New Zealand Sub-Antarctic Islands

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New Zealand Sub-Antarctic Islands: A Unique Biodiverse Haven in the Southern Ocean

The New Zealand Sub-Antarctic Islands, a collective designation of five island groups, constitute a unique and significant part of the New Zealand outlying islands. This archipelago, located in the Southern Ocean southeast of New Zealand, is recognized globally as a UNESCO World Heritage Site due to its exceptional biodiversity, high levels of productivity, and endemic species.

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UNESCO Description of the World Heritage Site

The New Zealand Sub-Antarctic Islands consist of five island groups (the Snares, Bounty Islands, Antipodes Islands, Auckland Islands and Campbell Island) in the Southern Ocean south-east of New Zealand. The islands, lying between the Antarctic and Subtropical Convergences and the seas, have a high level of productivity, biodiversity, wildlife population densities and endemism among birds, plants and invertebrates. They are particularly notable for the large number and diversity of pelagic seabirds and penguins that nest there. There are 126 bird species in total, including 40 seabirds of which eight breed nowhere else in the world.

UNESCO Justification of the World Heritage Site

Criterion (ix): Isolation, climatic factors, and seven degrees of latitudinal spread have combined to significantly influence the biota of the islands. Consequently they provide scientific insights into the evolutionary processes affecting widely-spread oceanic islands, varying from relatively mature endemic forms to relatively immature taxa, constituting a fascinating laboratory for the study of genetic variation, speciation and adaptation, particularly in the insulantarctic biogeographic province. Evolutionary processes, such as the loss of flight in birds and invertebrates, offer unique opportunities for research into island dynamics and ecology. Another outstanding feature is the preponderance of ‘megaherbs’ within the plant biodiversity. These large herbs, often with brightly coloured flowers are considered to display unique evolutionary adaptation to the distinctive sub-antarctic climate – with its cloud cover (and lack of solar radiation), lack of frosts, strong winds, and high nutrient levels (derived from seabird transference of nutrients).

Criterion (x): The NZSAI, and the ocean that surrounds and links them, support an extraordinary and outstanding array of endemic and threatened species among the marine fauna, land birds, and invertebrates. As a group they are distinct from all other island groups, having the highest diversity of indigenous plants and birds. Of particular significance: the most diverse community of seabirds in the world with eight species endemic to the region; including four species of albatross, three species of cormorants (one of which, the Bounty Island Shag, is the world’s rarest cormorant) and one species of penguin; 15 endemic land birds including snipe, parakeets and teal; breeding sites of the world’s rarest sea lion (the New Zealand (or Hooker’s) sea lion); and a significant breeding population of the southern right whale. Together with neighbouring Macquarie Island, the NZSAI represent a Centre of Plant Diversity and have the richest flora of all the sub-antarctic islands with 35 endemic taxa. The “megaherbs’ are unique to the NZSAI and Macquarie Island. The Snares Group and two of the Auckland Islands are of particular biodiversity conservation significance due to the absence of any human and exotic species modification.

Encyclopedia Record: New Zealand Subantarctic Islands

The New Zealand Subantarctic Islands comprise the five southernmost groups of the New Zealand outlying islands. They are collectively designated as a UNESCO World Heritage Site.

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IUCN World Heritage Outlook

The 2025 Conservation Outlook on New Zealand Sub-Antarctic Islands reports the following assessment:

Source: International Union for Conservation of Nature (IUCN) · View assessment