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Megapode

Not to be confused with Macropod, kangaroos and similar marsupials.

The megapodes, also known as incubator birds or mound-builders, are stocky, medium-large, chicken-like birds with small heads and large feet in the family Megapodiidae. Their name literally means "large foot" and is a reference to the heavy legs and feet typical of these terrestrial birds. All are browsers, and all except the malleefowl occupy wooded habitats. Most are brown or black in color. Megapodes are superprecocial, hatching from their eggs in the most mature condition of any bird. They hatch with open eyes, bodily coordination and strength, full wing feathers, and downy body feathers, and are able to run, pursue prey and, in some species, fly on the day they hatch.[1]

Megapode
female Australian brushturkey (Alectura lathami)
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Galliformes
Family: Megapodiidae
Lesson, 1831
Genera
Brushturkeys can often be found in parks or gardens.

Etymology

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From the Greek μέγας (mégas = great) and πούς, (poús = foot).[2]

Description

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Megapodes are medium-sized to large terrestrial birds with large legs and feet with sharp claws. Megapodes are of three kinds: scrub fowl, brush turkeys, and mallee fowl or lowan. The largest members of the clade are the species of Alectura and Talegalla. The smallest are the Micronesian scrubfowl (Megapodius laperouse) and the Moluccan scrubfowl (Eulipoa wallacei). They have small heads, short beaks, and rounded and large wings. Their flying abilities vary within the clade. They present the hallux at the same level of the other toes just like the species of the clade Cracidae. The other Galliformes have their halluces raised above the level of the front toes.[3]

Distribution and habitat

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Megapodes are found in the broader Australasian region, including islands in the western Pacific, Australia, New Guinea, and the islands of Indonesia east of the Wallace Line, but also the Andaman and Nicobar Islands in the Bay of Bengal. The distribution of the family has contracted in the Pacific with the arrival of humans, and a number of island groups such as Fiji, Tonga, and New Caledonia have lost many or all of their species. Raoul Island, a New Zealand territory and the main island of the Kermadec Islands, may also have once had a species of megapode, based on settler accounts.[4]

Behaviour and ecology

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Australian brushturkey on its mound

Megapodes are mainly solitary birds that do not incubate their eggs with their body heat as other birds do, but bury them. Their eggs are unusual in having a large yolk, making up 50–70% of the egg weight.[5] The birds are best known for building massive nest mounds of decaying vegetation, which the male attends, adding or removing litter to regulate the internal heat while the eggs develop. However, some bury their eggs in other ways; there are burrow-nesters which use geothermal heat, and others which simply rely on the heat of the sun warming the sand. Some species vary their incubation strategy depending on the local environment.[4]

Although the Australian brushturkey was thought to exhibit temperature-dependent sex determination, this was later proven false;[6] temperature does, however, affect embryo mortality and resulting offspring sex ratios. The nonsocial nature of their incubation raises questions as to how the hatchlings come to recognise other members of their species, which is due to imprinting in other members of the order Galliformes. Research suggests an instinctive visual recognition of specific movement patterns is made by the individual species of megapode.[7]

 
This cross-section of a megapode mound shows a layer of sand (up to 1 m thick) used for insulation, an egg chamber, and a layer of rotting compost. The egg chamber is kept at a constant 33°C by opening and closing air vents in the insulation layer, while heat comes from the compost below.

Megapode chicks do not have an egg tooth; they use their powerful claws to break out of the egg, and then tunnel their way up to the surface of the mound, lying on their backs and scratching at the sand and vegetable matter. Similar to other superprecocial birds, they hatch fully feathered and active, already able to fly and live independently from their parents.[5] In megapodes superprecociality apparently evolved secondarily from brooding and at least loose parental care as more typical in Galliformes.[8] Eggs previously assigned to Genyornis have been reassigned to giant megapode species. Some dietary and chronological data previously assigned to dromornithids may instead be assigned to the giant megapodes.[9]

Megapodes share some similarities to the extinct enantiornithes in terms of their superprecocial life cycle, though also several differences.[a]

Species

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The more than 20 living species are placed in seven genera. Although the evolutionary relationships between the Megapodiidae are especially uncertain, the morphological groups are clear:[11]

Phylogeny

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Megapodiidae

Macrocephalon – maleo

Eulipoa – Moluccan megapode

Megapodius – scrubfowl (12 species)

Leipoa – malleefowl

Talegalla – brushturkeys (3 species)

Alectura – Australian brushturkey

Aepypodius – brushturkeys (2 species)

Phylogeny of the Megapodiidae based a study by Chen, Hosner, Dittmann, et al. (2021).[12] The numbers of species are from the IOU list by Gill, Donsker, & Rasmussen.[13]

Taxonomy

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Human uses

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In their native Oceania, indigenous peoples protect their nesting sites, as their eggs are considered to be delicacies.[14] Their eggs are about twice the size of chicken eggs and the yolks are roughly four times as massive.[15]

See also

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Footnotes

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  1. ^ "These feather traces and the plumage in HPG-15-1 strongly suggest that members of the Enantiornithes were born fully fledged and capable of flight soon after hatching, somewhat resembling the super-precocial megapodes, the only group of neornithines in which neonates are similarly born fledged and capable of flight (Zhou and Zhang, 2004; Jones and Göth, 2008; Xing et al., 2017). Megapodes do not fly immediately, requiring nearly two days to dig themselves out of their mounds during which they preen off their feather sheaths and let their feathers dry (Jones and Göth, 2008). Similarly, hatchling enantiornithines would have had to wait until their feather sheaths were removed and their feathers dry before attempting flight. Although ecological and behavioural differences clearly exist between enantiornithines and megapodes (e.g., enantiornithines were arboreal and not mound-nesters), megapodes represent the precocial extreme in extant neornithines and thus the closest analogue for enantiornithine development, for which all evidence indicates a form of extreme precociality (Elzanowski, 1981; Zhou and Zhang, 2004; Xing et al., 2017)."[10]

References

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  1. ^ Starck, J.M. & Ricklefs, R.E. (1998). Avian Growth and Development: Evolution within the altricial precocial spectrum. New York, NY: Oxford University Press. ISBN 978-0-19-510608-4.
  2. ^ Newton, Alfred (1911). "Megapode" . In Chisholm, Hugh (ed.). Encyclopædia Britannica. Vol. 18 (11th ed.). Cambridge University Press. p. 75.
  3. ^ del Hoyo, J.; Elliott, A.; Sargatal, J. (1994). Handbook of the Birds of the World. Vol. 2: New World Vultures to Guineafowl. Lynx Edicions. ISBN 978-84-87334-15-3.
  4. ^ a b Steadman, D. (2006). Extinction and Biogeography in Tropical Pacific Birds. University of Chicago Press. ISBN 978-0-226-77142-7.
  5. ^ a b Starck, J.M. & Sutter E. (2000). "Patterns of growth and heterochrony in moundbuilders (MEgapodiidae) and fowl (Phasianidae)". Journal of Avian Biology. 31 (4): 527–547. doi:10.1034/j.1600-048x.2000.310413.x.
  6. ^ Göth, Ann & Booth, David T. (22 March 2005). "Temperature-dependent sex ratio in a bird". Biology Letters. 1 (1): 31–33. doi:10.1098/rsbl.2004.0247. PMC 1629050. PMID 17148121.
  7. ^ Göth, A. & Evans, C.S. (2004). "Social responses without early experience: Australian brush-turkey chicks use specific visual cues to aggregate with conspecifics". Journal of Experimental Biology. 207 (13): 2199–2208. doi:10.1242/jeb.01008. PMID 15159424.
  8. ^ Harris, R.B.; Birks, S.M.; Leaché, A.D. (2014). "Incubator birds: Biogeographical origins and evolution of underground nesting in megapodes (Galliformes: Megapodiidae)". Journal of Biogeography. 41 (11): 2045–2056. doi:10.1111/jbi.12357. S2CID 53532720.
  9. ^ Worthy, Trevor H. (13 January 2016). "A case of mistaken identity for Australia's extinct big bird". theconversation.com.
  10. ^ O'Connor, Jingmai; Falk, Amanda; Wang, Min; Xiao-Ting, Zheng (3 January 2020). "First report of immature feathers in juvenile enantiornithines from the Early Cretaceous Jehol avifauna". ResearchGate. Project: Vertebrata PalAsiatica. doi:10.19615/j.cnki.1000-3118.190823.
  11. ^ Birks, S.M. & Edwards, S.V. (2002). "A phylogeny of the megapodes (Aves: Megapodiidae) based on nuclear and mitochondrial DNA sequences". Molecular Phylogenetics and Evolution. 23 (3): 408–421. doi:10.1016/s1055-7903(02)00002-7. PMID 12099795.
  12. ^ Chen, D.; Hosner, P.A.; Dittmann, D.L.; O’Neill, J.P.; Birks, S.M.; Braun, E.L.; Kimball, R.T. (2021). "Divergence time estimation of Galliformes based on the best gene shopping scheme of ultraconserved elements". BMC Ecology and Evolution. 21 (1): 209. doi:10.1186/s12862-021-01935-1. PMC 8609756. PMID 34809586.
  13. ^ Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (July 2021). "Pheasants, partridges, francolins". IOC World Bird List (Version 11.2 ed.). International Ornithologists' Union. Retrieved 23 November 2021.
  14. ^ Microlivestock: Little-known small animals with a promising economic future. National Academies Press. 1991. p. 170-171. doi:10.17226/1831. ISBN 978-0309042956. Retrieved 5 April 2022.
  15. ^ Cocker, Mark. "The Lava Birds" (PDF). Tourism Solomons. Retrieved 5 April 2022.
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