This article is about the New Zealand bird. For the North American bird, see rock wren.
The New Zealand rock wren (Xenicus gilviventris) is a small New Zealand wren (family Acanthisittidae) endemic to the South Island of New Zealand. Its Māori names include pīwauwau ("little complaining bird"), mātuitui, and tuke ("twitch", after its bobbing motion).[2] Outside New Zealand it is sometimes known as the rockwren to distinguish it from the unrelated rock wren of North America.
The rock wren is currently restricted to alpine and subalpine areas of the South Island. It is a poor flier and highly terrestrial, feeding in low scrub, open scree, and rockfalls. The rock wren and rifleman are the only two surviving New Zealand wrens; the rock wren's closest relatives were the extinct stout-legged wrens, followed by the extinct bushwren.[3] Its numbers are declining due to predation by introduced mammals.
Xenicus gilviventris, showing distinctive green, yellow, and grey colouring.
The rock wren is a very small, almost tailless bird that prefers to hop and run on its long legs, and uses its rounded wings to fly only short distances. Males are 16 g, females 20 g. Males are greenish with yellow flanks and a pale underside, females tend to be browner, although the degree of difference between the sexes varies geographically.[4]
Distribution and habitatEdit
This species is currently confined to alpine and subalpine zones (900–2500 m altitude)[5] of the Southern Alps, the Tasman Mountains of Northwest Nelson, and the Victoria Range of Westland, all in the South Island;[4] it is New Zealand's only truly alpine bird.[6] Subfossil remains suggest before Polynesian settlement it was also found in lowland forest. DNA from remains previously thought to be of North Island origin were compared with South Island wrens and found to be more closely related to the southern South Island clade. The misidentified North Island specimen is attributed to a mislabeling by the original collector.[7] Its current alpine distribution is a habitat where few rodents can survive, full of sheltering rocks and dense vegetation.[8]
Their preferred habitat is close to the treeline, amongst rockfalls, scree, fellfield, and low scrub. Rock wrens, unlike many alpine birds, do not migrate to lower elevations in winter;[4] instead, they seem to shelter and forage in rockfalls beneath the snow layer.[2]
BehaviourEdit
Rock wren nest
The rock wren is a poor flier, rarely flying more than 2 m off the ground or for distances of more than 30 m. It prefers to hop and run with distinctive bobbing and wing flicks.[9] Its call is three high-pitched notes, and pairs sometimes duet.[4]
Pairs maintain a year-round territory, and work together to build a large enclosed nest with an entrance tunnel. The nest is lined with feathers, often from other species of birds. Guthrie-Smith recovered 791 feathers from one nest in the 1930s, most from weka, but including some kiwi, kākāpō, kea, and kererū.[10] (Rock wrens are such assiduous collectors of feathers that their nests have been checked for kākāpō feathers, to determine if those endangered parrots are in the area.)[2] Around three eggs are laid in late spring and incubated for three weeks. Chicks take about 24 days to fledge and are fed for at least 4 weeks.[2][4]
Rock wrens mostly eat invertebrates on the ground, but will sometimes take berries and seeds, and even nectar from flax flowers.[4]
ConservationEdit
Rock wren in its preferred habitat
Writing in the 1930s,[10] Herbert Guthrie-Smith declared,
Xenicus gilviventris, I am glad to think, is one of the species likely to survive changes that from the forester’s and field naturalist’s point of view have desolated New Zealand. The ravages wrought elsewhere by deer, rabbits, opossums, birds, and other imported vermin are unlikely to affect the welfare of the rock wren. Even weasels and rats — and I know they ascend to great heights — are hardly likely to draw sufficient recompense in prey from such unpeopled solitudes.… With cover and food supplies unmodified, the rock wren may be considered relatively safe.
This was not to be. Since European settlement, rock wrens have become more patchy in their distribution; a study of over 2,100 sightings between 1912 and 2005 showed the area they inhabit had declined significantly since the 1980s.[6][11] In the Murchison Mountains, rock wren showed a 44% decline in abundance over 20 years.[6] The main threats to rock wrens are stoats and mice, which eat their eggs and young: A 2012–13 study in the upper Hollyford showed that most rock wren nests were being preyed upon by stoats.[9] Predator trapping improved daily survival rates, egg hatching and fledgling rates of rock wrens.[12] The long-term effect of climate change on their alpine habitat is also a threat, as warmer temperatures will allow rats to move higher into the mountains.[2]
In 2008–2010, a total of 40 rock wrens were translocated to Secretary Island, an 8140 ha rodent-free island in Fiordland, the third-tallest island in New Zealand.[2] In 2010 a survey located 12 unbanded rock wrens, indicating they were successfully breeding.[13]
^BirdLife International (2017). "Xenicus gilviventris". IUCN Red List of Threatened Species. 2017: e.T22698585A111474204. doi:10.2305/IUCN.UK.2017-1.RLTS.T22698585A111474204.en. Retrieved 12 November 2021.
^ abcdefWarne, Kennedy (June 2009). "The Also Wren". New Zealand Geographic (97): 80–91.
^Mitchell, Kieren J.; Wood, Jamie R.; Llamas, Bastien; McLenachan, Patricia A.; Kardailsky, Olga; Scofield, R. Paul; Worthy, Trevor H.; Cooper, Alan (September 2016). "Ancient mitochondrial genomes clarify the evolutionary history of New Zealand's enigmatic acanthisittid wrens". Molecular Phylogenetics and Evolution. 102: 295–304. doi:10.1016/j.ympev.2016.05.038. PMID 27261250.
^ abcdefHeather, Barrie D.; Robertson, Hugh A. (2005). The Field Guide to the Birds of New Zealand. Auckland: Penguin. p. 374. ISBN978-0-14-302040-0.
^Gaze, Peter (2013). Miskelly, Colin M. (ed.). "Rock wren | Pīwauwau". New Zealand Birds Online.
^ abcMichelsen-Heath, Sue; Gaze, Peter (2007). "Changes in abundance and distribution of rock wren (Xenicus gilviventris) in the South Island, New Zealand". Notornis. 54 (2): 71–78.
^Verry, Alexander J. F.; Scarsbrook, Lachie; Schofield, R. Paul; Tennyson, Alan J. D.; Weston, Kerry A.; Robertson, Bruce C.; Rawlence, Nicolas J. (2019). "Who, Where, What, Wren? Using Ancient DNA to Examine the Veracity of Museum Specimen Data: A Case Study of the New Zealand Rock Wren (Xenicus gilviventris)". Frontiers in Ecology and Evolution. 7. doi:10.3389/fevo.2019.00496.
^Worthy, Trevor N.; Holdaway, Richard N. (2002). The Lost World of the Moa. Bloomington, IN: Indiana University Press. p. 425. ISBN0-253-34034-9.
^ abGaze, Peter D. (2013). Miskelly, Colin M. (ed.). "Rock Wren". New Zealand Birds Online. Retrieved 6 April 2016.
^ abGuthrie-Smith, Herbert (1936). Sorrows and Joys of a New Zealand Naturalist. Dunedin: A. H. & A. W. Reed.
^"Rock wren sightings sought as figures fall". Otago Daily Times. 30 December 2008. Retrieved 30 December 2008.
^Weston, K.A.; O’Donnell, C.F.J.; van dam-Bates, P.; Monks, J.M. (2018). "Control of invasive predators improves breeding success of an endangered alpine passerine". Ibis. 160 (4): 892–899. doi:10.1111/ibi.12617. S2CID 91028336.
^. Wildlife Extra. Archived from the original on 28 March 2016. Retrieved 6 April 2016.
^"Bird of the Year: Pīwauwau/ rock wren crowned as 2022 winner". RNZ. 31 October 2022.
^ McClure, Tess (30 October 2022). "Little-known pīwauwau rock wren named as New Zealand's 2022 bird of the year". The Guardian. London, United Kingdom. ISSN 0261-3077. Retrieved 2022-10-31.
Further readingEdit
Higgins, P.J.; Peter, J.M.; Steele, W.K., eds. (2001). "Xenicus gilviventris Rock Wren" (PDF). Handbook of Australian, New Zealand & Antarctic Birds: Volume 5, Tyrant-flycatchers to Chats. Melbourne, Victoria: Oxford University Press. pp. 81–90. ISBN978-0-19-553258-6.
zealand, rock, wren, this, article, about, zealand, bird, north, american, bird, rock, wren, xenicus, gilviventris, small, zealand, wren, family, acanthisittidae, endemic, south, island, zealand, māori, names, include, pīwauwau, little, complaining, bird, mātu. This article is about the New Zealand bird For the North American bird see rock wren The New Zealand rock wren Xenicus gilviventris is a small New Zealand wren family Acanthisittidae endemic to the South Island of New Zealand Its Maori names include piwauwau little complaining bird matuitui and tuke twitch after its bobbing motion 2 Outside New Zealand it is sometimes known as the rockwren to distinguish it from the unrelated rock wren of North America New Zealand rock wrenConservation statusEndangered IUCN 3 1 1 Scientific classificationDomain EukaryotaKingdom AnimaliaPhylum ChordataClade DinosauriaClass AvesOrder PasseriformesFamily AcanthisittidaeGenus XenicusSpecies X gilviventrisBinomial nameXenicus gilviventrisPelzeln 1867The rock wren is currently restricted to alpine and subalpine areas of the South Island It is a poor flier and highly terrestrial feeding in low scrub open scree and rockfalls The rock wren and rifleman are the only two surviving New Zealand wrens the rock wren s closest relatives were the extinct stout legged wrens followed by the extinct bushwren 3 Its numbers are declining due to predation by introduced mammals Contents 1 Description 2 Distribution and habitat 3 Behaviour 4 Conservation 5 References 6 Further reading 7 External linksDescription Edit nbsp Xenicus gilviventris showing distinctive green yellow and grey colouring The rock wren is a very small almost tailless bird that prefers to hop and run on its long legs and uses its rounded wings to fly only short distances Males are 16 g females 20 g Males are greenish with yellow flanks and a pale underside females tend to be browner although the degree of difference between the sexes varies geographically 4 Distribution and habitat EditThis species is currently confined to alpine and subalpine zones 900 2500 m altitude 5 of the Southern Alps the Tasman Mountains of Northwest Nelson and the Victoria Range of Westland all in the South Island 4 it is New Zealand s only truly alpine bird 6 Subfossil remains suggest before Polynesian settlement it was also found in lowland forest DNA from remains previously thought to be of North Island origin were compared with South Island wrens and found to be more closely related to the southern South Island clade The misidentified North Island specimen is attributed to a mislabeling by the original collector 7 Its current alpine distribution is a habitat where few rodents can survive full of sheltering rocks and dense vegetation 8 Their preferred habitat is close to the treeline amongst rockfalls scree fellfield and low scrub Rock wrens unlike many alpine birds do not migrate to lower elevations in winter 4 instead they seem to shelter and forage in rockfalls beneath the snow layer 2 Behaviour Edit nbsp Rock wren nestThe rock wren is a poor flier rarely flying more than 2 m off the ground or for distances of more than 30 m It prefers to hop and run with distinctive bobbing and wing flicks 9 Its call is three high pitched notes and pairs sometimes duet 4 Pairs maintain a year round territory and work together to build a large enclosed nest with an entrance tunnel The nest is lined with feathers often from other species of birds Guthrie Smith recovered 791 feathers from one nest in the 1930s most from weka but including some kiwi kakapō kea and kereru 10 Rock wrens are such assiduous collectors of feathers that their nests have been checked for kakapō feathers to determine if those endangered parrots are in the area 2 Around three eggs are laid in late spring and incubated for three weeks Chicks take about 24 days to fledge and are fed for at least 4 weeks 2 4 Rock wrens mostly eat invertebrates on the ground but will sometimes take berries and seeds and even nectar from flax flowers 4 Conservation Edit nbsp Rock wren in its preferred habitatWriting in the 1930s 10 Herbert Guthrie Smith declared Xenicus gilviventris I am glad to think is one of the species likely to survive changes that from the forester s and field naturalist s point of view have desolated New Zealand The ravages wrought elsewhere by deer rabbits opossums birds and other imported vermin are unlikely to affect the welfare of the rock wren Even weasels and rats and I know they ascend to great heights are hardly likely to draw sufficient recompense in prey from such unpeopled solitudes With cover and food supplies unmodified the rock wren may be considered relatively safe This was not to be Since European settlement rock wrens have become more patchy in their distribution a study of over 2 100 sightings between 1912 and 2005 showed the area they inhabit had declined significantly since the 1980s 6 11 In the Murchison Mountains rock wren showed a 44 decline in abundance over 20 years 6 The main threats to rock wrens are stoats and mice which eat their eggs and young A 2012 13 study in the upper Hollyford showed that most rock wren nests were being preyed upon by stoats 9 Predator trapping improved daily survival rates egg hatching and fledgling rates of rock wrens 12 The long term effect of climate change on their alpine habitat is also a threat as warmer temperatures will allow rats to move higher into the mountains 2 In 2008 2010 a total of 40 rock wrens were translocated to Secretary Island an 8140 ha rodent free island in Fiordland the third tallest island in New Zealand 2 In 2010 a survey located 12 unbanded rock wrens indicating they were successfully breeding 13 The rock wren was voted New Zealand Bird of the Year for 2022 14 15 References Edit BirdLife International 2017 Xenicus gilviventris IUCN Red List of Threatened Species 2017 e T22698585A111474204 doi 10 2305 IUCN UK 2017 1 RLTS T22698585A111474204 en Retrieved 12 November 2021 a b c d e f Warne Kennedy June 2009 The Also Wren New Zealand Geographic 97 80 91 Mitchell Kieren J Wood Jamie R Llamas Bastien McLenachan Patricia A Kardailsky Olga Scofield R Paul Worthy Trevor H Cooper Alan September 2016 Ancient mitochondrial genomes clarify the evolutionary history of New Zealand s enigmatic acanthisittid wrens Molecular Phylogenetics and Evolution 102 295 304 doi 10 1016 j ympev 2016 05 038 PMID 27261250 a b c d e f Heather Barrie D Robertson Hugh A 2005 The Field Guide to the Birds of New Zealand Auckland Penguin p 374 ISBN 978 0 14 302040 0 Gaze Peter 2013 Miskelly Colin M ed Rock wren Piwauwau New Zealand Birds Online a b c Michelsen Heath Sue Gaze Peter 2007 Changes in abundance and distribution of rock wren Xenicus gilviventris in the South Island New Zealand Notornis 54 2 71 78 Verry Alexander J F Scarsbrook Lachie Schofield R Paul Tennyson Alan J D Weston Kerry A Robertson Bruce C Rawlence Nicolas J 2019 Who Where What Wren Using Ancient DNA to Examine the Veracity of Museum Specimen Data A Case Study of the New Zealand Rock Wren Xenicus gilviventris Frontiers in Ecology and Evolution 7 doi 10 3389 fevo 2019 00496 Worthy Trevor N Holdaway Richard N 2002 The Lost World of the Moa Bloomington IN Indiana University Press p 425 ISBN 0 253 34034 9 a b Gaze Peter D 2013 Miskelly Colin M ed Rock Wren New Zealand Birds Online Retrieved 6 April 2016 a b Guthrie Smith Herbert 1936 Sorrows and Joys of a New Zealand Naturalist Dunedin A H amp A W Reed Rock wren sightings sought as figures fall Otago Daily Times 30 December 2008 Retrieved 30 December 2008 Weston K A O Donnell C F J van dam Bates P Monks J M 2018 Control of invasive predators improves breeding success of an endangered alpine passerine Ibis 160 4 892 899 doi 10 1111 ibi 12617 S2CID 91028336 New Zealand Rock wren thriving on new sanctuary Wildlife Extra Archived from the original on 28 March 2016 Retrieved 6 April 2016 Bird of the Year Piwauwau rock wren crowned as 2022 winner RNZ 31 October 2022 McClure Tess 30 October 2022 Little known piwauwau rock wren named as New Zealand s 2022 bird of the year The Guardian London United Kingdom ISSN 0261 3077 Retrieved 2022 10 31 Further reading EditHiggins P J Peter J M Steele W K eds 2001 Xenicus gilviventris Rock Wren PDF Handbook of Australian New Zealand amp Antarctic Birds Volume 5 Tyrant flycatchers to Chats Melbourne Victoria Oxford University Press pp 81 90 ISBN 978 0 19 553258 6 BirdLife International 2006 Species factsheet Xenicus gilviventris Downloaded from http www birdlife org on 12 2 2007External links Edit nbsp Wikispecies has information related to Xenicus gilviventris nbsp Wikimedia Commons has media related to Xenicus gilviventris New Zealand rock wren discussed on RNZ Critter of the Week 22 Jan 2016 Specimens in the collection of the Museum of New Zealand Te Papa Tongarewa including holotype and syntypes Portals nbsp Birds nbsp New Zealand Retrieved from https en wikipedia org w index php title New Zealand rock wren amp oldid 1162634369, wikipedia, wiki, book, books, library,
