Western chat-tanager

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Western chat-tanager
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Class: Aves
Order: Passeriformes
Family: Calyptophilidae
Genus: Calyptophilus
Species:
C. tertius
Binomial name
Calyptophilus tertius
Wetmore, 1929
Calyptophilus tertius map.svg
Synonyms

Calyptophilus frugivorus tertius [2]

The western chat-tanager (Calyptophilus tertius) is a Vulnerable species of passerine bird belonging to the family Calyptophilidae. It is endemic to the island of Hispaniola which is shared by the Dominican Republic and Haiti. [3] [1]

Contents

Taxonomy and systematics

The western chat-tanager shares its genus with the eastern chat-tanager (C. frugivorus), and was previously treated as a subspecies of it. There is a high degree of divergence between the two in mitochondrial DNA and intron sequences. Speciation is likely to have occurred on two ancient islands, which later fused to form present-day Hispaniola. [2] The genus was long included in the family Thraupidae, the "true" tanagers, but it was moved in 2017. [4] The western chat-tanager is monotypic. [3]

Description

The western chat-tanager is 20 to 21 cm (7.9 to 8.3 in) long and weighs about 40 to 55 g (1.4 to 1.9 oz). It has a long bill and tail, so it somewhat resembles a mockingbird's shape. The sexes have the same plumage. Adults have a dark olive-brown head, with a blackish crown and a small rusty spot between the eye and bill. The rest of their upperparts are dark reddish brown. Their throat and underparts are white, with a heavy wash of grayish brown on the flanks and lower belly. [5]

Distribution and habitat

The western chat-tanager is found throughout Hispaniola's highest mountain ranges, in southwestern Haiti's Massif de la Hotte and Chaîne de la Selle and the adjacent Sierra de Bahoruco in the southwestern Dominican Republic. It inhabits broadleaf forest and dense brushy areas, especially in ravines and near water. In elevation it occurs between 745 and 2,200 m (2,444.23 and 7,217.85 ft). [5]

Behavior

Movement

The western chat-tanager is a year-round resident throughout its range. It is secretive and usually encountered on or near the ground. [5]

Feeding

The feeding behavior and diet of the western chat-tanager are not well known. Both are apparently similar to those of the eastern chat-tanager. That species forages on or near the ground, usually in pairs. Its diet is mostly insects and other invertebrates with a small amount of fruit. [5] [6]

Breeding

The western chat-tanager's breeding season is thought to be May to July. Only two nests have been described. They were bulky domes of coarse material like woody stems, vine tendrils, moss, and lichen with a lining of finer material, placed about 1 to 1.5 m (3 to 5 ft) above the ground. One held two eggs; after hatching, both parents provisioned the nestlings. [5]

Vocalization

Both sexes of the western chat-tanager sing, usually at dawn. Their song is described as a buzzy "wee-chee-chee-chee". Their calls include a "chip-chip" and a "tick, tick, tick, tick...". [5]

Status

The IUCN has assessed the western chat-tanager as Vulnerable. It has a small range and its estimated population of 6700 to 13,300 mature individuals is believed to be decreasing. The main threats are logging and conversion of habitat to agriculture. Nest predation, thought to be mainly by black (Rattus rattus) and brown rats (R. norvegicus) as well as feral cats (Felis catus), is significant. [1] It is "fairly numerous locally" in both countries and occurs in some protected areas, which, in Haiti, are only nominally supported. [5]

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References

  1. 1 2 3 BirdLife International (2021). "Western Chat-tanager Calyptophilus tertius". IUCN Red List of Threatened Species . 2021: e.T22729082A190919306. doi: 10.2305/IUCN.UK.2021-3.RLTS.T22729082A190919306.en . Retrieved 8 October 2022.
  2. 1 2 Andrea K. Townsend; Christopher C. Rimmer; Steven C. Latta & Irby J. Lovette (2007). "Ancient differentiation in the single-island avian radiation of endemic Hispaniolan chat-tanagers (Aves: Calyptophilus)". Molecular Ecology . 16 (17): 3634–3642. doi: 10.1111/j.1365-294X.2007.03422.x . PMID   17845436. S2CID   27670555.
  3. 1 2 Gill, F.; Donsker, D.; Rasmussen, P., eds. (August 2022). "Caribbean "tanagers", Wrenthrush, Yellow-breasted Chat". IOC World Bird List. v 12.2. Retrieved August 9, 2022.
  4. ↑ "Check-list of North and Middle American Birds". American Ornithological Society. August 2022. Retrieved August 9, 2022.
  5. 1 2 3 4 5 6 7 Hilty, S. (2020). Western Chat-Tanager (Calyptophilus tertius), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.wectan1.01 retrieved October 8, 2022
  6. ↑ Hilty, S. and E. de Juana (2020). Eastern Chat-Tanager (Calyptophilus frugivorus), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.eactan1.01 retrieved October 8, 2022

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