Year of compilation: 2014

Site description
Key biodiversity

IBA Trigger species: Chatham Island Shag, Pitt Island Shag, Fairy Prion, Grey-backed Storm Petrel, Chatham Oystercatcher, Chatham Snipe, Shore Plover, Chatham (Forbes') Parakeet, Red-fronted Parakeet (Chatham Island Red-crowned Parakeet), Black Robin

Besides the trigger species the following species are confirmed or likely to be breeding: Little Penguin, Black-winged petrel, Sooty Shearwater, Subantarctic Little Shearwater, Broad-billed Prion, White-faced Storm Petrel, Common Diving Petrel, Brown Skua, Southern Black-backed Gull, Red-billed Gull, White-fronted Tern, White-faced Heron, Mallard, Australasian Harrier, Welcome Swallow, NZ Pipit, Shining Cuckoo, Silvereye, Chatham Island Warbler, Chat-ham Island Tomtit, Chatham Island Fantail, Chatham Island Tui, Skylark, Hedge Sparrow, Blackbird, Song Thrush, Chaffinch, Redpoll, Starling.

Other species recorded: Leach’s Storm Petrel (Rabbit Island)

Pressure/threats to key biodiversity

The islands are pest and disease-free . Access to Mangere Island is strictly limited. Other islands including Little Mangere
Tapuaenuku are privately owned and access is limited. Also, all islands are steep to extremely steep and difficult to access.
However, reinvasion is a constant threat, particularly from any vessels anchored close to the islands.

Human disturbance – No
Predation by alien species – No
Habitat loss or degradation – No
Contamination – No
Natural disaster – No
Parasite or pathogen - No
Other – No

Protected areas

Mangere Island - Nature Reserve - Protected area contained by site

Recommended citation
BirdLife International (2021) Important Bird Areas factsheet: Mangere. Downloaded from on 28/01/2021.