Spotted owlet

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Spotted owlet
Spotted Owlet Bokkapuram Nilgiris Sep22 A7C 02968.jpg
A. b. indica India
A pair calling in Pune
CITES Appendix II (CITES) [2]
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Strigiformes
Family: Strigidae
Genus: Athene
Species:
A. brama
Binomial name
Athene brama
(Temminck, 1821)
AthenebramaMap.svg
Synonyms

Carine brama
Noctua indicaFranklin, 1831

The spotted owlet (Athene brama) is a small owl which breeds in tropical Asia from mainland India to Southeast Asia. A common resident of open habitats including farmland and human habitation, it has adapted to living in cities. They roost in small groups in the hollows of trees or in cavities in rocks and buildings. It nests in a hole in a tree or building, laying 3–5 eggs. The species shows great variation including clinal variation in size and forms a superspecies with the very similar little owl.

Contents

Description

The spotted owlet is a small and stocky bird, barely 21 cm (8.3 in) in size. The upperparts are grey-brown, heavily spotted with white. The underparts are white, streaked with brown. The facial disc is pale and the iris is yellow. There is a white neckband and supercilium. Sexes are similar. The flight is deeply undulating. The nominate form is darker than the paler forms such as indica of drier regions. [3]

Taxonomy

Early workers sometimes treated members of this species group as subspecies of Athene noctua . The two have been separated but they are considered to form a superspecies complex. Several subspecies have been described and about four or five are widely accepted (the race poikila [4] is invalid and refers to Aegolius funereus; [5] A. b. fryi of southern India described by Stuart Baker and A. b. mayri described by Deignan from northern Thailand [6] are not usually recognized.) [7] The five widely recognized subspecies are albida Koelz, 1950 of western Asia in Iran and Pakistan; indica (Franklin, 1831) of northern India; brama (Temminck, 1821) of southern India which is darker than indica; ultra Ripley, 1948 (not always recognized) of northeastern India is said to have white spots on the mantle and "higher pitched calls"; and pulchra Hume, 1873 of Southeast Asia from Myanmar and Thailand extending into Cambodia and Vietnam. The northern and southern Indian populations intergrade and there is no dividing boundary. The northern indica populations have the upperparts brownish. Size decreases from north to south. The species is not found in Sri Lanka, although birds on the Indian mainland are found even at the tip of Rameshwaram. [8] [9]

Ecology

Behavior

Spotted owlet in Patiala, India at noon in March 2023 Spotted Owlet in Patiala 03.jpg
Spotted owlet in Patiala, India at noon in March 2023

This species is nocturnal but is often seen during the day. When disturbed from their daytime site, they bob their head and stare at intruders. [10] Their presence can often be located by the small birds that mob the owlets while they are perching in a tree during daytime.The call is a harsh and loud churring and chuckling chirurr-chirurr-chirurr ending with a chirwak-chirwak and they call mainly during early dawn or just after sunset. [3] [11] The brain has a pineal gland, formerly thought to be absent in the owls. [12] Birds show variation in the melatonin concentration between day and night. A high melatonin level is associated with sleep and low levels are associated with high alertness and foraging activity. Spotted owlets, however, show only a slightly lower melatonin concentration at night with a slight increase in the early afternoon. Other owls such as the barn owl show little day-night variation. [13] [14] Seasonal changes in glandular activity have been associated with environmental factors such as temperature and humidity. [15]

Feeding

They hunt a variety of insects and small vertebrates. In Pakistan they have been found to take mostly insect prey. [16] [17] [18] In the arid region of Jodhpur, they have been found to take more rodents (especially in the genus Mus and tend to avoid other rodents such as Tatera ) prior to the breeding season. [19] Bats, toads, small snakes such as Ramphotyphlops braminus have been noted. [20] [21] They may also take scorpions and molluscs. [22] Nests near human habitations may show higher breeding success due to increased availability of rodents for feeding young. [23]

Breeding

The breeding season is November to April. [3] Courtship behaviour includes bill grasping, allopreening and ritual feeding. The female may call with the male, bob head and deflect its tail in invitation. [24] The social organization of family groups is not clear and multiple males may copulate with a female and females may attempt pseudocopulation, [25] possibly a kind of displacement behaviour. [26] [27] They nest in cavities often competing with other hole-nesters such as mynas, rollers and parakeets. They may also nest in holes in vertical embankments. [28] The nest may be lined with leaves and feathers or may use the existing lining from a prior occupant. The typical clutch is made up of three or four spherical white eggs (30.9mm long and 26.3 mm wide, 11.6g) and incubation begins with the first laid eggs leading to a wide variation in the size of the chicks. The young are fed initially on insects such as cockroaches and later fed small vertebrate prey such as mice (a toad Bufo stomaticus has been noted in Gujarat). The chicks gain weight during the early stages but lose weight before fledging. [29] Only one or two chicks may fledge and they leave the nest in about a month. [20]

Parasites

A coccidian parasite, Eimeria atheni , has been described from this species. [30] An ectoparasitic mite, Neocheletiella athene, has been described from a specimen from the Antwerp zoo. [31] Bird lice of the species Colpocephalum pectinatum are known to be ectoparasites. [32] The Acanthocephalan parasite Apororhynchus chauhani was discovered in the intestine of the spotted owlet. [33]

Spotted owlet pair Spotted owlet by Saptarshi Gayen.jpg
Spotted owlet pair

In culture

These birds, being very familiar to humans especially with their loud calling, have been associated with bad omens. [34] The species name brama is from the French name Chouette brame and indirectly refers to this owl's Indian habitat by way of homage to Brahma, the Hindu supreme spirit. [35]

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References

  1. ↑ BirdLife International (2016). "Athene brama". IUCN Red List of Threatened Species . 2016: e.T22689332A93227068. doi: 10.2305/IUCN.UK.2016-3.RLTS.T22689332A93227068.en . Retrieved 12 November 2021.
  2. ↑ "Appendices | CITES". cites.org. Retrieved 2022-01-14.
  3. 1 2 3 Rasmussen PC & JC Anderton (2005). Birds of South Asia: The Ripley Guide. Vol. 2. Smithsonian Institution & Lynx Edicions. pp. 246–247.
  4. ↑ Lan, Yang; Li Gui-yuan (1989). "A New Subspecies of The Athene brama (Spotted Little Owl)—A. b. poikila (Belly-mottled Little Owl)". Zoological Research. 10 (4): 303–308.
  5. ↑ Sun, Yue-Hua; Bi Zhong-Lin; Wolfgang Scherzinger (2003). "Belly-mottled little owl Athene brama poikila should be boreal owl (Aegolius funereus beickianus)". Current Zoology. 49 (3): 389–392.
  6. ↑ Deignan HG (1941). "New birds from the Indo-Chinese sub-region" (PDF). The Auk. 58 (3): 396–398. doi:10.2307/4078958. JSTOR   4078958.
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  10. ↑ Ali, Salim (1996). The Book of Indian Birds (12th ed.). Oxford University Press. ISBN   0-19-561634-0.
  11. ↑ Brahmachary, R. L.; Basu, T. K.; Sengupta, A. J. (1972). "On the daily screeching time of a colony of spotted owls Athene brama (Temminck)". J. Bombay Nat. Hist. Soc. 69 (3): 649–651.
  12. ↑ Haldar, Chandana; Prasenjit Guchhait (2000). "Pineal gland of a nocturnal bird, Indian spotted owlet,Athene brama: Morphological and endocrine observations". Journal of Experimental Zoology. 287 (2): 145–150. doi:10.1002/1097-010X(20000701)287:2<145::AID-JEZ4>3.0.CO;2-K. PMID   10900433.
  13. ↑ Guchhait P, Haldar C (1999). "Circadian rhythms of melatonin and sex steroids in a nocturnal bird, Indian spotted owlet Athene brama during reproductively active and inactive phases". Biol Rhythm Res. 30 (5): 508–516. doi:10.1076/brhm.30.5.508.1400.
  14. ↑ Martin Wikelski; Elisa M. Tarlow; Corine M. Eising; Ton G.G. Groothuis; Ebo Gwinner (2005). "Do night-active birds lack daily melatonin rhythms? A case study comparing a diurnal and a nocturnal-foraging gull species" (PDF). J. Ornithol. 147 (1): 107–111. doi:10.1007/s10336-005-0018-4. S2CID   32786182. Archived from the original (PDF) on 2007-04-16.
  15. ↑ Chandana Haldar; C.C. Sudha Kumari; Prasenjit Guchhait (2002). "Seasonal Adreno-Cortical Cycle of a Nocturnal Bird, Indian Spotted Owlet Athene brama: Biochemical and Morphological Observations". Biological Rhythm Research. 33 (1): 53–63. doi:10.1076/brhm.33.1.53.1323. S2CID   85091322.
  16. ↑ Shah, Z.A. & M.A. Beg (2001). "Food of the Spotted Little Owl (Athene brama) at a place where a cropland and a sandy wasteland met". Pakistan J. Zool. 33: 53–56.
  17. ↑ Shah, Z.A. & M.A. Beg (2001). "Food of the Spotted Little Owl (Athene brama) at a place where a cropland and a Sandy wasteland met". Pakistan J. Zool. 33: 53–56.
  18. ↑ Beg, M.A.; M. Maqbool & M. Mushtaq–ul–Hassan (1990). "Food habits of spotted owlet, Athene brama". Pakistan J. Agri. Sci. 27: 127–131.
  19. ↑ Jain AP; R Advani (1983). "Winter food of spotted owlet, Athene brama indica". Journal of the Bombay Natural History Society. 80 (2): 415–416.
  20. 1 2 Anika Jadhav, Parasharya, B. M. (2003). "Some observations on the nesting behaviour and food of the spotted owlet Athene brama". Zoos' Print Journal. 18 (8): 1163–1165. doi: 10.11609/jott.zpj.18.8.1163-5 .{{cite journal}}: CS1 maint: multiple names: authors list (link)
  21. ↑ Santhanakrishnan R; Ali AHMS; Anbarasan U (2011). "Food habits and prey spectrum of Spotted Owlet (Athene brama) in Madurai District, Tamil Nadu, southern India". Chinese Birds. 2 (4): 193–199. doi: 10.5122/cbirds.2011.0027 .
  22. ↑ Pande, S.; A. Pawashe; D.B. Bastawade & P.P. Kulkarni (2004). "Scorpions and molluscs: some new dietary records for Spotted Owlet Athene brama in India". Newsletter for Ornithologists. 1 (5): 68–70.
  23. ↑ Pande, Satish; Amit Pawashe; Murlidhar N. Mahajan; Charu Joglekar & Anil Mahabal (2007). "Effect of Food and Habitat on Breeding Success in Spotted Owlets (Athene brama) Nesting in Villages and Rural Landscapes in India". Journal of Raptor Research. 41 (1): 26–34. doi: 10.3356/0892-1016(2007)41[26:EOFAHO]2.0.CO;2 . S2CID   85854496.
  24. ↑ Hassan, Mehmood-ul (2008). "Some observations on behaviour of Spotted Owlet (Athene brama) during its breeding season" (PDF). The Journal of Animal and Plant Sciences. 18 (1): 47–49. Archived from the original (PDF) on 2011-08-17.
  25. ↑ Pravin Charde & Raju Kasambe (2007). "Study of the mounting behaviour of Spotted Owlets Athene brama in Maharashtra, India" (PDF). Abstracts of World Owl Conference.
  26. ↑ Watson, Adam (1957). "The behaviour, breeding, and food-ecology of the snowy owl Nyctea scandiaca". Ibis. 99 (3): 419–462. doi:10.1111/j.1474-919X.1957.tb01959.x.
  27. ↑ Kasambe, Raju (2004). "Unusual mounting behaviour of a female Spotted Owlet (Athene brama)". Newsletter for Birdwatchers . 44 (4): 63–64.
  28. ↑ Satish Pande; Amit Pawashe; M.N. Mahajan & Anil Mahabal (2006). "Changing nest site preference for holes in earth cuttings in Spotted Owlet Athene brama" (PDF). Indian Birds. 2 (1): 7–8. Archived from the original (PDF) on 2011-07-20.
  29. ↑ Pande S, Pawashe A, Mahajan MB, Mahabal A, Yosef R, Dahanukar N (2011). "Biometry based ageing of nestling Indian Spotted Owlets ( Athene brama brama)". ZooKeys (132): 75–88. doi: 10.3897/zookeys.132.1346 . PMC   3208435 . PMID   22140335.
  30. ↑ Chauhan M.P.S.; Jain S.P. (1979). "A new coccidium, Eimeria atheni from a spotted owlet, Athene brama (Temminck)". Rivista di Parassitologia . 40: 167–169.
  31. ↑ Fain, Alex & Andre V Bochkov (2001). "On some new or little known species of parasitic Cheyletidae (Acari:Prostigmata)" (PDF). Acarologia. 52 (2): 145–160.
  32. ↑ Price, Roger D. & James R. Beer (1963). "The Species of Colpocephalum (Mallophaga: Menoponidae) Known to Occur on the Strigiformes" (PDF). Journal of the Kansas Entomological Society. 36 (1): 58–64. JSTOR   25083305.
  33. ↑ Sen, J. K. (1975). "On a new species of Apororhynchus Shipley, 1899 (Apororhynchoidea: Apororhynchidae) from India". In Tiwara, K. K.; Srivastava, C. B. (eds.). Dr. B. S. Chauhan Commemorative Volume. Orissa, India: Zoological Society of India. pp. 211–213.
  34. ↑ H. A. Rose (1910). "Panjab Folklore Notes". Folklore. 21 (2): 216–217. doi:10.1080/0015587X.1910.9719930.
  35. ↑ Pittie, Aasheesh (2004). "A dictionary of scientific bird names originating from the Indian region" (PDF). Buceros. 9 (2): 1–31. Archived from the original (PDF) on 2010-04-01. Retrieved 13 December 2009.

Sources

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  • Suresh, Kumar T. (1980). The life-history of the Spotted Owlet (Athene brama brama Temminck) in Andhra Pradesh. Raptor Research Centre, Hyderabad. Pub. No. 4.
  • Mahmood-ul-Hassan, Muhammad; Beg, Mirza Azhar; Mushtaq-ul-Hassan, Muhammad; Rana, Shahnaz Ahmed (2007). "Nesting and Breeding Habits of the Spotted Owlet (Athene brama) in Punjab, Pakistan". Journal of Raptor Research. 41 (1): 50–52. doi: 10.3356/0892-1016(2007)41[50:NABHOT]2.0.CO;2 . S2CID   85630448.
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