Sporophile noir et bleu

Identification

Adult blue-black grassquits are 10.2 cm (4.0 in) long and weigh 9.3 g (0.33 oz). They have a slender conical black bill. The male is glossy blue-black, with a black tail and wings; the white inner underwing is visible in flight or display. Female and immature birds have brown upperparts and dark-streaked buff underparts.

Taxonomie

The blue-black grassquit was described by the Swedish naturalist Carl Linnaeus in 1766 in the twelfth edition of his Systema Naturae under the binomial name Tanagra jacarina. Linnaeus based his description on the "Jacarni" that was described in 1648 by the German naturalist Georg Marcgrave in his Historia Naturalis Brasiliae. The type locality is eastern Brazil. The specific epithet jacarina is derived from the Tupi language and was used for a type of finch. The blue-black grassquit is now the only species placed in the genus Volatinia and was introduced in 1850 by the German naturalist Ludwig Reichenbach. The genus name is a diminutive of the Latin volatus meaning "flying".<p>Within the tanager family Thraupidae the blue-black grassquit is in the subfamily Tachyphoninae and is a member of a clade that contains the genera Conothraupis and Creurgops.<p>The blue-black grassquit was formerly placed with the buntings in the subfamily Emberizinae rather than with the tanagers in Thraupinae within an expanded family Emberizidae.<p>Three subspecies are recognised:

Nom scientifique

Volatinia jacarina

Autorité

(Linnaeus, 1766)

Ordre

Passériformes

Famille

Tangaridés

Genre

Volatinia

Répartition et habitat

Migration

Resident species

Comportement

Social monogamous, extra-pair fertilizations, intraspecific parasitism, and quasi-parasitism are commonly found. During the breeding season, males defend small territories, about 13,0 - 72,5 m2, dominant males are normally lighter. The male has a jumping display, often performed for long periods, which gives rise to the local name "johnny jump-up". This is accompanied by a persistent wheezing jweeee call, jumping several times in a minute. The extravagant display also has a cost of calling attention of the predator, thus displaying increased nest predation. Predation is the main cause of breeding failure, and predator vocalizations can cause an immune-related reaction to this species. Nests are small cups of rootlets (diameter about 7.5 cm) found in herbaceous vegetation 10–50 cm high, clustered at a landscape, and placed preferably at high complex habitat spots. Nests are built by both sexes.<p>Blue-black grassquits will often form flocks when not breeding. They eat seeds, mostly on the ground.

Conservation

Tendance de la population

rising