Porphyrio hochstetteri is endemic to New Zealand. Subfossils indicate that it was once widespread in the North and South Islands, but when 'rediscovered' in 1948, it was confined to the Murchison Mountains in Fiordland (c.650 km2)3 and numbered just 250-300 birds7. This population has fluctuated between 100-160 birds for the last 20 years8 and is thought to be at carrying capacity16. Translocated populations (1984-1991) exist on four offshore (predator-free) islands - Kapiti, Mana, Tiritiri Matangi and Maud - but have increased only slowly (55 adults in 19986) due to low hatching and fledging rates related to the level of inbreeding of the female of a given pair3,12. The population on Tiritiri Matangi and other small islands may be close to carrying capacity14.
No one has provided updates yet.