New Zealand fairy tern | |
---|---|
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Aves |
Order: | Charadriiformes |
Family: | Laridae |
Genus: | Sternula |
Species: | |
Subspecies: | S. n. davisae |
Trinomial name | |
Sternula nereis davisae |
The New Zealand fairy tern or tara-iti (Sternula nereis davisae) is a subspecies of the fairy tern endemic to New Zealand. It is New Zealand's rarest native breeding bird, with about 40 individuals left in the wild. [1] It nests at four coastal locations between Whangārei and Auckland in the North Island. [2] [3] It is threatened by introduced predators, extreme storms and tides, beach activity, and waterfront development. [1]
The New Zealand fairy tern is currently considered a subspecies of the fairy tern (Sternula nereis). Two other subspecies exist: Sternula nereis nereis, which breeds in western and southern Australia, and S. n. exsul, which breeds in New Caledonia. Fairy terns were first described from the Bass Strait in Australia in 1843. The New Zealand species was first identified by Dunedin naturalist Thomas Potts in the Rakaia riverbed in Canterbury; it was breeding in the Rakaia Gorge. He noted there were already two specimens in the collections of Canterbury Museum. [4]
The New Zealand fairy tern is distinguishable from the other two subspecies on the basis of its morphology and behaviour, and has a distinct genetic haplotype. Genetic studies found there was almost no gene flow or migration between the New Zealand and Australian populations.
The New Zealand fairy tern was noted as being common in the late 19th century. [5] However, these records have been suggested as inaccurate as the birds can be difficult to distinguish from little terns. [6] [7] From 1940 to 1983, the New Zealand fairy tern was known to have bred at several sites along the northern coastline of the North Island. [8] Their breeding range extended from Ruakākā, in Northland, to Tauranga in the Bay of Plenty. [8] New Zealand fairy terns were also reportedly found in Canterbury, in the South Island. [9] However, from the mid-1970s, the population declined rapidly. [6] By 1984, New Zealand fairy tern breeding was restricted to three sites in Northland: the Papakanui sandspit in Kaipara Harbour, the Waipu sandspit, and the Mangawhai sandspit. [8]
Currently, New Zealand fairy terns still occupy these breeding sites, with the addition of a new breeding site in 2012 at the Te Arai Stream mouth, south of Mangawhai. [10] [11] Forest & Bird is working to establish an alternative breeding site on the Kaipara harbour. [12] In August 2018, the Department of Conservation and the New Zealand Defence Force worked to build a nest site ahead of the breeding season at Papakanui. [13]
Unlike other species of terns which forage in the open ocean, the New Zealand fairy tern is not a plunge diver, but instead feeds in the top 5–8 cm of the water; it can capture prey in extremely shallow water such as estuaries and tidal pools. Adult birds have been observed feeding gobies (Favonigobius lentiginosus and F. exquisitus) and flounders (Rhombosolea sp.) to their chicks, and adult diet may include a substantial number of shrimps. [14] Birds were observed foraging in Te Arai Stream, the mouth of which is a popular flocking for post-breeding fairy terns, but appeared to be getting most of their food from elsewhere. [3]
Courtship begins in September, with egg laying occurring between late October and early January. Birds typically lay 1-2 eggs per nest. [11]
Nests are small unlined scrapes in the sand and are roped off and monitored by The Department of Conservation. [10] The nests are constructed near white, grey and orange shell debris to help disguise the eggs and chicks, and are found at least 1 km apart from each other. [11] Guthrie-Smith describes a nest as follows:
"On such a strip, sparsely sprinkled with little heaps of pebbles and surface shells in two and threes, lay the couple of eggs. These surface sea shells had been allowed to remain, as camouflage, untampered with, but from elsewhere had been also collected twenty or thirty other halves and wholes, showing deep lateral widths of purple and pink. Not a brilliantly tinted shell had been missed over the couple of acres I searched. The hen tern had then laid eggs to match the bivalves, the shells bright pink." [15]
Females spend more time incubating eggs than males, while males provide the majority of food to the chicks. The chicks are mobile from hatching, and ready to fully fledge from 30 days old. [11]
They are vulnerable to environmental events, such as storms and high tides, and predation. [10] The encroachment of human activity on their nesting grounds (often, popular beaches) is a major threat to these birds. Beach narrowing, mainly due to housing developments and weed invasion, forces the terns to nest closer to the sea, putting their eggs at risk during storms. Introduced predators and human disturbance also threaten nesting sites.
The wintering range of the birds extends over the Kaipara Harbour. Outside of the breeding season fairy terns form flocks on the harbour, often around Tapora.
The number of birds had plummeted to three breeding pairs and eleven individuals by 1983, but intensive conservation efforts were put in place by the New Zealand Wildlife Service. [16] Mangawhai and Papakanui Spit nest sites became protected in 1983, and a site at Waipu in 1994. [16] Numbers increased so that in 1998 the population totalled some 25 to 30 birds with 8 to 10 breeding pairs spread over three breeding sites. Numbers continued to increase due to the Department of Conservation's Recovery Plan, [10] and by 2006 had reached 30 to 40 individuals including 12 breeding pairs. Five years later, numbers were stabilised at 40 to 45 individuals and around 10 breeding pairs. [17] In 2019, there are 45 individuals and approximately 12 breeding pairs.
A fairy tern recovery plan was created in 2005, and aimed to cover strategy over 10 years, but the recovery group was dissolved before the end of that term. [16] During the 2008 breeding season, at least 11 chicks were fledged, although no more than 6 chicks were fledged per season in the decade following. [16] During the 2018/19 breeding season, it was estimated that numbers had dropped to only five breeding pairs, and only 3 chicks hatched, making it "the worst breeding season for 27 years". [16] The Department of Conservation suspected this worsening was partially due to high winds, as well as the appearance of a "mysterious blue substance" on the beach at Waipu. [16] A 2017 review recommended the establishment of a fairy tern recovery group to formulate a strategy for management of the species. [16] This group aims to be in force by March 2019, and research has begun to determine the reasons for the fairy tern's decline. [16]
In the 2006 Birthday Honours Gwenda Pulham was awarded a Queen's Service Medal for her work to protect fairy terns. [18] The New Zealand Fairy Tern Trust, established in 2008, contributes to the conservation effort by donating up to $40,000 annually for predator trapping. [16]
Year | Population estimate | Breeding pairs | Eggs | Fledged chicks |
---|---|---|---|---|
1983 | 11 | 3 | ||
1998 | 25-30 | 8-10 | ||
2006 | 30-40 | 12 | ||
2008 | 11 | |||
2011 | 40-45 | 10 | ||
2014 | Mangawhai sandspit - 18 | |||
2015 | Mangawhai sandspit - 5 | |||
2018/19 | 5 | 2 [19] |
With a total population at the time of fewer than fifty individuals including just ten breeding pairs, the IUCN rated this species as "Critically Endangered". [17] A New Zealand government source considers that this bird is "probably New Zealand's most endangered indigenous breeding bird." [10] It nests on sand and shell banks just above high tide mark and nesting is highly vulnerable to human development introduced predators, domestic animals, storms, very high tides and disturbance by humans on foot and in vehicles on the beach. [10] The New Zealand Fairy Tern's habitat is now limited to the lower Northland Peninsula. [10]
The Te Arai North Ltd owned Tara Iti Golf Club was built near the fairy terns' nesting area. [16] The bird is further threatened by a proposed residential subdivision at Te Arai, next to one of its prime breeding sites. [20] As part of its Treaty settlement, Te Uri o Hau purchased land in the Mangawhai Forest, and signed a co-governance agreement with developer Te Arai North. Two thousand homes were originally proposed for the development, however after opposition from The Te Arai Beach Preservation Society, Fairy Tern Charitable Trust, and others, this was scaled back to 46 homes and a 196-hectare public park. Disagreement stems from the damming of the Te Arai Stream, interfering with the life cycle of fish said to be key to the diet of fairy-terns. [21]
In 2019, scientists who have been studying fairy terns at Mangawhai on Northland's east coast now suspect the bird's decline may be linked to the removal of mangroves from the harbour. [19]
Terns are seabirds in the family Laridae, subfamily Sterninae, that have a worldwide distribution and are normally found near the sea, rivers, or wetlands. Terns are treated in eleven genera in a subgroup of the family Laridae, which also includes several genera of gulls and the skimmers (Rynchops). They are slender, lightly built birds with long, forked tails, narrow wings, long bills, and relatively short legs. Most species are pale grey above and white below with a contrasting black cap to the head, but the marsh terns, the black-bellied tern, the Inca tern, and some noddies have dark body plumage for at least part of the year. The sexes are identical in appearance, but young birds are readily distinguishable from adults. Terns have a non-breeding plumage, which usually involves a white forehead and much-reduced black cap.
The common tern is a seabird in the family Laridae. This bird has a circumpolar distribution, its four subspecies breeding in temperate and subarctic regions of Europe, Asia and North America. It is strongly migratory, wintering in coastal tropical and subtropical regions. Breeding adults have light grey upperparts, white to very light grey underparts, a black cap, orange-red legs, and a narrow pointed bill. Depending on the subspecies, the bill may be mostly red with a black tip or all black. There are several similar species, including the partly sympatric Arctic tern, which can be separated on plumage details, leg and bill colour, or vocalisations.
The piping plover is a small sand-colored, sparrow-sized shorebird that nests and feeds along coastal sand and gravel beaches in North America. The adult has yellow-orange-red legs, a black band across the forehead from eye to eye, and a black stripe running along the breast line. This chest band is usually thicker in males during the breeding season, and it is the only reliable way to tell the sexes apart. The bird is difficult to see when it is standing still, as it blends well with open, sandy beach habitats. It typically runs in short, quick spurts and then stops.
The little tern is a seabird of the family Laridae. It was first described by the German naturalist Peter Simon Pallas in 1764 and given the binomial name Sterna albifrons. It was moved to the genus Sternula when the genus Sterna was restricted to the larger typical terns. The genus name Sternula is a diminutive of Sterna, 'tern', while the specific name albifrons is from Latin albus, 'white', and frons, 'forehead'.
The roseate tern is a species of tern in the family Laridae. The genus name Sterna is derived from Old English "stearn", "tern", and the specific dougallii refers to Scottish physician and collector Dr Peter McDougall (1777–1814). "Roseate" refers to the bird's pink breast in breeding plumage.
The royal tern is a tern in the family Laridae. The species is endemic to the Americas, though vagrants have been identified in Europe.
The white tern or common white tern is a small seabird found across the tropical oceans of the world. It is sometimes known as the fairy tern, although this name is potentially confusing as it is also the common name of Sternula nereis. Other names for the species include angel tern and white noddy in English, and manu-o-Kū in Hawaiian. The little white tern, previously considered a subspecies of the white tern, is now recognised as a separate species.
The white-fronted tern, also known as tara, sea swallow, black-billed tern, kahawai bird, southern tern, or swallow tail, was first described by Johann Friedrich Gmelin in 1789. A medium-sized tern with an all-white body including underwing and forked tail, with grey hues on the over the upper side of the wing. In breeding adults a striking black cap covers the head from forehead to nape, leaving a small white strip above the black bill.
The double-banded plover, known as the banded dotterel or pohowera in New Zealand, is a species of bird in the plover family. Two subspecies are recognised: the nominate Charadrius bicinctus bicinctus, which breeds throughout New Zealand, including the Chatham Islands, and Charadrius bicinctus exilis, which breeds in New Zealand's subantarctic Auckland Islands.
The least tern is a species of tern that breeds in North America and locally in northern South America. It is closely related to, and was formerly often considered conspecific with, the little tern of the Old World. Other close relatives include the yellow-billed tern and Peruvian tern, both from South America.
The black-bellied tern is a tern found near large rivers in the Indian subcontinent, its range extending from Pakistan, Nepal and India to Myanmar. It has become very scarce in the eastern part of its range and the International Union for Conservation of Nature has assessed its conservation status as being endangered.
Te Ārai is a small community on the east coast of the North Island of New Zealand, near the northern end of the Auckland Region. Mangawhai lies to the north, and Tomarata to the south. The name of the suburb comes from Tāhuhunui-o-te-rangi, captain of the Moekākara waka, who landed here and set up a temporary shelter (arai). Tāhuhunui-o-te-rangi was later buried at Te Ārai.
The mottled petrel or kōrure is a species of seabird and a member of the gadfly petrels. It usually attains 33 to 35 cm (13–14 in) in length with a 74 to 82 cm (29–32 in) wingspan.
The Antarctic tern is a seabird in the family Laridae. It ranges throughout the southern oceans and is found on small islands around Antarctica as well as on the shores of the mainland. Its diet consists primarily of small fish and crustaceans. It is very similar in appearance to the closely related Arctic tern, but it is stockier, and it is in its breeding plumage in the southern summer, when the Arctic tern has shed old feathers to get its non-breeding plumage. The Antarctic tern does not migrate like the Arctic tern does, but it can still be found on a very large range. This tern species is actually more closely related to the South American tern.
The California least tern is a subspecies of least tern that breeds primarily in bays of the Pacific Ocean within a very limited range of Southern California, in San Francisco Bay and in northern regions of Mexico. This migratory bird is a U.S. federally listed endangered subspecies. The total population of the subspecies amounted to 582 breeding pairs in 1974, when census work on this bird began. While numbers have gradually increased with its protected status, the species is still vulnerable to population decline through natural disasters, predation, and human disturbance.
The fairy tern is a small tern which is native to the southwestern Pacific. It is listed as "Vulnerable" by the IUCN and the New Zealand subspecies is "Critically Endangered". Fairy terns live in colonies along the coastlines and estuaries of Australia, New Zealand, and New Caledonia, feeding largely on small, epipelagic schooling fishes, breeding in areas close to their feeding sites. They have a monogamous mating system, forming breeding pairs in which they mate, nest, and care for offspring.
The Peruvian tern is a species of tern in the family Laridae. Found in northern Chile, Ecuador, and Peru, its natural habitats are hot deserts, sandy shores, and coastal saline lagoons. It is threatened by habitat loss.
The yellow-billed tern is a small seabird found in South America. It is a species of tern in the family Laridae. It is found in Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Panama, Paraguay, Peru, Suriname, Trinidad and Tobago, Uruguay, and Venezuela. Its natural habitats are rivers, swamps, and freshwater lakes.
Hutton's shearwater is a medium-sized ocean-going seabird in the family Procellariidae. Its range is Australian and New Zealand waters, but it breeds only in mainland New Zealand. Its conservation status is Endangered, because there are just two remaining breeding colonies, located in the Seaward Kaikōura Range. Six other shearwater colonies have been wiped out by introduced pigs. Hutton's shearwater is the only seabird in the world that is known to breed in alpine areas. Conservation measures for the bird include community initiatives to rescue birds that crash-land at night on streets in Kaikōura, and the establishment of a protected area on the Kaikōura Peninsula including a predator-proof fence, man-made burrows, and translocating fledglings from the remaining colonies.
Tomarata Lake is a lake at Tomarata, Rodney in the northern Auckland Region of New Zealand.
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