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Overview

Brief Summary

The Blue-grey Tanager (Thraupis episcopus) is a medium-sized South American songbird of the Tanager family, Thraupidae. Its range is from Mexico south to northeast Bolivia and northern Brazil, all of the Amazon Basin, except the very south. It has been introduced to Lima (Peru). On Trinidad and Tobago, this bird is called Blue Jean. The Blue-grey Tanager is 16–18 cm (6.3-7.1 in) long and weighs 30-40 grams (1.1-1.4 oz.) Adults have a light bluish head and underparts, with darker blue upperparts and a shoulder patch colored a different hue of blue. The bill is short and quite thick. Sexes are similar, but the immature is much duller in plumage. The song is a squeaky twittering, interspersed with tseee and tsuup call notes. Read more...
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Ecology

Habitat

Habitat and Ecology

Systems
  • Terrestrial
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Life History and Behavior

Life Expectancy

Lifespan, longevity, and ageing

Maximum longevity: 9.5 years (wild)
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Thraupis episcopus

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 5
Specimens with Barcodes: 23
Species With Barcodes: 1
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Barcode data: Thraupis episcopus

The following is a representative barcode sequence, the centroid of all available sequences for this species.


There are 6 barcode sequences available from BOLD and GenBank.  Below is a sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.  See the BOLD taxonomy browser for more complete information about this specimen and other sequences.

AAAGACATTGGCACCCTGTACCTAATCTTTGGCGCATGAGCCGGGATAGTAGGTACTGCCCTAAGCCTCCTCATTCGAGCAGAACTAGGCCAACCTGGAGCCCTTCTAGGAGACGACCAAATCTACAACGTAGTCGTCACAGCCCATGCTTTCGTAATAATCTTCTTCATAGTCATGCCAATTATAATCGGAGGGTTTGGAAACTGACTAGTCCCCCTAATAATTGGAGCCCCAGACATAGCATTCCCACGAATAAACAACATAAGCTTCTGACTACTCCCCCCATCCTTCCTTCTCCTCCTAGCATCCTCTACAGTGGAAGCAGGTGCTGGGACAGGATGAACTGTATACCCGCCACTAGCTGGCAACCTAGCCCACGCCGGAGCCTCCGTCGACCTTGCAATCTTCTCCCTACATCTAGCTGGCATCTCTTCAATTCTAGGGGCAATCAACTTCATTACCACAGCCATCAACATAAAACCGCCCGCCCTGTCACAATACCAAACTCCCCTGTTCGTCTGATCCGTCTTAATTACTGCAGTCCTACTGCTCCTGTCCCTACCAGTTCTCGCCGCAGGAATCACAATACTTCTCACAGACCGCAACCTTAACACCACATTCTTTGACCCTGCTGGAGGAGGAGACCCCGTCCTGTACCAACACCTT
-- end --

Download FASTA File
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2012

Assessor/s
BirdLife International

Reviewer/s
Butchart, S. & Symes, A.

Contributor/s

Justification
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be stable, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is extremely large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
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Population

Population
Partners in Flight estimate the total population to number 5,000,000-50,000,000 individuals (A. Panjabi in litt. 2008).

Population Trend
Stable
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Wikipedia

Blue-gray Tanager

The blue-gray tanager (Thraupis episcopus) is a medium-sized South American songbird of the tanager family, Thraupidae. Its range is from Mexico south to northeast Bolivia and northern Brazil, all of the Amazon Basin, except the very south. It has been introduced to Lima (Peru). On Trinidad and Tobago, this bird is called blue jean.

T. e. neosophilus at the Asa Wright Nature Center in Trinidad

Description[edit]

The blue-gray tanager is 16–18 cm (6.3–7.1 in) long and weighs 30–40 g (1.1–1.4 oz). Adults have a light bluish head and underparts, with darker blue upperparts and a shoulder patch colored a different hue of blue. The bill is short and quite thick. Sexes are similar, but the immature is much duller in plumage.

The song is a squeaky twittering, interspersed with tseee and tsuup call notes.

Subspecies[edit]

There are 13–15 commonly recognized subspecies, differing according to the exact hue of blue of the shoulder patch versus the rest of the plumage; they may be greyish, greenish or purplish-blue, with a lavender, dark blue or whitish shoulder patch. For example, T. e. berlepschi (endemic to Tobago) is a brighter and darker blue on the rump and shoulder, T. e. neosophilus with a violet shoulder patch occurs in northern Venezuela, Trinidad, eastern Colombia and the far north of Brazil, T. e. mediana of the southern Amazon basin has a white wing patch, and T. e. cana in the northern Amazon has blue shoulders.

Breeding and Habitat[edit]

The breeding habitat is open woodland, cultivated areas and gardens. The blue-gray tanager lives mainly on fruit, but will also take some nectar and insects.[2] This is a common, restless, noisy and confiding species, usually found in pairs, but sometimes small groups. It thrives around human habitation, and will take some cultivated fruit like papayas (Carica papaya).

One to three, usually two, dark-marked whitish to gray-green eggs are laid in a deep cup nest in a high tree fork or building crevice.[2] Incubation by the female is 14 days with another 17 to fledging. The nest is sometimes parasitised by Molothrus cowbirds.

Two birds studied in the Parque Nacional de La Macarena of Colombia were infected with microfilariae, an undetermined Trypanosoma species, and another blood parasite that could not be identified. Two other birds, examined near Turbo (also in Colombia), did not have blood parasites.[3][4]

Status[edit]

Widespread and common throughout its large range, the blue-gray tanager is evaluated as Least Concern on the IUCN Red List of Threatened Species.[1]

Gallery[edit]

References[edit]

  1. ^ a b BirdLife International (2012). "Thraupis episcopus". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013. 
  2. ^ a b "Blue-Gray Tanager Fact Sheet, Lincoln Park Zoo"
  3. ^ Basto, Natalia; Rodríguez, Oscar A.; Marinkelle, Cornelis J.; Gutierrez, Rafael & Matta, Nubia Estela (2006): Haematozoa in birds from la Macarena National Natural Park (Colombia). Caldasia 28(2): 371-377 [English with Spanish abstract]. PDF fulltext
  4. ^ Londono, Aurora; Pulgarin-R., Paulo C. & Blair, Silva (2007): Blood Parasites in Birds From the Lowlands of Northern Colombia. Caribb. J. Sci. 43(1): 87-93. PDF fulltext

Further reading[edit]

  • ffrench, Richard; O'Neill, John Patton & Eckelberry, Don R. (1991): A guide to the birds of Trinidad and Tobago (2nd edition). Comstock Publishing, Ithaca, N.Y.. ISBN 0-8014-9792-2
  • Hilty, Steven L. (2003): Birds of Venezuela. Christopher Helm, London. ISBN 0-7136-6418-5
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