Tortora orientale

Identificazione

The Oriental dove is very similar in plumage to the Turtle dove. It is a little larger than that species, particularly in the case of orientalis, about the same size as a collared dove. It shares the black and white striped patch on the side of its neck made of silver-tipped feathers, but the breast is less pink, and the orange-brown wing feathers of the turtle dove are replaced with a browner hue, and darker centres giving a scaly appearance. The tail is wedge shaped, like the turtle dove. The flight is more relaxed and direct than that of its relative. Additionally, the turtle-dove has a bare patch of skin around its eyes, which the oriental dove lacks.<p>The calls are different from the purring of the European turtle dove. It is a four-syllable her-her-oo-oo. There are significant call differences within the populations as well.

Tassonomia

The genus name Streptopelia is from Ancient Greek streptos, "collar" and peleia, "dove". The specific orientalis is Latin for "eastern", in this case referring to the type locality, China.<p>The species has a wide distribution with geographical variation in plumage that has led to at least six subspecies being designated. The distributions of many are not disjunct and gradation exists except in some island populations. Some of the populations of Streptopelia turtur that occur on the eastern edge can be very similar in appearance to S. orientalis and in the past the two species have been lumped together.<p>The Oriental turtle dove has two distinct migratory northern subspecies, S. o. orientalis in the central Siberian taiga, and S. o. meena in the open woodlands of Central Asia. The differences in the tail patterns of the subspecies S. o. orientalis and S. o. meena help separate identification in their wintering grounds. The nominate form is described as having a grey tip to the tail and more black in the outer web of the outer tail feathers, while meena has a white tip to its tail like the European turtle dove and less black in the outer web of the outer tail feathers. However, these are not consistent differences: both forms can have white or grey tail-bands and orientalis can have little black in the outer webs of the outer tail feathers.

Nome scientifico

Streptopelia orientalis

Autorità

(Latham, 1790)

Ordine

Columbiformi

Famiglia

Columbidae

Genere

Streptopelia

Areale e habitat

The habitat varies, but the Oriental turtle dove breeds in well-wooded but open habitats and winters in more open habitats but usually with good tree cover.<p>The westernmost race, meena, breeds in the Western Palearctic region. The southernmost populations are resident, but most other birds migrate south to winter in India, the Maldives, and southern Japan. They disperse widely and are known from islands such as the Lakshadweep in winter. S. o. orientalis occurs as a rarity in western Alaska and British Columbia. It is also a vagrant to northern and western Europe and occurrences in Britain tend to gather much attention from twitchers.

Migrazione

Complete migrants

Comportamento

The summer breeding season in the temperate zone can be protracted. In southern India, the breeding season is in winter. In display, the male flaps its wing noisily and shoots up before gliding down with outspread tail. Nests take about two days to build with the male gathering material and the female placing it. The nest is more substantial than in some other doves and is placed at mid-canopy height. In Japan, nests built at a greater height tended to be prone to predation. Males were found to incubate in the day and the female by night. Two white eggs, as for all pigeons and doves, are laid in a twig nest in a tree. Incubation begins immediately after the first egg is laid. The eggs hatch in 15 to 16 days and the chicks take about 15 to 17 days to fledge (in Japan). Both parents feed the altricial chicks with crop milk. Multiple broods may be raised and nests built by the pair or by others may be reused. Nest reuse may possibly increase the chances of predation. In Japan the principal predators of nestlings and eggs were crows and magpies and to a lesser extent cats and snakes.<p>The Oriental turtle dove is granivorous, and feeds on the seeds of hemp, sunflower, wheat, millet and amaranth. It also consumes gastropods. They forage on the ground.<p>Nests in Japan that have accumulated faeces have been found to host a number of flies belonging to the families Sphaeroceridae, Sepsidae, and Stratiomyidae.<p>Subcutaneous mites of the species Hypodectes propus have been recorded in Japan. Deaths of a number of birds due to avian pox virus have been recorded in South Korea.<p>On Hongdo Island, Korea, migratory doves were found to carry seeds of the exotic Achyranthes japonica attached to their plumage.

Conservazione

Tendenza della popolazione

stable