World Heritage Identification Number: 877
World Heritage since: 1998
Category: Natural Heritage
WHE Type: Natural Landscapes & Geographic Features
Transboundary Heritage: No
Endangered Heritage: No
Country: 🇳🇿 New Zealand
Continent: Oceania
UNESCO World Region: Asia and the Pacific
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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.
More to come…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.Additional Site Details
Area: 76,458 hectares
Number of Components: 5
(x) — Contains most important habitats for biodiversity
Coordinates: -50.75 , 166.1044444
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
World Heritage Research
Discover scientific research and academic studies that deepen our understanding of New Zealand Sub-Antarctic Islands from its history and significance to its conservation, management, and contemporary challenges.
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A Surprising Diversity of Aquatic Oligochaetes (Annelida: Clitellata) on Campbell Island/Motu Ihupuku (New Zealand), With a Checklist of Sub‐Antarctic and Antarctic Microdrile Oligochaetes
A surprising diversity of aquatic oligochaetes (Annelida: Clitellata) has been discovered on Campbell Island/Motu Ihupuku, New Zealand. The study, conducted during the 2010/11 austral summer as part of the Campbell Island Bicentennial Expedition, recorded 19 species, including six Naididae, nine Enchytraeidae, and four Phreodrilidae, bringing the total number of microdrile species known from the island to 20. At least nine species are endemic to Campbell Island, with two new genera and four new species described. The fauna exhibits biogeographic affinities with other Southern Ocean/sub-Antarctic islands and high-latitude regions of southern continents, such as Macquarie Island and Tasmania. Species richness on Campbell Island far exceeds that of Macquarie Island, where only six species have been documented. The study highlights the need for further research to better understand the origins of this diversity and compare it with other islands.
Pinder, A. M., Schmelz, R. M., McMurtrie, S., & James, A. (2026). A Surprising Diversity of Aquatic Oligochaetes (Annelida: Clitellata) on Campbell Island/Motu Ihupuku (New Zealand), With a Checklist of Sub‐Antarctic and Antarctic Microdrile Oligochaetes. New Zealand Journal of Marine and Freshwater Research, 60(3). Portico. https://doi.org/10.1002/nzm2.70051
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Evidence of eastern rockhopper penguin feeding on a key commercial arrow squid species
Research reveals that eastern rockhopper penguins around Campbell Island, New Zealand, have incorporated the commercially valuable arrow squid Nototodarus sloanii into their diet for the first time during the 2012–13 breeding season. Stable isotope analysis of cephalopods in penguin diets showed ecological stability for Moroteuthopsis ingens, while shifts were observed in Octopus campbelli, possibly due to warmer oceanic temperatures. This suggests potential changes in cephalopod biodiversity in the Pacific sector of the Southern Ocean, underscoring the need for further study on this region's ecological dynamics.
Guímaro, H. R., Thompson, D. R., Morrison, K. W., Fragão, J., Matias, R. S., & Xavier, J. C. (2025). Evidence of eastern rockhopper penguin feeding on a key commercial arrow squid species. Polar Biology, 48(1). https://doi.org/10.1007/s00300-025-03358-w
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Spatial Modelling Approaches for Estimating Richness of Benthic Invertebrates Throughout New Zealand Waters
Macro-ecological models (MEMs) outperform stacked species distribution models (S-SDMs) for mapping benthic invertebrate richness in New Zealand waters, offering more nuanced and accurate predictions. Using over 120,000 occurrence records of 207 genera, the study compared both approaches, revealing that S-SDMs were hindered by spatial and catchability biases in the data. The MEM approach successfully identified high-richness areas, including parts of the Chatham Rise, sub-Antarctic regions, southern South Island continental shelf, northeast North Island coast, East Cape, and the Kermadec, Lau-Colville, and Macquarie Ridges. These findings provide critical insights for marine spatial planning, emphasizing the importance of robust modelling techniques when systematic sampling is limited.
Brough, T., Stephenson, F., Leunissen, E., & Lundquist, C. (2025). Spatial Modelling Approaches for Estimating Richness of Benthic Invertebrates Throughout New Zealand Waters. Diversity and Distributions, 31(2). Portico. https://doi.org/10.1111/ddi.70006
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Tracing the biogeographic history of the world's most isolated insular floras
A new study reveals that the New Zealand Sub-Antarctic Islands, one of Earth's most isolated regions, have maintained high biological connectivity with southern landmasses like Australia, New Zealand, and South America since the Miocene. Contrary to expectations, long-distance dispersal—not tectonic vicariance—has been the primary mechanism for plant colonization, facilitated by eastward-moving marine and wind currents, short-term weather systems, or bird dispersal. Phylogenetic reconstruction, divergence time estimation, and Bayesian biogeographic analyses of seven vascular plant lineages show that most species diverged during the Plio-Pleistocene, with crown ages predating the Last Glacial Maximum, indicating these islands acted as biodiversity refuges. The findings highlight their dual role as both refugia and sources of (re)colonization, emphasizing the urgent need for conservation planning in this remote sub-Antarctic region.
Aguado‐Lara, Á., Sanmartín, I., Le Roux, J. J., García‐Verdugo, C., Molino, S., Convey, P., Jansen van Vuuren, B., & Mairal, M. (2025). Tracing the biogeographic history of the world’s most isolated insular floras. Journal of Systematics and Evolution, 63(4), 952–973. Portico. https://doi.org/10.1111/jse.13170
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Avian Influenza Virus Surveillance Across New Zealand and Its Subantarctic Islands Detects H1N9 in Migratory Shorebirds, but Not 2.3.4.4b HPAI H5N1
A comprehensive avian influenza virus surveillance study across New Zealand and its subantarctic islands detected no presence of highly pathogenic avian influenza (HPAI) H5N1, a significant finding given the potential catastrophic impact on local wildlife. The study analyzed 700 wild aquatic birds from 33 species using metatranscriptomic techniques, focusing on the annual 2023-2024 migration period. While no H5N1 was found, a single detection of H1N9 in red knots (Calidris canutus) was noted. This research establishes a critical baseline for expanding avian influenza monitoring in New Zealand, providing valuable data to assess the risk and prepare for future outbreaks.
Waller, Stephanie J., Wierenga, Janelle R., Heremia, L., Darnley, Jessica A., de Vries, I., Dubrulle, J., Robinson, Z., Miller, Allison K., Niebuhr, Chris N., Melville, David S., Schuckard, R., Battley, Phil F., Wille, M., Alai, B., Cole, R., Cooper, J., Ellenberg, U., Elliott, G., Faulkner, J., et al. (2025). Avian Influenza Virus Surveillance Across New Zealand and Its Subantarctic Islands Detects H1N9 in Migratory Shorebirds, but Not 2.3.4.4b HPAI H5N1. Influenza and Other Respiratory Viruses, 19(4). Portico. https://doi.org/10.1111/irv.70099
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Under what climate conditions were the New Zealand subantarctic islands glaciated?
Mountain glaciers in the New Zealand subantarctic islands, particularly those in the Auckland and Campbell archipelagos, provide critical insights into past climate conditions. A study using a 2D glacier model reveals that these islands were glaciated under significantly cooler temperatures—6 to 7 °C below mid-20th century levels for recent glaciation and more than 8 °C lower for ice cap coverage, assuming present-day precipitation. The research also highlights the sensitivity of glacier mass balance to summer temperatures, with increased temperature seasonality requiring further reductions in temperature to achieve equivalent ice volumes. These findings refine our understanding of glaciation in the southwest Pacific sector of the Southern Ocean and offer a framework for evaluating global climate model simulations. However, precise dating of past glaciation events remains necessary to fully interpret the climatic implications.
Eaves, S., Anderson, B., & Gray, R. (2025). Under what climate conditions were the New Zealand subantarctic islands glaciated? Open Access Te Herenga Waka-Victoria University of Wellington. https://doi.org/10.25455/WGTN.30615029
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Trans-equatorial migration links oceanic frontal habitats across the Pacific Ocean: year-round movements and foraging activity of a small gadfly petrel
Stejneger’s petrels, endemic to the Juan Fernández Islands, undertake an unprecedented trans-equatorial migration spanning 54,725 km across the Pacific Ocean, linking oceanic frontal habitats from the Sub-Antarctic Front to regions near Hawaii and Japan. This triangular migration pattern, unique among seabirds, involves a detour toward New Zealand before heading east at 40–50°S, likely leveraging Antarctic circumpolar winds. The study used geolocator-immersion loggers over two years to track year-round movements, phenology, habitat use, and activity patterns of 10 individuals. Birds spent >75% of their time flying during breeding and migration but reduced flight activity during non-breeding, possibly due to feather molt. Their strong preference for oceanic frontal regions, particularly the North Pacific Transition Zone Chlorophyll Front, underscores the critical need to protect these remote High Seas habitats.
Clay, T. A., & Brooke, M. d. L. (2024). Trans-equatorial migration links oceanic frontal habitats across the Pacific Ocean: year-round movements and foraging activity of a small gadfly petrel. Marine Biology, 171(2). https://doi.org/10.1007/s00227-023-04373-3
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