Banasura laughingthrush

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Banasura laughingthrush
TrochalopteronJerdoniSmit.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Leiothrichidae
Genus: Montecincla
Species:
M. jerdoni
Binomial name
Montecincla jerdoni
(Blyth, 1851)
Synonyms

Montecincla cachinnans jerdoni

The Banasura laughingthrush (Montecincla jerdoni) is a species of bird in the family Leiothrichidae. It is found in shola habitat in a small section of the Western Ghats in southwestern Karnataka and northern Kerala. It was formerly considered a subspecies of the black-chinned laughingthrush.

Contents

Taxonomy

The Banasura laughingthrush was described by zoologist Edward Blyth in 1851, based on a type specimen collected at Banasura Hill in modern-day Kerala by Thomas Jerdon. [1] Blythe originally placed it in the genus Garrulax . After a period of taxonomic reorganization, the species, along with the Palani laughingthrush and the Ashambu laughingthrush, was placed in the genus Montecincla , in which it remains today.

The Banasura laughingthrush was formerly treated as conspecific with the Nilgiri laughingthrush, and was known as the black-chinned laughingthrush. However, morphological and geographic analysis revealed that the Banasura and Nilgiri laughingthrushes were better treated as different species entirely, due to apparent allopatric speciation, [2] and the Banasura laughingthrush was consequently awarded full species status in 2015. [3] Later genetic analysis corroborated the validity of the split. [4]

The Banasura laughingthrush is genetically most closely related to the Nilgiri laughingthrush, and the two species are estimated to have diverged about 330,000 years before the present. [4]

Description

Banasura laughingthrush in Wayanad Banasura Chilappan, Montecincla jerdoni.jpg
Banasura laughingthrush in Wayanad

The Banasura laughingthrush is a medium-sized songbird, ranging between 203 and 230 cm in length, and between 36 and 52 g in mass. Adults have a black face and throat; white supercilia; a gray breast, cheeks, and back; an ochre belly; and olive back, wings, and tail. Additionally, adults have a black bill, crimson irises, and brownish legs. It is distinguished from the Nilgiri laughingthrush by its gray breast, and from the Palani and Ashambu laughingthrushes by its black chin. The sexes are indistinguishable in plumage. [5]

While the Banasura laughingthrush is extremely similar in appearance to other species within Montecincla, it is the only species of its genus found within its range, making identification straightforward.

Distribution and habitat

The Banasura laughingthrush has an extremely restricted range. It is endemic to a small series of sky islands in the Western Ghats in South India, between the Brahmagiri Hills of Kodagu in the north and Vavul Mala in Kerala in the south. Within this range, fragmented populations are found at Banasura Hill in Wayanad, Chembra Peak, and Vellarimala. [5]

The Banasura laughingthrush is primarily found in shola habitat between 1,400 and 2,400 meters in elevation.

Behavior and ecology

The Banasura laughingthrush forages in the shola midstory and lower canopy by hopping among branches, feeding primarily on fruits and insects. Individual birds are fairly sedentary, and do not regularly travel between sholas. [5]

Like other Montecincla laughingthrushes, the Banasura laughingthrush is highly vocal. The most typical song type is a series of 3 to 6 loud, nasally whistles, but this song is highly variable, with various 2, 3, 4, and 6-note songs being well documented. While the Banasura laughingthrush's song cannot always be distinguished from that of the Nilgiri laughingthrush, analyses have shown the Banasura laughingthrush's song to be generally higher in complexity than any of the other Montecincla laughingthrushes. [4]

Conservation

Due to its extremely small range of under 57 km², the population of the Banasura laughingthrush is estimated at only around 500-2,500 adults. [2] The Banasura laughingthrush's range is also highly fragmented, rendering the species even more vulnerable to declines due to habitat loss and degradation. Due to its small population size and range, the species is ranked by the IUCN as Endangered. [6]

The Carmel Hump Mountains Important Bird Area was designated specifically to protect crucial habitat for the Banasura laughingthrush.

Related Research Articles

<span class="mw-page-title-main">Western Ghats</span> Mountain range along the western coast of India

The Western Ghats, also known as the Sahyadri mountain range, is a mountain range that covers an area of 160,000 km2 (62,000 sq mi) in a stretch of 1,600 km (990 mi) parallel to the western coast of the Indian peninsula, traversing the states of Gujarat, Maharashtra, Goa, Karnataka, Kerala and Tamil Nadu. It is a UNESCO World Heritage Site and one of the 36 biodiversity hotspots in the world. It is sometimes called the Great Escarpment of India. It contains a very large proportion of the country's flora and fauna, many of which are endemic to this region. The Western Ghats are older than the Himalayas. They influence Indian monsoon weather patterns by intercepting the rain-laden monsoon winds that sweep in from the south-west during late summer. The range runs north to south along the western edge of the Deccan Plateau and separates the plateau from a narrow coastal plain called the Western Coastal Plains along the Arabian Sea. A total of 39 areas in the Western Ghats, including national parks, wildlife sanctuaries and reserve forests, were designated as world heritage sites in 2012 – twenty of them in Kerala, ten in Karnataka, six in Tamil Nadu and four in Maharashtra.

<span class="mw-page-title-main">South Western Ghats montane rain forests</span> Ecoregion in South India

The South Western Ghats montane rain forests is an ecoregion in South India, covering the southern portion of the Western Ghats in Karnataka, Kerala and Tamil Nadu at elevations from 1,000 to 2,695 m. Annual rainfall in this ecoregion exceeds 2,800 mm (110 in).

<span class="mw-page-title-main">Nilgiri tahr</span> Species of mammal

The Nilgiri tahr is an ungulate that is endemic to the Nilgiri Hills and the southern portion of the Western and Eastern Ghats in the states of Tamil Nadu and Kerala in southern India. It is the only species in the genus Nilgiritragus and is closely related to the sheep of the genus Ovis.

<span class="mw-page-title-main">Shola</span> Patch of stunted tropical montane forest in South India

Sholas are the local name for patches of stunted tropical montane forest found in valleys amid rolling grassland in the higher montane regions of South India, largely in Kerala, Karnataka and Tamilnadu. These patches of shola forest are found mainly in the valleys and are usually separated from one another by undulating montane grassland. The shola and grassland together form the shola-grassland complex or mosaic. Not all such high-elevation grasslands have sholas in their valleys, especially if they are isolated from other such meadows, such as the meadows found in the Idamalayar Reserve Forest in Ernakulam district of Kerala. The word 'Shola' is probably derived from the Tamil language word cõlai (சோலை) meaning grove.

<span class="mw-page-title-main">Nilgiri Biosphere Reserve</span> International biosphere reserve of India

The Nilgiri Biosphere Reserve is a biosphere reserve in the Nilgiri Mountains of the Western Ghats in South India. It is the largest protected forest area in India, spreading across Tamil Nadu, Karnataka and Kerala. It includes the protected areas Mudumalai National Park, Mukurthi National Park, Sathyamangalam Wildlife Sanctuary in Tamil Nadu; Nagarhole National Park, Bandipur National Park, both in Karnataka; Silent Valley National Park, Aralam Wildlife Sanctuary, Wayanad Wildlife Sanctuary, and Karimpuzha Wildlife Sanctuary in Kerala.

<span class="mw-page-title-main">Mukurthi National Park</span> National park in India

Mukurthi National Park (MNP) is a 78.46 km2 (30.3 sq mi) protected area located in the western corner of the Nilgiris Plateau west of Ootacamund hill station in the northwest corner of Tamil Nadu state in the Western Ghats mountain range of South India. The park was created to protect its keystone species, the Nilgiri tahr.

<span class="mw-page-title-main">Eravikulam National Park</span> National park in India

Eravikulam National Park is a 97 km2 national park located along the Western Ghats in the Idukki and Ernakulam districts of Kerala in India. The park is situated between 10º05'N and 10º20' north, and 77º0' and 77º10' east and is the first national park in Kerala. It was established in 1978.

<span class="mw-page-title-main">Black-and-orange flycatcher</span> Species of bird

The black-and-orange flycatcher or black-and-rufous flycatcher is a species of flycatcher endemic to the central and southern Western Ghats, the Nilgiris and Palni hill ranges in southern India. It is unique among the Ficedula flycatchers in having rufous coloration on its back and prior to molecular studies was suggested to be related to the chats and thrushes.

<span class="mw-page-title-main">Nilgiri laughingthrush</span> Species of bird

The Nilgiri laughingthrush is a species of laughingthrush endemic to the high elevation areas of the Nilgiris and adjoining hill ranges in Peninsular India. The mostly rufous underparts, olive brown upperparts, a prominent white eyebrow and a black throat make it unmistakable. It is easily detected by its loud series of nasal call notes and can be hard to spot when it is hidden away inside a patch of dense vegetation. The species has a confusing taxonomic history, leading to a range of names. In the past the species was considered to have two subspecies, the nominate form in the Nilgiris and jerdoni with a grey upper breast and found in the Brahmagiris of Coorg and Banasura range of Wayanad. They are omnivorous, feeding on a range of insects, berries and nectar.

<span class="mw-page-title-main">Nilgiri blue robin</span> Species of bird

The Nilgiri blue robin, also known as Nilgiri shortwing, white-bellied shortwing, Nilgiri sholakili or rufous-bellied shortwing is a species of passerine bird in the family Muscicapidae endemic to the Shola forests of the higher hills of southern India, mainly north of the Palghat Gap. This small bird is found on the forest floor and undergrowth of dense forest patches sheltered in the valleys of montane grassland, a restricted and threatened habitat.

<span class="mw-page-title-main">Wayanad laughingthrush</span> Species of bird

The Wayanad laughingthrush is a species of laughingthrush in the family Leiothrichidae. It is endemic to the Western Ghats south of Goa in India. These laughingthrushes move in groups in dense forests, producing loud calls but tend to be hard to spot in the undergrowth. They have brown upperparts, a white throat, a broad black mask through the eye and a heavy bill with pale yellow on the lower mandible. Despite the name, derived from the Wayanad region, this species has a wider range than the four other south Indian species of laughingthrush that are restricted to the higher elevation hills.

<span class="mw-page-title-main">Palani laughingthrush</span> Species of bird

The Palani laughingthrush is a species of laughingthrush endemic to the hills of the Western Ghats south of the Palghat Gap in Southern India. Found in the high montane forests, this grey bibbed, rufous bellied bird with a prominent dark eyestripe and broad white brow was grouped along with the grey-breasted subspecies of the black-chinned laughingthrush and known as the grey-breasted laughingthrush. This species is found in the Palni Hills while another closely related form, the Ashambu laughingthrush with a shorter white brow is found in the high hills south of the Achankovil Gap and was treated as a subspecies. The two forms were together treated under the name of Kerala laughingthrush.

<span class="mw-page-title-main">White-bellied blue robin</span> Species of bird

The white-bellied blue robin or white-bellied sholakili, is a bird of the family Muscicapidae. It is endemic to the Shola forests of the higher hills of southern India. The Nilgiri blue robin and this species were once considered separate species, later lumped as sub-species of a single species (major) and elevated again to full species in 2005 by Pamela C. Rasmussen. The species was earlier thought to be related to the shortwings and placed in the genus Brachypteryx and later moved to Myiomela since species in the genus Brachypteryx shows marked sexual dimorphism. In 2017, a study found that this is a sister group of the flycatchers in the genera Niltava, Cyornis and Eumyias among others. It was then placed in newly erected genus Sholicola. This small bird is found on the forest floor and undergrowth of dense forest patches sheltered in the valleys of montane grassland, a restricted and threatened habitat.

<span class="mw-page-title-main">Pampadum Shola National Park</span> National park in India

Pampadum Shola National Park is the smallest national park in Idukki district of Kerala in India. It is on the border with Kodaikanal, Dindigul district of Tamil Nadu. The park is administered by the Kerala Department of Forests and Wildlife, Munnar Wildlife Division, together with the nearby Mathikettan Shola National Park, Eravikulam National Park, Anamudi Shola National Park, Chinnar Wildlife Sanctuary and the Kurinjimala Sanctuary. The park adjoins the Allinagaram Reserved Forest within the proposed Palani Hills Wildlife Sanctuary and National Park.It is a part of Palani hills stretched up to Vandaravu peak. The Westerns Ghats, Anamalai Sub-Cluster, including these parks, is under consideration by the UNESCO World Heritage Committee for selection as a World Heritage Site.

<span class="mw-page-title-main">Berijam Lake</span> Freshwater reservoir in Tamil Nadu, South India

Berijam Lake is a reservoir near Kodaikanal town in Dindigul district of Tamil Nadu, South India. It is at the old site of "Fort Hamilton", in the upper Palani hills. The lake, created by a dam with sluice outlets, is part of a micro–watershed development project. Periyakulam town, 18.7 kilometres (11.6 mi) to the SE, gets its public drinking water from the lake. The lake's water quality is excellent.

<i>Trochalopteron</i> Genus of birds

Trochalopteron is a genus of passerine birds in the laughingthrush family Leiothrichidae.

The black-chinned laughingthrush or rufous-breasted laughingthrush has been split into the following species:

<i>Montecincla</i> Genus of birds

Montecincla is a genus of passerine birds in the family Leiothrichidae. All four species in this genus are endemic to “sky islands” in the Western Ghats mountain range of southwestern India, generally above 1,200m elevation.

<span class="mw-page-title-main">Ashambu laughingthrush</span> Species of bird

The Ashambu laughingthrush or Travancore laughingthrush is a species of bird in the family Leiothrichidae. It is found in the Western Ghats in southern Kerala and southern Tamil Nadu. It was formerly considered a subspecies of the grey-breasted laughingthrush. It is closely related to the Palani laughingthrush and can be differentiated from it by its very short white brow that stops before the eye.

References

  1. Blyth, E. (1851). Notice of a collection of Mammalia, birds, and reptiles, procured at or near the station of Chérra Punji in the Khásia Hills, north of Sylhet. Journal of the Asiatic Society of Bengal XX (Part II): 517–524.
  2. 1 2 Praveen, J., and P. O. Nameer (2013). Strophocincla laughingthrushes of south India: a case for allopatric speciation and impact on their conservation. Journal of the Bombay Natural History Society 109(1–2): 46–52.
  3. del Hoyo, J., and N. J. Collar (2016). HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2. Passerines. Lynx Edicions, Barcelona, Spain.
  4. 1 2 3 Robin, V. V., C. K. Vishnudas, P. Gupta, F. E. Rheindt, D. M. Hooper, U. Ramakrishnan, and S. Reddy (2017). Two new genera of songbirds represent endemic radiations from the Shola Sky Islands of the Western Ghats, India. BMC Evolutionary Biology 17: 31.
  5. 1 2 3 Praveen J. (2020). Banasura Laughingthrush (Montecincla jerdoni), version 2.0. In Birds of the World (P. G. Rodewald, B. K. Keeney, and S. M. Billerman, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.bkclau1.02
  6. BirdLife International (2020). Species factsheet: Montecincla jerdoni.