Common myna

Not to be confused with Common miner.
Common myna
Carrying nesting material
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Sturnidae
Genus: Acridotheres
Species: A. tristis
Binomial name
Acridotheres tristis
(Linnaeus, 1766)
Subspecies

Acridotheres tristis melanosternus
Acridotheres tristis naumanni
Acridotheres tristis tristis
Acridotheres tristis tristoides

Distribution of the common myna. Native distribution in blue, introduced in red.

The common myna (Acridotheres tristis), sometimes spelled mynah, also sometimes known as "Indian myna",[2] is a member of the family Sturnidae (starlings and mynas) native to Asia. An omnivorous open woodland bird with a strong territorial instinct, the myna has adapted extremely well to urban environments.

The range of the common myna is increasing at such a rapid rate that in 2000 the IUCN Species Survival Commission declared it one of the world's most invasive species and one of only three birds in the top 100 species that pose an impact to biodiversity, agriculture and human interests.[3] In particular, the species poses a serious threat to the ecosystems of Australia where it was named "The Most Important Pest/Problem".[4]

Description

Acridotheres tristis in Kokrebellur, India
Common Myna at Morbi, Gujarat

The common myna is readily identified by the brown body, black hooded head and the bare yellow patch behind the eye. The bill and legs are bright yellow. There is a white patch on the outer primaries and the wing lining on the underside is white. The sexes are similar and birds are usually seen in pairs. [5]

The common myna obeys Gloger's rule in that the birds from northwest India tend to be paler than their darker counterparts in South India.[6][7]

Morphometry

Morphometry.[6]

Parameter/sex MaleFemale
Average weight (gms) 109.8 120-138
Wing chord (mm) 138-153 138-147
Bill (mm) 25-30 25-28
Tarsus (mm) 34-42 35-41
Tail (mm) 81-95 79-96

Distribution

It is a species of bird native to Asia with its initial home range spanning from Iran, Pakistan, India, Nepal, Bhutan, Bangladesh and Sri Lanka; as well as Afghanistan, Uzbekistan, Tajikistan, Turkmenistan, Myanmar, to Malaysia, Singapore, peninsular Thailand, Indo-China and China.[6][8]

The myna has been introduced in many other parts of the world such as Canada, Australia, Israel, New Zealand, New Caledonia, Hawaii, South Africa, Kazakhstan, Kyrgyzstan, Florida, Uzbekistan and islands in the Indian Ocean (Seychelles, Mauritius, Réunion, Madagascar, Maldives, Andaman and Nicobar Islands and Lakshadweep archipelago) and also in islands of the Atlantic, such as Ascension and St Helena,and Pacific Oceans.[6] The range of the common myna is increasing to the extent that in 2000 the IUCN Species Survival Commission declared it among the World's 100 worst invasive species.[3]

Etymology

The etymology of the scientific name is as follows:[9]

Taxonomy and subspecies

The common myna has two subspecies:[6]

The subspecies melanosternus is darker than the nominate subspecies, has half-black and half-white primary coverts and has a larger yellow cheek-patch.[6][7] The type locality of the nominate subspecies is Puducherry, India.[9]

Behaviour

Bathing in a rain water puddle

Vocalisation

Calls
Turquoise blue-coloured egg of common myna.

The calls includes croaks, squawks, chirps, clicks, whistles and 'growls', and the bird often fluffs its feathers and bobs its head in singing. The common myna screeches warnings to its mate or other birds in cases of predators in proximity or when it is about to take off flying.[10] Common mynas are popular as cage birds for their singing and "speaking" abilities. Before sleeping in communal roosts, mynas vocalise in unison, which is known as "communal noise".[11]

Breeding

Common mynas are believed to pair for life. They breed through much of the year depending on the location, building their nest in a hole in a tree or wall. They breed from sea-level to 3000 m in the Himalayas.[6]

The normal clutch size is 4–6 eggs. The average size of the egg is 30.8 x 21.99 mm. The incubation period is 17 to 18 days and fledging period is 22 to 24 days.[6] The Asian koel is sometimes brood parasitic on this species.[12] Nesting material used by mynas include twigs, roots, tow and rubbish. Mynas have been known to use tissue paper, tin foil and sloughed off snake-skin.[6]

During the breeding season, the daytime activity-time budget of common myna in Pune in April to June 1978 has been recorded to comprise the following: nesting activity (42%), scanning the environment (28%), locomotion (12%), feeding (4%), vocalisation (7%) and preening-related activities, interactions and other activities (7%).[13]

The common myna uses the nests of woodpeckers, parakeets, etc. and easily takes to nest boxes; it has been recorded evicting the chicks of previously nesting pairs by holding them in the beak and later sometimes not even using the emptied nest boxes. This aggressive behaviour contributes to its success as an invasive species.[14]

Common myna evicting a nest of jungle babbler. Breaking the eggs of jungle babbler.

Food and feeding

Common Myna prey on Grasshopper

Like most starlings, the common myna is omnivorous. It feeds on insects, arachnids, crustaceans, reptiles, small mammals, seeds, grain and fruits and discarded waste from human habitation. It forages on the ground among grass for insects, and especially for grasshoppers, from which it gets the generic name Acridotheres, "grasshopper hunter". It however feeds on a wide range of insects, mostly picked from the ground.[6][15] It is a cross-pollinator of flowers such as Salmalia and Erythrina. It walks on the ground with occasional hops and is an opportunistic feeder on the insects disturbed by grazing cattle as well as fired grass fields.[6]

Roosting behaviour

Basking

Common mynas roost communally throughout the year, either in pure or mixed flocks with jungle mynas, rosy starlings, house crows, jungle crows, cattle egrets and rose-ringed parakeets and other birds. The roost population can range from less than one hundred to thousands.[16][17] The time of arrival of mynas at the roost starts before and ends just after sunset. The mynas depart before sunrise. The time and timespan of arrival and departure, time taken for final settlement at the roost, duration of communal sleep, flock size and population vary seasonally.[11][18][19]

The function of communal roosting is to synchronise various social activities, avoid predators, exchange information about food sources.[20]

Communal displays (pre-roosting and post-roosting) consist of aerial maneuvers which are exhibited in the pre-breeding season (November to March). It is assumed that this behaviour is related to pair formation.[21]

Habitat

This abundant passerine is typically found in open woodland, cultivation and around habitation. Although this is an adaptable species, its population has been decreasing significantly in Singapore and Malaysia (where it is locally called as gembala kerbau, literally 'buffalo shepherd') due to competition with its cousin, the introduced Javan myna.[22]

Urban success

A common myna visits a home garden in Colombo, Sri Lanka.
Captive Indian myna housed with Javan myna

The common myna thrives in urban and suburban environments; in Canberra, for instance, 110 common mynas were released between 1968 and 1971. By 1991, common myna population density in Canberra averaged 15 birds per square kilometer.[23] Only three years later, a second study found an average population density of 75 birds per square kilometer in the same area.[24]

The bird likely owes its success in the urban and suburban settings of Sydney and Canberra to its evolutionary origins; having evolved in the open woodlands of India, the common myna is pre-adapted to habitats with tall vertical structures and little to no vegetative ground cover,[25] features characteristic of city streets and urban nature preserves.

The common myna (along with European starlings, house sparrows, and feral rock pigeons) is a nuisance to city buildings; its nests block gutters and drainpipes, causing water damage to building exteriors.[26]

Invasive species

The IUCN declared this myna as one of the only three birds among the world's 100 worst invasive species.[3] (The other two invasive birds are the red-vented bulbul and the European starling.) It has been introduced widely elsewhere, including adjacent areas in Southeast Asia, Madagascar,[27] the Middle East, South Africa, Madagascar, Israel, United States, Argentina, Germany, United Kingdom, Australia, New Zealand and various oceanic islands in the Indian and Pacific Oceans, including prominent populations in Fiji and Hawaii.[8][28]

The common myna is a pest in South Africa, North America, the Middle East, Australia, New Zealand and many Pacific islands. It is particularly problematic in Australia. Several methods have been tried to control the bird's numbers and protect native species.

Australia

In Sydney, Australia

In Australia, the common myna is an invasive pest. They are now often the predominant bird in urban areas all along the East coast. In a 2008 popular vote, the bird was named "The Most Important Pest/Problem" in Australia, also earning the nickname "flying rats" due to their scavenging resembling that of rats.[4]

The common myna was first introduced to Australia in Victoria between 1863 and 1872 into Melbourne’s market gardens to control insects. The bird is likely to have spread to New South Wales (where it is currently most populous) at around the same time, but documentation is uncertain.[29] The bird was later introduced to Queensland as a predator of grasshoppers and cane beetles. Currently, common myna populations in Australia are concentrated along the eastern coast around Sydney and its surrounding suburbs, with sparser populations in Victoria and a few isolated communities in Queensland.[30] During 2009 several municipal councils in New South Wales began trials of catching myna birds in an effort to reduce numbers.[31]

The bird can live and breed in a wide range of temperatures, ranging from the harsh winters of Canberra to the tropical climate of Cairns. Self-sustaining populations of common myna have been found in regions of mean warmest month temperature no less than 23.2 °C and mean coldest month temperature no less than -0.4 °C, implying that the common myna could potentially spread from Sydney northward along the eastern coast to Cairns and westward along the southern coast to Adelaide (though not to Tasmania, Darwin, or the arid interior regions).[32]

New Zealand

The Indian myna was introduced to both the North Island and South Island of New Zealand in the 1870s. However, the cooler summer temperatures in the South Island appear to have impeded the breeding success rate of the southern populations, preventing the proliferation of the species, which was largely non-existent there by the 1890s. In contrast, the North Island population was able to breed more successfully and large portions of the North Island are now populated. However, in the southern reaches of the North Island, the cooler summer temperatures, like those of the South Island, have prevented the establishment of large Indian myna populations.[33]

South Africa

In South Africa where it escaped into the wild in 1902, it has become very common and its distribution is greater where human populations are greater or where there is more human disturbance.[34] The bird is also notorious for being a pest, kicking other birds out of their nests and killing their young due to the myna's strong territorial instinct. In South Africa it is considered somewhat of a major pest and disturbance of the natural habitat; as a result, they are frequently shot and killed by people in urban environments and farmers alike. Bylaws in South Africa pertaining to the protection of most animal species specifically exclude mynas from this protection.

Morphological studies show that the process of spatial sorting is at work on the range expansion of A. tristis in South Africa.[35] Dispersal-relevant traits are significantly correlated with distance from the range core, with strong sexual dimorphism, indicative of sex-biased dispersal. Morphological variations are significant in wing and head traits of females, suggesting females as the primary dispersing sex. In contrast, traits not related to dispersal such as those associated with foraging show no signs of spatial sorting but are significantly affected by environmental variables such as vegetation and intensity of urbanisation.

To study the invasion genetics and landscape-scale dynamics of A. tristis, scientists have recently developed 16 polymorphic nuclear microsatellite markers [36] using the next generation sequencing (NGS) approach.

Effect on ecosystems and humans

Threat to native birds

Immature at nest, West Bengal

The common myna is a hollow-nesting species; that is, it nests and breeds in protected hollows found either naturally in trees or artificially on buildings (for example, recessed windowsills or low eaves).[37] Compared to native hollow-nesting species, the common myna is extremely aggressive, and breeding males will actively defend areas ranging up to 0.83 hectares in size (though males in densely populated urban settings tend to only defend the area immediately surrounding their nests).[38]

This aggressiveness has enabled the common myna to displace many breeding pairs of native hollow-nesters, thereby reducing their reproductive success. In Australia, their aggressiveness has enabled them to chase native birds as large as galahs out of their nests.

The common myna is also known to maintain up to two roosts simultaneously; a temporary summer roost close to a breeding site (where the entire local male community sleeps during the summer, the period of highest aggression), and a permanent all-year roost where the female broods and incubates overnight. Both male and female common mynas will fiercely protect both roosts at all times, leading to further exclusion of native birds.[38]

Threat to crops and pasture

The common myna (which feeds mostly on ground-dwelling insects, tropical fruits such as grapes, plums and some berries and, in urban areas, discarded human food)[39] poses a serious threat to Australian blueberry crops, though its main threat is to native bird species.[40]

In Hawaii, where the common myna was introduced to control pest armyworms and cutworms in sugarcane crops, the bird has helped to spread the robust Lantana camara weed across the islands’ open grasslands.[41] It also has been recorded as the fourth-ranking avian pest in the fruit industry by a 2004 survey of the Hawaiian Farm Bureau and the sixth in number of complaints of avian pests overall.[42]

In culture

The common myna widely appears under the name saarika in Indian culture from Vedic times, featuring both in classical Indian literature (Sanskrit) as well as in Prakrit Buddhist texts. The Sankrit term shuksarika, which refers to the rose-ringed parakeet (shuk) and the common myna (saarika), is used to indicate a pair or a couple, probably because both birds are vocal and capable of mimicking human sound.[43]

In Sanskrit literature, the common myna has a number of names, most are descriptive of the appearance or behaviour of the bird. In addition to saarika, the names for the common myna include kalahapriya, which means "one who is fond of arguments" referring to the quarrelsome nature of this bird; chitranetra, meaning "picturesque eyes"; peetanetra (one with yellow eyes) and peetapaad (one with yellow legs).[44]

References

  1. ↑ BirdLife International (2012). "Acridotheres tristis". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
  2. ↑ http://www.yimag.org.au/indian-myna-identification.html
  3. 1 2 3 Lowe S., Browne M., Boudjelas S. and de Poorter M. (2000). 100 of the World’s Worst Invasive Alien Species. A selection from the Global Invasive Species Database. The Invasive Species Specialist Group (ISSG), a specialist group of the Species Survival Commission (SSC) of the World Conservation Union (IUCN), Auckland.
  4. 1 2 "ABC Wildwatch". Abc.net.au. Retrieved 2012-08-07.
  5. ↑ Rasmussen, PC & JC Anderton (2005). Birds of South Asia: The Ripley Guide. Vol 2. Smithsonian Institution & Lynx Edicions. p. 584.
  6. 1 2 3 4 5 6 7 8 9 10 11 Ali, Salim; Ripley, S. Dillon (2001). Handbook of the Birds of India and Pakistan, Volume 5 (2 (paperback) ed.). India: Oxford University Press. p. 278. ISBN 0-19-565938-4.
  7. 1 2 Rasmussen, Pamela C.; Anderton, John C. (2005). Birds of South Asia - The Ripley Guide (volume 2). Smithsonian Institution, Washington & Lynx edicions, Barcelona. pp. 584, 683. ISBN 84-87334-66-0.
  8. 1 2 "Common Myna". Retrieved December 23, 2007.
  9. 1 2 Pande, Satish (2009). Latin names of Indian birds explained. Mumbai: Bombay Natural History Society and Oxford University Press. pp. 417, 506. ISBN 978-0-19-806625-5.
  10. ↑ Griffin, Andrea S. (2008). "Social learning in Indian mynahs, Acridotheres tristis: the role of distress calls.". Animal Behaviour 75 (1): 79–89. doi:10.1016/j.anbehav.2007.04.008.
  11. 1 2 Mahabal, Anil; Vaidya, V.G. (1989). "Diurnal rhythms and seasonal changes in the roosting behaviour of Indian Myna Acridotheres tristis (Linnaeus)". Proceedings of Indian Academy of Sciences (Animal Science) (Indian Academy of Sciences, Bangalore) 98 (3): 199–209. doi:10.1007/BF03179646. Retrieved 22 January 2011.
  12. ↑ Choudhury A. (1998). "Common Myna feeding a fledgling koel". Journal of the Bombay Natural History Society 95 (1): 115.
  13. ↑ Mahabal, Anil (1991). "Activity-time budget of Indian Myna Acridotheres tristis (Linnaeus) during the breeding season". Journal of the Bombay Natural History Society (Bombay Natural History Society) 90 (1): 96–97. Retrieved 22 January 2011.
  14. ↑ Pande, Satish; Tambe, Saleel; Clement, Francis M; Sant, Niranjan (2003). Birds of Western Ghats, Kokan and Malabar (including birds of Goa). Mumbai: Bombay Natural History Society & Oxford University Press. pp. 312, 377. ISBN 0-19-566878-2.
  15. ↑ Mathew, DN; Narendran, TC; Zacharias, VJ (1978). "A comparative study of the feeding habits of certain species of Indian birds affecting agriculture". J. Bombay Nat. Hist. Soc. 75 (4): 1178–1197.
  16. ↑ Mahabal, Anil; Bastawade, D.B. (1991). "Mixed roosting associates of Indian Myna Acridotheres tristis in Pune city, India". Pavo (Department of Zoolgy, Maharaja Sayajirao Gaikwad University, Vadodara) 29 (1 & 2): 23–32. Retrieved 22 January 2011.
  17. ↑ Mahabal, Anil (1992). "Diurnal intra- and inter-specific assemblages of Indian Mynas". Biovigyanam (Maharashtra Association for the Cultivation of Science, Pune) 18 (2): 116–118. Retrieved 22 January 2011.
  18. ↑ Mahabal, Anil; Bastawade, D.B.; Vaidya, V.G. (1990). "Spatial and temporal fluctuations in the population of Common Myna Acridotheres tristis (Linnaeus) in and around an Indian City". Journal of Bombay Natural History Society (Bombay Natural History Society, Mumbai) 87 (3): 392–398. Retrieved 22 January 2011.
  19. ↑ Mahabal, Anil (1993). "Seasonal changes in the flocking behaviour of Indian Myna Acridotheres tristis (Linnaeus)". Biovigyanam (Maharashtra Association for the Cultivation of Science, Pune) 19 (1 & 2): 55–64. Retrieved 22 January 2011.
  20. ↑ Mahabal, Anil (1997). "Communal roosting in Common Mynas and its functional significanca". Journal of Bombay Natural History Society (Bombay Natural History Society, Mumbai) 94 (2): 342–349. Retrieved 22 January 2011.
  21. ↑ Mahabal, Anil (1993). "Communal display behaviour of Indian Myna Acridotheres tristis (Linnaeus)". Pavo (Department of Zoolgy, Maharaja Sayajirao Gaikwad University, Vadodara) 31 (1&2): 45–54.
  22. ↑ "Ubiquitous Javan Myna". Bird Ecology Study Group, Nature Society (Singapore). Besgroup.blogspot.com. Retrieved October 25, 2007.
  23. ↑ Pell, A.S.; C.R. Tidemann (1997). "The Ecology of the Common Myna in Urban Nature Reserves in the Australian Capital Territory" (PDF). Emu (Royal Australasian Ornithologists Union) 97 (2): 141–149. doi:10.1071/MU97018.
  24. ↑ Pell 1997, p.146
  25. ↑ Pell 1997, p.141
  26. ↑ Bomford, M.; Ron Sinclair (2002). "Australian research on bird pests: impact, management and future directions" (PDF). Emu (Royal Australasian Ornithologists Union) 102: 35. doi:10.1071/MU01028.
  27. ↑ Wilme, Lucienne (1996). "Composition and characteristics of bird communities in Madagascar" (PDF). Biogéographie de Madagascar: 349–362.
  28. ↑ Long, John L. (1981). Introduced Birds of the World. Agricultural Protection Board of Western Australia, 21-493
  29. ↑ Hone, J. (1978). "Introduction and Spread of the Common Myna in New South Wales" (PDF). Emu (Royal Australasian Ornithologists Union) 78 (4): 227. doi:10.1071/MU9780227.
  30. ↑ Martin, W.K. (1996). "The Current and Potential Distribution of the Common Myna Acridotheres tristis in Australia" (PDF). Emu (Royal Australasian Ornithologists Union) 96 (3): 169–170. doi:10.1071/MU9960166.
  31. ↑ Vikki, By (2009-05-12). "Councils assessing backyard traps to catch Indian Mynah birds | thetelegraph.com.au". Dailytelegraph.com.au. Retrieved 2012-08-07.
  32. ↑ Martin 1996, pp.169–170
  33. ↑ http://www.teara.govt.nz/en/introduced-land-birds/page-9
  34. ↑ Derick S. Peacock, Berndt J. van Rensburg and Mark P. Robertson (2007). "The distribution and spread of the invasive alien Common Myna, Acridotheres tristis L. (Aves: Sturnidae), in southern Africa". South African Journal of Science 103: 465–473.
  35. ↑ Berthouly-Salazar, C.; van Rensburg, B.J.; van Vuuren, B.J.; Hui, C. (2012). "Spatial sorting drives morphological variation in the invasive bird, Acridotheres tristis". PLoS ONE 7 (5): e38145. doi:10.1371/journal.pone.0038145.
  36. ↑ Berthouly-Salazar, C.; Cassey, P.; van Vuuren, B.J.; van Rensburg, B.J.; Hui, C.; le Roux, J.J. (2012). "Development and characterization of 13 new, and cross amplification of 3, polymorphic nuclear microsatellite loci in the Common myna (Acridotheres tristis)". Conservation Genetics Resources 4: 621–624. doi:10.1007/s12686-012-9607-8.
  37. ↑ Bomford 2002, p.34
  38. 1 2 Pell 1997, p.148
  39. ↑ Pell 1997, p.147
  40. ↑ Bomford 2002, p.30
  41. ↑ Pimentel, D.; Lori Lach; Rodolfo Zuniga; Doug Morrison (January 2000). "Environmental and Economic Costs of Nonindigenous Species in the United States". BioScience (American Institute of Biological Sciences) 50 (1): 53–56. doi:10.1641/0006-3568(2000)050[0053:EAECON]2.3.CO;2.
  42. ↑ Koopman, ME & W C Pitt (2007). "Crop diversification leads to diverse bird problems in Hawaiian agriculture" (PDF). Human–Wildlife Conflicts 1 (2): 235–243.
  43. ↑ Pande, Dr Suruchi. (2007). Some reflections on birds in Sanskrit literature. (A Thesis submitted for the degree of Vidyavachaspati (PhD) (Sanskrit) awarded from Shri Balmukund Lohiya Centre of Sanskrit and Indological Studies, Tilak Maharashtra Vidyapeeth, Pune).
  44. ↑ Dave, K. N. (2005). Birds in Sanskrit Literature (revised ed.). Delhi: Motilal Banarsidass Private Ltd. pp. 468, 516. ISBN 81-208-1842-3.

Further reading

External links

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