Ciacialaca comune

Identificazione

The plain chachalaca is a medium-sized galliform, around the size of a common pheasant. It measures 48–58 cm (19–23 in) in length, and varies in weight from 468–794 g (16.5–28.0 oz) for males and 439–707 g (15.5–24.9 oz)in females Males are on average larger but because of overlap that isn't diagnostic of sex, and in appearance they are the same. It is long-necked with a small head and bare throat patch which becomes deep red in both sexes during the breeding season. Adults have a greyish head and neck with a dull olive-brown body and wings. The underbelly is pale to ochraceous and the tail is blackish with green gloss and buffy-white tip. The iris is brown and bill is black; orbital skin and the feet are dull grey.<p>O. vetula is a host to the helminth parasite Dispharynx nasuta. Christensen &amp; Pence 1977 find they carry D. nasuta but not Echinuria uncinata, Streptocara crassicauda, or Streptocara incognita.

Tassonomia

The plain chachalaca is related to the West Mexican chachalaca and the white-bellied chachalaca, and both of these were formerly considered a subspecies of the plain chachalaca. Today all major authorities recognize them as separate species. Their ranges slightly overlap in Mexico, but hybrids have not been reported between them. The white-bellied chachalaca may be more closely related to the little chachalaca than the plain chachalaca.<p>There are five recognized subspecies:<p>The isolated population in Costa Rica is assigned to the nominate race of the plain chachalaca, but has also been assigned to the white-bellied chachalaca and may in fact represent a new subspecies of the plain chachalaca - its plumage is closer to this species than the white-bellied.

Nome scientifico

Ortalis vetula

Autorità

(Wagler, 1830)

Ordine

Galliformi

Famiglia

Cracidae

Genere

Ortalis

Areale e habitat

The plain chachalaca is found from Texas, in the Lower Rio Grande, through the eastern coast of Mexico, the Yucatán Peninsula, Belize, northern Guatemala, northern Honduras and just into the north central part of Nicaragua, with a small population on the Nicoya Peninsula of northern Costa Rica. The species has also been introduced and established to San Patricio County in Texas and three islands, Sapelo, Blackbeard and Little St. Simons Island, on the coast of Georgia. In some of its mainland North American introduced range it is considered invasive.: 292 <p>The plain chachalaca occupies a wide range of habitats, including primary forest, secondary forest, forest edge and riverine forest, thorny bush-scrub, and shrubland. It is also found in human modified habitats such as orchards, suburban parks and gardens and croplands. Unlike other cracids, it is able to adapt to the scrubland that arises after the clearing of tropical rainforest. It can be found from sea-level to 1,850 m (6,070 ft)

Migrazione

Resident species

Comportamento

The plain chachalaca is mostly diurnal and is most active in cool mornings and in the evening. It is mostly inactive during the heat of the day. Pairs or family groups roost communally in trees, usually on a branch, often touching, and facing the same way.<p>When it comes to the plain chachalaca's diet, the primary plant species eaten in great volume by them include coyotillo (Karwinskia humboldtiana), Mexican ash (Fraxinus berlandieriana), pigeon-berry (Rivina humilis), and cedar elm (Ulmus crassifolia). The most frequent items of food were discovered to be small fruits and buds of pigeon-berry, followed by anacua and coyotillo berries. Animal matter was found in only four birds and consisted of small snails, caterpillars, and a lace bug, presumably taken incidentally on plant material..mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a{background-size:contain}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a{background-size:contain}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a{background-size:contain}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:#d33}.mw-parser-output .cs1-visible-error{color:#d33}.mw-parser-output .cs1-maint{display:none;color:#2C882D;margin-left:0.3em}.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911F}html.skin-theme-clientpref-night .mw-parser-output .cs1-visible-error,html.skin-theme-clientpref-night .mw-parser-output .cs1-hidden-error{color:#f8a397}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-visible-error,html.skin-theme-clientpref-os .mw-parser-output .cs1-hidden-error{color:#f8a397}html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911F}}W.R., Marion (1976). "Plain chachalaca food habits in south texas". The Auk. 93(2), 376–379.<p>Hunting of the plain chachalaca is restricted to subsistence hunting, for example by the Mayan people in southern Mexico. The plain chachalaca population is 500,000–5,000,000 (2006 IUCN Red List). It is not threatened. However the subspecies from Útila Island, O. v. deschauenseei, has sometimes been listed as extinct, but recent surveys have confirmed that it still survives.<p>Chachalaca are viewed as a game animal in Texas.

Conservazione

Tendenza della popolazione

stable