The bronze-tailed peacock-pheasant (''Polyplectron chalcurum'') is also known as the Sumatran peacock-pheasant. It is an Indonesian

bird Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweigh ...

Description

The bronze-tailed peacock-pheasant is a small, up to 56 cm long, dark brown

pheasant Pheasants ( ) are birds of several genera within the family (biology), family Phasianidae in the order (biology), order Galliformes. Although they can be found all over the world in introduced (and captive) populations, the pheasant genera na ...

with dark grey legs, rather small head and long, narrow tail of sixteen feathers. The tail feathers are chestnut brown with metallic purplish bars near tips. Both sexes are similar. The male has longer tail, two spurs on legs and yellow

iris Iris most often refers to: *Iris (anatomy), part of the eye *Iris (mythology), a Greek goddess * ''Iris'' (plant), a genus of flowering plants * Iris (color), an ambiguous color term Iris or IRIS may also refer to: Arts and media Fictional ent ...

while the unspurred female's is dark brown.

Taxonomy and evolution

The bronze-tailed peacock-pheasant belongs to the family

Phasianidae The Phasianidae are a family (biology), family of heavy, ground-living birds, which includes pheasants, partridges, junglefowl, chickens, Turkey bird, turkeys, Old World quail, and peafowl. The family includes many of the most popular Game (hunti ...

and the genus ''

Polyplectron The peacock-pheasants are a bird genus, ''Polyplectron'', of the family Phasianidae, consisting of eight species. They are colored inconspicuously, relying on heavily on crypsis to avoid detection. When threatened, peacock-pheasants will alter t ...

'', which consists of seven peacock-pheasant

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

. There are two subspecies: * ''P. c. chalcurum'', described by Lesson in 1831, which is known as the southern bronze-tailed peacock-pheasant. * ''P. c. scutulatum'', described by Hoogerwerf in 1941, which is known as the northern bronze-tailed peacock-pheasant.

mtDNA Mitochondrial DNA (mtDNA or mDNA) is the DNA located in mitochondria, cellular organelles within eukaryotic cells that convert chemical energy from food into a form that cells can use, such as adenosine triphosphate (ATP). Mitochondrial DNA ...

cytochrome ''b'' and

D-loop In molecular biology, a displacement loop or D-loop is a DNA structure where the two strands of a double-stranded DNA molecule are separated for a stretch and held apart by a third strand of DNA. An R-loop is similar to a D-loop, but in this cas ...

as well as the

nuclear Nuclear may refer to: Physics Relating to the nucleus of the atom: * Nuclear engineering *Nuclear physics *Nuclear power *Nuclear reactor *Nuclear weapon *Nuclear medicine *Radiation therapy *Nuclear warfare Mathematics *Nuclear space *Nuclear ...

ovomucoid Ovomucoid is a protein found in egg whites. It is a trypsin inhibitor with three protein domains of the Kazal domain family. The homologs from chickens (''Gallus gallus'') and especially turkeys (''Meleagris gallopavo'') are best characterized ...

intron An intron is any nucleotide sequence within a gene that is not expressed or operative in the final RNA product. The word ''intron'' is derived from the term ''intragenic region'', i.e. a region inside a gene."The notion of the cistron .e., gene. ...

G data confirms that this species belongs to a

clade A clade (), also known as a monophyletic group or natural group, is a group of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree. Rather than the English term, ...

together with the

mountain peacock-pheasant The mountain peacock-pheasant (''Polyplectron inopinatum''), also known as Rothschild's peacock-pheasant or mirror pheasant, is a medium-sized, up to 65 cm long, blackish brown pheasant with small ocelli and long graduated tail feathers. Bo ...

, but also the mainland species

Germain's peacock-pheasant Germain's peacock-pheasant (''Polyplectron germaini'') is a pheasant that is endemic to Indochina. The name commemorates the France, French colonial army's veterinary surgeon Louis Rodolphe Germain. Description The bird is a medium-sized, approx ...

and

grey peacock-pheasant The gray peacock-pheasant (''Polyplectron bicalcaratum''), also known as Burmese peacock-pheasant, is a large Asian member of the order (biology), order Galliformes. Taxonomy In 1747 the English naturalist George Edwards (naturalist), George Ed ...

(Kimball ''et al.'' 2001). The molecular data suggests - though not with high confidence - that this species diverged relatively recently from ancestral grey peacock-pheasants. This is quite spurious, since

biogeography Biogeography is the study of the distribution of species and ecosystems in geographic space and through geological time. Organisms and biological communities often vary in a regular fashion along geographic gradients of latitude, elevation, ...

, its peculiarly derived plumage, and the fact that it is an insular mountain endemic indicate it is derived from a comparatively small

founder population In population genetics, the founder effect is the loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population. It was first fully outlined by Ernst Mayr in 1942, using ...

; this would confound molecular analyses. What seems clear is that the present species

evolved Evolution is change in the heritable characteristics of biological populations over successive generations. These characteristics are the expressions of genes, which are passed on from parent to offspring during reproduction. Variation t ...

from mainland Southeast Asian stock, probably during the

Late Pliocene Late may refer to: * LATE, an acronym which could stand for: ** Limbic-predominant age-related TDP-43 encephalopathy, a proposed form of dementia ** Local-authority trading enterprise, a New Zealand business law ** Local average treatment effect, ...

Early Pleistocene The Early Pleistocene is an unofficial sub-epoch in the international geologic timescale in chronostratigraphy, being the earliest division of the Pleistocene Epoch within the ongoing Quaternary Period. It is currently estimated to span the time ...

(3.6-1 myaNote that the

molecular clock The molecular clock is a figurative term for a technique that uses the mutation rate of biomolecules to deduce the time in prehistory when two or more life forms diverged. The biomolecular data used for such calculations are usually nucleoti ...

calibration method used by Kimball ''et al.'' (2001) is now known to be inappropriate, yielding far too low estimates in galliform birds.). The loss of ocelli thus is, contrary to long-held opinion, an

autapomorphy In phylogenetics, an autapomorphy is a distinctive feature, known as a derived trait, that is unique to a given taxon. That is, it is found only in one taxon, but not found in any others or outgroup taxa, not even those most closely related to t ...

, and the southern species of this clade - formerly separated in the genus ''Chalcurus'' - are probably not each other's closest relatives.

Distribution and habitat

Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania between the Indian and Pacific oceans. It consists of over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guine ...

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

, the bronze-tailed peacock-pheasant inhabits to mountain forests of west

Sumatra Sumatra is one of the Sunda Islands of western Indonesia. It is the largest island that is fully within Indonesian territory, as well as the sixth-largest island in the world at 473,481 km2 (182,812 mi.2), not including adjacent i ...

Behaviour

As with other member in the

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

, this elusive bird is shy and very wary. But unlike other

peacock-pheasant The peacock-pheasants are a bird genus, ''Polyplectron'', of the family Phasianidae, consisting of eight species. They are colored inconspicuously, relying on heavily on crypsis to avoid detection. When threatened, peacock-pheasants will alter ...

s, it has no

ocelli A simple eye (sometimes called a pigment pit) refers to a form of eye or an optical arrangement composed of a single lens and without an elaborate retina such as occurs in most vertebrates. In this sense "simple eye" is distinct from a multi-l ...

Conservation

The bronze-tailed peacock-pheasant is evaluated as Least Concern on the

IUCN Red List The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is the world's most comprehensive inventory of the global conservation status of biol ...

of Threatened Species.

References

External links

BirdLife Species Factsheet
{{Taxonbar, from=Q849988

bronze-tailed peacock-pheasant The bronze-tailed peacock-pheasant (''Polyplectron chalcurum'') is also known as the Sumatran peacock-pheasant. It is an Indonesian bird. Description The bronze-tailed peacock-pheasant is a small, up to 56 cm long, dark brown pheasant with ...

Birds of Sumatra

Taxa named by René Lesson