Okarito kiwi

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Okarito kiwi
Okarito kiwi 2.jpg
Adult Okarito kiwi
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Infraclass: Palaeognathae
Order: Apterygiformes
Family: Apterygidae
Genus: Apteryx
Species:
A. rowi
Binomial name
Apteryx rowi
Tennyson et al. 2003 [2]
Apteryx rowi distribution.png
Synonyms
  • Apteryx rowiBurbidge et al. 2003 nomen nudum
  • Apteryx rowiMarsh 2003 nomen nudum

The Okarito kiwi (Apteryx rowi), also known as the rowi or Okarito brown kiwi, is a member of the kiwi family Apterygidae, described as new to science in 2003. [3] The species is part of the brown kiwi complex, and is morphologically very similar to other members of that complex. It is found in a restricted area of the Ōkārito forest on the West Coast of New Zealand's South Island, [4] and has a population of only about 600 birds. [5]

Contents

Taxonomy

The Okarito kiwi is a monotypic species, i.e. there are no recognised subspecies. [4] The genus name Apteryx stems from the Greek "without wings". [6] Originally assumed to be the same species as the Southern brown kiwi A. australis, DNA testing shows that the possible split off from this species was 8.2 million years ago, and the split from their closest relatives, the Northern Island brown kiwi A. mantelli was around 6.2 million years ago. [7] This bird is a ratite and has similarities to the others (emu, ostrich, rhea, cassowary). Its sternum has no keel, its wings are minimal, and it has no preen gland. Its palate is also distinctive, and its feathers have no barbules or aftershaft. Other features that are similar to only the other kiwi is a weak gizzard and no tail, only a pygostyle. [8]

Range and habitat

The Okarito brown kiwi lives in the Okarito forest on the West Coast of New Zealand's South Island. [4] [9] On 29 June 2010, three breeding pairs were released onto Blumine Island as part of a breeding programme. [10] A new population was established in the Omoeroa Ranges near Fox Glacier in late 2018. [11] In 2021 signs of Rowi were detected in Ballyhooly Bush, remnant mataī forest on the Lower Whataroa River flats, 24 km from Ōkārito forest. [12]

Reproduction

The female can lay up to three eggs, each in a different nest. Both the male and the female incubate the eggs. The egg is very large, as it weighs 20% of the female's weight (as in all kiwi). Most pairs are monogamous throughout their lives. [9]

The West Coast Wildlife Centre, at Franz Josef, is part of Project Nest Egg, breeding rowi. TWC Wildlife Centre* Stewart Nimmo * MRD 8502.jpg
The West Coast Wildlife Centre, at Franz Josef, is part of Project Nest Egg, breeding rowi.

Status and conservation

The Okarito kiwi is currently classified as Vulnerable by the IUCN due to habitat loss and predation by introduced stoats. [1] Conservation efforts such as Operation Nest Egg and the stoat control regime have been partially successful in restoring the rowi population. However, the rowi is still in a fragile stage of existence. Predation, mainly from imported animals such as stoats, is still the biggest threat to the rowi. The South Okarito Forest was designated a kiwi sanctuary in 2000. [9]

The West Coast Wildlife Centre in Franz Josef village operates a conservation programme as part of Operation Nest Egg. Eggs at risk of predation are removed, the chicks hatched in captivity, raised in a natural predator-free environment until old enough to fend for themselves, and then returned to the wild. The operation opened in 2010 and has been responsible for raising the wild population of rowi from just 165 ageing adults in the 1990s to 600 as of 2019. [13] Surveys have ensured that there is no noticeable difference in behaviour between such birds and rowi growing up fully in the wild. The Wildlife Centre is the only place in New Zealand where one can see rowi in a nocturnal walkthrough area. [14]

Related Research Articles

<span class="mw-page-title-main">Kiwi (bird)</span> Order of birds

Kiwi are flightless birds endemic to New Zealand of the order Apterygiformes. The five extant species fall into the family Apterygidae and genus Apteryx. Approximately the size of a domestic chicken, kiwi are the smallest ratites.

<span class="mw-page-title-main">Ōkārito Lagoon</span> Lagoon in New Zealand

Ōkārito Lagoon is a coastal lagoon on the West Coast of New Zealand's South Island. It is located 130 kilometres (81 mi) south of Hokitika, and covers an area of about 3,240 hectares (12.5 sq mi), making it the largest unmodified coastal wetland in New Zealand. It preserves a sequence of vegetation types from mature rimu forest through mānuka scrub to brackish water that has been lost in much of the rest of the West Coast. The settlement of Ōkārito is at the southern end of the lagoon.

<i>Cyanoramphus malherbi</i> Species of New Zealand bird

Cyanoramphus malherbi is a small parrot endemic to New Zealand, where it is known as the orange-fronted parakeet or orange-fronted kākāriki. In the rest of the world it is called Malherbe's parakeet, as when it was recognised as a species, the name "orange-fronted parakeet" was already used for Eupsittula canicularis, a Central American species. Restricted to a few valleys in the South Island and four offshore islands, its population declined to around 200 in the 1990s, and it is considered critically endangered by the IUCN.

<span class="mw-page-title-main">Southern brown kiwi</span> Species of bird

The southern brown kiwi, tokoeka, or common kiwi is a species of kiwi from South Island, New Zealand. Until 2000 it was considered conspecific with the North Island brown kiwi, and still is by some authorities.

<span class="mw-page-title-main">Great spotted kiwi</span> Species of flightless bird in New Zealand

The great spotted kiwi, great grey kiwi or roroa is a species of kiwi endemic to the South Island of New Zealand. The great spotted kiwi, as a member of the ratites, is flightless. It is the largest of the kiwi. The rugged topography and harsh climate of the high altitude alpine part of its habitat render it inhospitable to a number of introduced mammalian predators, which include dogs, ferrets, cats, and stoats. Because of this, populations of this species have been less seriously affected by the predations of these invasive species compared to other kiwi. Nonetheless, there has been a 43% decline in population in the past 45 years, due to these predators and habitat destruction. This has led it to be classified as vulnerable. There are less than 16,000 great spotted kiwis in total, almost all in the more mountainous parts of northwest Nelson, the northwest coast, and the Southern Alps. A minority live on island reserves.

<span class="mw-page-title-main">Little spotted kiwi</span> Species of bird

The little spotted kiwi or little grey kiwi is a small flightless bird in the kiwi family, Apterygidae. It is the smallest of the five kiwi species, at about 0.9 to 1.9 kg, about the size of a bantam. It is endemic to New Zealand, and in pre-European times occurred in both main islands, but is now restricted to a number of small offshore islands, and mainland reserves protected by pest-exclusion fences. Little spotted kiwi was on the brink of extinction when a conservation effort took place 100 years ago. Five individuals were translocated from the South Island of New Zealand to Kapiti Island. Today, the Kapiti Island population has grown, with around 1200 birds.

<span class="mw-page-title-main">North Island brown kiwi</span> Species of bird

The North Island brown kiwi is a species of kiwi that is widespread in the northern two-thirds of the North Island of New Zealand and, with about 35,000 remaining, it is the most common kiwi. It holds the world record for laying the largest eggs relative to its body size.

<span class="mw-page-title-main">Mauritius fody</span> Species of bird

The Mauritius fody is a rare species of bird in the weaver family. It is endemic to the island of Mauritius. It is classified by BirdLife International as being endangered. It is also on the United States' Endangered Species List with an endangered status.

<span class="mw-page-title-main">Red-crowned parakeet</span> Species of bird

The red-crowned parakeet, also known as red-fronted parakeet and by its Māori name of kākāriki, is a small parrot from New Zealand. It is characterised by its bright green plumage and the red pattern on its head. This versatile bird can feed on a variety food items and can be found in many habitat types. It used to be classified as near threatened as invasive predators had pushed it out of its historical range but it is now at least concern. This species used to occupy the entire island, but is now confined to only a few areas on the mainland and some offshore islands.

<span class="mw-page-title-main">Rotoroa Island</span> Island in New Zealand

Rotoroa Island is an island to the east of Waiheke Island in the Hauraki Gulf of New Zealand. It covers 82 hectares. The Salvation Army purchased it for £400 in 1908 from the Ruthe family to expand their alcohol and drug rehabilitation facility at nearby Pakatoa Island. Men were treated at Home Bay at Rotoroa, while women were treated at Pakatoa. This treatment facility was closed in 2005.

<span class="mw-page-title-main">Victoria Forest Park</span> Conservation park in New Zealand

Victoria Forest Park, is situated on the West Coast of the South Island of New Zealand. At 2,069 square kilometres (799 sq mi) it is New Zealand's largest forest park. The park is administered by the Department of Conservation (DOC).

<span class="mw-page-title-main">Haast tokoeka</span> Species of kiwi

The Haast tokoeka or Haast kiwi is a putative subspecies of the southern brown kiwi. It is one of the rarest kiwi in New Zealand. Like other kiwi, this bird is flightless.

<span class="mw-page-title-main">Ōkārito</span> Place in West Coast, New Zealand

Ōkārito is a small coastal settlement on the West Coast of New Zealand's South Island, 127 kilometres (79 mi) southwest of Hokitika, and 10 kilometres (6.2 mi) from State Highway 6. It is built at the southern end of the Ōkārito Lagoon at the mouth of the Ōkārito River. The settlement of The Forks is located just inland, on the banks of the river.

<span class="mw-page-title-main">Introduction of species to Mana Island</span> New Zealand ecological restoration programme

The New Zealand Department of Conservation has introduced a number of animal and plant species to Mana Island, near Porirua, New Zealand, as part of an ecological restoration programme since taking over conservation management of the island in 1987. Some were reintroductions of species wiped out during years of agricultural use or the subsequent explosion in the number of house mice on the island. A pest control programme eliminated the mice by 1990 and many species have been introduced since. Notable successes include the spotted skink, Duvaucel's gecko and the flax weevil, which are now regarded as well established, and the yellow-crowned parakeet, which has been described as abundant and widespread. Attempts have been made to introduce several seabird species in what the Department of Conservation describes as "the world's most complex seabird translocation project"; results have been mixed.

<span class="mw-page-title-main">West Coast Wildlife Centre</span> Zoo in Franz Josef / Waiau

The West Coast Wildlife Centre is a kiwi-rearing facility in Franz Josef, New Zealand. A public-private partnership with the Department of Conservation and Te Rūnunga o Makaawhio of Ngāi Tahu, it hatches eggs of the kiwi species rowi and Haast tokoeka retrieved from the wild. It rears the chicks until they are large enough for transfer to outdoor enclosures as part of Operation Nest Egg. More than 50 per cent of all living rowi were hatched at the Wildlife Centre. It is also a tourist attraction with several captive tuatara, museum displays, and tours of the rearing facility.

<span class="mw-page-title-main">Lake Gault</span>

Lake Gault is a small glacial lake in South Westland, New Zealand, near the township of Fox Glacier. A walking track from Lake Matheson leads to the lake, which is surrounded by mature native forest. A small hydro-electric power plant was constructed piping water from the lake to power a gold mining dredge at Gillespies Beach. Endangered Ōkārito kiwi (rowi) have been released into the wild around Lake Gault.

The Fiordland tokoeka or Fiordland kiwi is a subspecies of southern brown kiwi. It is endemic to New Zealand. Like other ratites, it is flightless.

<span class="mw-page-title-main">Stewart Island kiwi</span>

The Stewart Island tokoeka, Stewart Island kiwi, Rakiura tokoeka or Rakiura kiwi is a subspecies of southern brown kiwi endemic to New Zealand. Like other ratites, it is a flightless bird.

<span class="mw-page-title-main">Waitangiroto Nature Reserve</span> Nature reserve in New Zealand

The Waitangiroto Nature Reserve is a protected area of 1,534 ha near Whataroa, in the West Coast of New Zealand. The reserve consists of lowland kahikatea swamp forest either side of the Waitangiroto River. It is notable as the site of the only breeding colony of kōtuku or white heron in New Zealand, comprising 100–120 birds. Royal spoonbills and little shags also breed alongside the kōtuku. The breeding colony is a visitor attraction during the breeding season, but access to the entire nature reserve is by permit only. Visitors can view the birds from a hide across the Waitangiroto River. Tours of the reserve operate from a base in Whataroa.

References

  1. 1 2 BirdLife International (2017). "Apteryx rowi". IUCN Red List of Threatened Species . 2017: e.T22732871A119169794. doi: 10.2305/IUCN.UK.2017-3.RLTS.T22732871A119169794.en . Retrieved 18 November 2021.
  2. Gill; et al. (2010). "Checklist of the birds of New Zealand, Norfolk and Macquarie Islands, and the Ross Dependency, Antarctica" (PDF) (4th ed.). Te Papa Press. Retrieved 22 May 2016.
  3. Tennyson, A.J.D.; Palma, R.L.; Robertson, H.A.; Worthy, T.H.; Gill, B.J. (2003). "A new species of kiwi (Aves, Apterygiformes) from Okarito, New Zealand". Records of the Auckland Museum . 40: 55–64.
  4. 1 2 3 Clements, James (2007). The Clements Checklist of the Birds of the World (6th ed.). Ithaca, NY: Cornell University Press. ISBN   978-0-8014-4501-9.
  5. Mills, Laura (13 December 2018). "Rare rowi kiwi to be released in Westland". Otago Daily Times Online News. Retrieved 26 October 2019.
  6. Gotch, A.F. (1995) [1979]. "Kiwis". Latin Names Explained. A Guide to the Scientific Classifications of Reptiles, Birds & Mammals. London: Facts on File. p. 180. ISBN   978-0-8160-3377-5.
  7. Brewer, David (2018). Birds New to Science: Fifty Years of Avian Discovery. London: Christopher Helm. p. 22. ISBN   978-1-4729-0628-1.
  8. Davies, S.J.J.F. (2003). "Kiwis". In Hutchins, Michael (ed.). Grzimek's Animal Life Encyclopedia. 8. Vol. Birds I Tinamous and Ratites to Hoatzins (2nd ed.). Farmington Hills, MI: Gale Group. pp. 89–90. ISBN   978-0-7876-5784-0.
  9. 1 2 3 New Zealand Department of Conservation (DOC) (2013). "Rowi: New Zealand native land birds". New Zealand Department of Conservation (DOC). Retrieved 28 November 2013.
  10. "Kiwi released on Blumine Island". The Marlborough Express . 30 June 2010. Retrieved 1 November 2011.
  11. Naish, Joanne (2 September 2021). "New chick a sign of hope for rarest kiwi". The Press . p. 9.
  12. "Rare kiwi found at Whataroa". Greymouth Star. 25 August 2021. p. 1.
  13. Waterworth, Kerrie (9 February 2018). "Rescuing rowi". Greymouth Star . p. 8.
  14. Anna Turner (20 July 2012). "Influx of kiwi eggs forces centre expansion". The Press . Retrieved 19 March 2015.