Upland moa

From Wikipedia, the free encyclopedia
  (Redirected from Upland Moa)
Jump to: navigation, search
Upland Moa
Megalapteryx didinus skeleton 1897.jpg
Mounted skeleton
Conservation status

Extinct  (c.1500) (IUCN 3.1)
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Superorder: Paleognathae
Order: Dinornithiformes
Family: †Megalapterygidae
Genus: Megalapteryx
Haast[1]
Species: Megalapteryx didinus
Binomial name
Megalapteryx didinus
(Owen, 1883)[1]
Synonyms

The Upland Moa (Megalapteryx didinus) was a species of Moa bird endemic to New Zealand. It was a member of the ratite family, a type of flightless bird with no keel on the sternum. It was the last moa species to become extinct, vanishing around 1500 AD.

Taxonomy[edit]

In 2005, a genetic study suggested that M. benhami, which had previously been considered a junior synonym of M. didinus, may have been a valid species after all.[2]

The cladogram below follows a 2009 analysis by Bunce et al.:[3]


Dinornithidae

Dinornis robustus



Dinornis novaezealandiae



Megalapteryidae

Megalapteryx didinus




Emeidae
 
 
 

Pachyornis australis


 

Pachyornis elephantopus



Pachyornis geranoides






 
 

Anomalopteryx didiformis


 

Emeus crassus



Euryapteryx curtus






Description[edit]

Restoration from 1907

At less than 1 meter tall and about 17 to 34 kilograms, the upland moa was among the smallest of the moa species. Unlike other moas, it had feathers covering all of its body but the beak and the soles of its feet, an adaptation to its cold environment.[4] Scientists believed in the past that the upland moa held its neck and head upright; however, it actually carried itself in a stooped posture with its head level to its back.This would have helped it travel through the abundant vegetation in its habitat, whereas an extended neck would have been more suited to open spaces.[5] It had no wings or tail.[6]

Distribution and habitat[edit]

The upland moa lived only on New Zealand's South Island, in mountains and subalpine regions. They traveled to elevations as high as 2000 m (7000 ft).[5]

Behavior and ecology[edit]

Preserved head

The upland moa was herbivorous, its diet extrapolated from fossilized stomach contents, droppings, and the structure of its beak and crop. It ate leaves and small twigs, using its beak to "shear[…]with scissor-like moves" (Te Papa Museum). Its food required grinding before it could be digested, as indicated by its large crop.[5] A 2004 study of the upland moa's coprolite provided evidence that branchlets of trees such as Nothofagus, various lake-edge herbs, and tussock made up part of its diet.[7] This moa usually laid only 1 to 2 blue-green colored eggs at once.[5][8] Like the emu and ostrich, male moa cared for the young.[4] The upland moa's only predator before the arrival of humans in New Zealand was the Haast's eagle.[5]

Extinction[edit]

Humans first came in contact with the upland moa around 1250 to 1300 AD, when the Māori people arrived in New Zealand from Polynesia. Moa, a docile animal, were an easy source of food for the Māori and were eventually hunted to extinction in 1500.[5][9]

Discoveries[edit]

Preserved foot

Several specimens with soft tissue and feather remains are known:

Footnotes[edit]

  1. ^ a b Brands, S. (2008)
  2. ^ Baker, A. J.; Huynen, L. J.; Haddrath, O.; Millar, C. D.; Lambert, D. M. (2005). "Reconstructing the tempo and mode of evolution in an extinct clade of birds with ancient DNA: The giant moas of New Zealand". Proceedings of the National Academy of Sciences 102 (23): 8257. doi:10.1073/pnas.0409435102.  edit
  3. ^ Bunce, M.; Worthy, T. H.; Phillips, M. J.; Holdaway, R. N.; Willerslev, E.; Haile, J.; Shapiro, B.; Scofield, R. P.; Drummond, A.; Kamp, P. J. J.; Cooper, A. (2009). "The evolutionary history of the extinct ratite moa and New Zealand Neogene paleogeography". Proceedings of the National Academy of Sciences 106 (49): 20646. doi:10.1073/pnas.0906660106.  edit
  4. ^ a b Flannery, Tim, "A Gap in Nature: Discovering the World's Extinct Animals", October 2001, "[1]"
  5. ^ a b c d e f Museum of New Zealand, "Upland Moa", 1998, http://collections.tepapa.govt.nz/theme.aspx?irn=1348
  6. ^ TerraNature, "Flightless Birds: Moa", http://terranature.org/moa.htm
  7. ^ Mark Horrocks, et. al, "Plant remains in coprolites: diet of a subalpine moa (Dinornithiformes) from southern New Zealand", Emu Austral Ornithology, 2004 http://www.publish.csiro.au/paper/MU03019.htm
  8. ^ Igic, Branislav et al, "Detecting pigments from colorful eggshells of extinct birds", SpringerLink 2010. http://link.springer.com/article/10.1007%2Fs00049-009-0038-2?LI=true
  9. ^ Worthy, Trevor H.'Moa - Moa and people', Te Ara - the Encyclopedia of New Zealand, updated 13-Jul-12 URL: http://www.TeAra.govt.nz/en/moa/page-4
  10. ^ Museum of New Zealand(a)
  11. ^ Worthy, T. H. (1989)
  12. ^ Museum of New Zealand(b)
  13. ^ McCulloch, B. (1991)
  14. ^ Museum of New Zealand(c)

References[edit]

External links[edit]