Overview

Comprehensive Description

Description

The Bluethroat is a little bird similar in size to the Sparrow. The male is unmistakable identified by the blue bib edged below with successive black, white and rust colored borders. Some races have the red spot in the centre of the blue bib; others have the white spot in the centre of the blue bib. The size of the bib and the ratio of the blue, rust, white and black colors are quite variable. Females usually have just a blackish crescent with some blue and rusty feathers on the cream throat and breast. Both sexes have the strong white or whitish supercilium and the rusty tail with the broad dark-brown terminal band; the central pair of the tail feathers is plain dark brown. Newly fledged juveniles are freckled and spotted dark brown above and rust with dark-brown color of the tail. In the end of summer juveniles become similar to adults. In autumn plumage birds have a much of rusty tones; males have a bit of blue on the bib; females have more less blue or not have at all. The autumn juveniles and spring (till the middle of the summer) first-year birds are distinguished from the older birds by the wing bar formed by the light buffy borders of the greater coverts.

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Distribution

occurs (regularly, as a native taxon) in multiple nations

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National Distribution

Canada

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Breeding

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Breeding

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Global Range: BREEDING: Eurasia and western Alaska (central Brooks Range west and south to Seward Peninsula), northern Yukon (Johnson and Herter 1989). NON-BREEDING: Asia and Africa.

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Physical Description

Size

Size

Length: 14-16 cm. Weight: 13-26 g. Wing length: 6,8-8,5 cm. Wingspan: 20-24 cm.

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Length: 15 cm

Weight: 21 grams

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Ecology

Habitat

Habitat and Ecology

Systems
  • Terrestrial
  • Freshwater
  • Marine
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Habitat

It inhabits the wet meadows and reed-beds with shrubs; the shrubby river and lake shores; the riparian forests; and the alpine belt with the stones and pygmy birch thickets up to 2500 m. On migration it visits the thickets of tall weeds, groves, forest-belts, gardens and kitchen-gardens.

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Comments: Bushes, undergrowth, and scrub in Arctic tundra, swamps, dense or open forest, and open country (AOU 1983). Low willow scrub. Stays low to ground. BREEDING: Nests in thickets (near water in Arctic willows and scrub birches) on ground in small hollow or in clump of grass near lake edge (Terres 1980). Also in tundra with little cover (Harrison 1978). Nests on ground or low in willow bush (Johnson and Herter 1989).

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Migration

Non-Migrant: No. All populations of this species make significant seasonal migrations.

Locally Migrant: No. No populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).

Locally Migrant: Yes. At least some populations of this species make annual migrations of over 200 km.

Birds from Alaska probably winter in southeastern China; most depart northern Alaska by late August-early September (Johnson and Herter 1989).

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Trophic Strategy

Comments: Eats mostly insects--beetles and flies and their larvae, some aquatic insects; also earthworms small snails, some seeds and berries (Terres 1980). Nestlings are fed mostly insects prior to fledging (Johnson and Herter 1989).

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Life History and Behavior

Behavior

Behaviour

The Bluethroat is common or in places abundant breeding migrant. The nest is built on the ground under the grass or bush from the dry leaves, twigs, grass and moss and is lined with thin grass, rootlets and hair. Nest is built by female only for 3-7 days. Clutches of 3-6 eggs is in mid-April – early July. Only female incubates for 11-15 days. Both parents feed juveniles fledged at 11-14 days old, in late May – end July. Both adults and juveniles on summer eat insects, just in the end of summer birds eat the berries also. Two broods per summer, repeated breeding after losing of first nest is common. Autumn migration starts in August, birds leave the most of breeding areas in mid-September – end October.

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Life Expectancy

Lifespan, longevity, and ageing

Maximum longevity: 11.4 years (wild) Observations: One ringed bird was still alive at 11.4 years of age (http://www.euring.org/data_and_codes/longevity.htm).
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Reproduction

Eggs laid June-July. Clutch size clutch of 4-7 (often 6). Incubation by female, 14-15 days. Young tended by both parents, leave nest at 14 days usually when still unable to fly (Terres 1980, Harrison 1978). Fledging occurs usually by mid-July in Alaska.

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Molecular Biology and Genetics

Molecular Biology

Barcode data: Luscinia svecica

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

 
There are 14 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.
 
BON474-07|NHMO-BC477|Luscinia svecica| ------------------------CACAAAGACATTGGCACCCTTTACCTAATCTTCGGCGCATGAGCCGGGATAGTGGGTACCGCCCTA---AGCCTCCTCATCCGAGCAGAACTAGGCCAACCAGGCGCCCTACTGGGAGAC---GACCAGGTTTACAACGTAGTCGTCACAGCCCATGCTTTCGTAATAATTTTCTTCATAGTCATACCAATCATGATCGGGGGATTTGGAAACTGACTAGTTCCCCTAATA---ATCGGAGCCCCGGACATAGCATTCCCCCGAATAAACAACATAAGCTTCTGACTCCTCCCCCCTTCTTTCCTCCTCCTTCTAGCCTCCTCTACAGTCGAAGCAGGCGTAGGGACAGGATGAACTGTGTACCCTCCCCTAGCAGGTAACCTGGCCCACGCTGGAGCTTCAGTAGACCTA---GCTATCTTCTCCCTTCATCTAGCAGGTATCTCCTCAATCCTAGGCGCCATCAACTTCATTACAACAGCAATCAACATAAAACCCCCTGCCCTCTCACAGTACCAAACCCCCCTATTCGTATGATCCGTCCTAATCACTGCAGTCCTACTACTGCTCTCCCTCCCTGTTCTCGCTGCT---GGCATCACCATGCTGCTAACTGACCGCAACTTAAACACAACCTTCTTTGACCCAGCAGGCGGAGGCGACCCCGTACTCTACCAACACCTATTCTGATTCTTTGGCCACCCAGAAGTATACATCTTAATCCTCCCAGGATTTGGAATTATCTCCCAC------------------------------------------------------------------------------------------------------------------------------- 
-- end --

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Statistics of barcoding coverage: Luscinia svecica

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 14
Species: 23
Species With Barcodes: 1

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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
2009

Assessor/s
BirdLife International

Reviewer/s
Bird, J., Butchart, S.

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.

History
  • 2008
    Least Concern
  • 2004
    Least Concern
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Status in Egypt

Regular passage visitor and winter visitor.

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IUCN

Least Concern.

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National NatureServe Conservation Status

Canada

Rounded National Status Rank: N1B - Critically Imperiled

United States

Rounded National Status Rank: N3B - Vulnerable

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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Population

Population
Rich et al. (2004) estimated the global population to number 2,000,000 individuals. In Europe, the breeding population is estimated to number 4,500,000-7,800,000 breeding pairs, equating to 13,500,000-23,400,000 individuals (BirdLife International 2004).
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Wikipedia

Bluethroat

The Bluethroat (Luscinia svecica) is a small passerine bird that was formerly classed as a member of the thrush family Turdidae, but is now more generally considered to be an Old World flycatcher, Muscicapidae. It, and similar small European species, are often called chats.

Red-spotted race

It is a migratory insectivorous species breeding in wet birch wood or bushy swamp in Europe and Asia with a foothold in western Alaska. It nests in tussocks or low in dense bushes. It winters in north Africa and the Indian Subcontinent.

The Bluethroat is similar in size to the European Robin at 13–14 cm. It is plain brown above except for the distinctive black tail with red side patches. It has a strong white supercilium. The male has a blue bib edged below with successive black, white and rust coloured borders. Some races, such as L. svecica svecica (Red-spotted Bluethroat) of northern Eurasia, have a red spot in the centre of the blue bib.

Others, such as L. svecica cyanecula (White-spotted Bluethroat) of southern and central Europe, have a white spot in the centre of the blue bib. L. svecica magna in Turkey has no central spot.

Females of all races usually have just a blackish crescent on an otherwise cream throat and breast. Newly fledged juveniles are freckled and spotted dark brown above.

Despite the distinctive appearance of the males, recent genetic studies show only limited variation between the forms, and confirm that this is a single species.[1]

The male has a varied and very imitative song [2]. Its call is a typical chat “chack” noise.

References

  1. ^ Zink RM,, RM; Drovetski SV, Questiau S, Fadeev IV, Nesterov EV, Westberg MC, Rohwer S. (2003). "Recent evolutionary history of the bluethroat (Luscinia svecica) across Eurasia.". Molecular Ecology 12 (11): 3069–75. doi:10.1046/j.1365-294X.2003.01981.x. PMID 14629386. 
  2. ^ Metzmacher M. (2008) Les Grillons, muses de la Gorgebleue à miroir blanc (Luscinia svecica cyanecula) ? Parcs & Réserves, 63 : 17-19.
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