduced mammals such as stoats and ferrets, loss of shore-line nesting habitat, the establishment of hydro-electric power schemes and disturbance by power boating and perhaps other recreational activities on lakes. Competition with introduced fish may have been a factor causing early declines.
Some predator control has been initiated around lakes in order to improve nesting success.
Artificial nesting platforms have been used with great success to establish a population at Lake Wanaka. Nesting occurs between September and March. The nest is generally made of sticks and waterweeds and floats on the water, but is often attached to willow branches or reeds. The female lays eggs that are covered with weed when not being incubated.
Both sexes incubate and they both care for the young, which are often carried on the back when small. Some crested grebes migrate locally in winter, moving from small lakes when they freeze to larger ones or moving from the high country to coastal Canterbury. Jensen, L. The distribution and numbers of Australasian crested grebe kamana in New Zealand, January Marchant, S. Handbook of Australian, New Zealand and Antarctic birds. Oxford University Press: Melbourne. O'Donnell, C. Head plumage variation and winter plumage of the southern crested grebe.
Food and feeding behaviour of the southern crested grebe on the Ashburton lakes. Southern crested grebes on a lowland coastal lake in winter. Status survey and conservation action plan. Sagar, P. The distribution and numbers of crested grebe in New Zealand Seasonal movements and population of the southern crested grebe in Canterbury.
In Miskelly, C. New Zealand Birds Online. A relatively large diving bird with slender neck, sharp black bill and a head with a distinctive black double crest and bright chestnut and black cheek frills.
It carries its young on its back when swimming. Pair at nest under overhanging willows. Calls from pair on nest.
Calls of juvenile and altercation between two adults. Show more fewer sounds Checklist of the birds of NZ. Bird distribution in NZ. This file is Field guide to the birds of NZ. Birds of NZ - Locality guide.
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