Quetzal Resplandeciente

Identificación

The resplendent quetzal is the largest trogon. It is 36 to 40 cm (14–16 in) long; in the nominate subspecies, the tail streamers measure between 31 cm (12 in) and 100.5 cm (39.6 in), with the median being 75 cm (30 in) for males. The nominate subspecies weighs about 210 g (7.4 oz), while the subspecies costaricensis is slightly smaller than the nominate race, with shorter wings and bills. The tail plumes are shorter and narrower, measuring between 32 cm (13 in) and 86 cm (34 in), with the median being 63 cm (25 in).<p>Resplendent quetzals have a green body (showing iridescence from green-gold to blue-violet) and a red lower breast and belly. Depending on the light, quetzal feathers can shine in a variant of colors: from green, cobalt, lime, and yellow to ultramarine. Their green upper tail coverts hide their tails and are particularly splendid in breeding males, being longer than the rest of the body. Though the quetzal's plumage appears green, they are actually brown due to the pigment melanin. The primary wing coverts are also unusually long and have a fringed appearance. The male has a helmet-like crest. The bill, which is partly covered by green filamentous feathers, is yellow in mature males and grey in females. Their iridescent feathers, which cause them to appear shiny and green like the canopy leaves, are a camouflage adaptation to hide within the canopy during rainy weather. The quetzal's skin is very thin and easily torn, so it has evolved thick plumage to protect its skin. It has large eyes, adapted to see in the dim light of the forest. Their song is an array of full-toned, mellow, slurred notes in plain patterns and is often remarkably melodious: keow, kowee, keow, k'loo, keeloo.

Taxonomía

The resplendent quetzal was first described by Mexican naturalist Pablo de La Llave in 1832. It is one of five species of the genus Pharomachrus, commonly known as quetzals. Quetzal is usually specifically used to refer to the resplendent, but it typically applies to all members of the genera Pharomachrus and Euptilotis. Some scholars label the crested quetzal as a very close relative of the resplendent, and either suggest the crested quetzal to be a subspecies of the resplendent or the two form a superspecies. The quetzal clade is thought to have spread out from where it emerged in the Andes, the resplendent quetzal being the youngest species. The name of the genus, Pharomachrus, refers to the physical characteristics of the bird, with pharos meaning 'mantle' and makros meaning 'long' in Ancient Greek. The word 'quetzal' came from Nahuatl (Aztec), where quetzalli (from the root quetza, meaning 'stand') means 'tall upstanding plume' and then 'quetzal tail feather'; from that, Nahuatl quetzaltotōtl means 'quetzal-feather bird' and thus 'quetzal'.<p>Two subspecies are recognized, P. m. mocinno and P. m. costaricensis, although there is an ongoing debate about whether costaricensis should be recognized as a distinct species. The specific epithet mocinno is a Latinization of the name of the biologist José Mariano M. Mociño, a mentor of his.[note 1]

Nombre científico

Pharomachrus mocinno

Autoridad

de la Llave, 1832

Orden

Trogoniformes

Familia

Trogónidos

Género

Pharomachrus

Distribución y hábitat

This species inhabits amidst lush vegetation, in specially moist rainforests at high elevations (900–3,200 m (3,000–10,500 ft)).[note 2][1] They populate trees that make up the canopy and subcanopy of the rainforest, though they can also be found in ravines and cliffs.[1] It prefers to live in decaying trees, stumps, and abandoned woodpecker hollows.[1] The vivid colors of the quetzal are disguised by the rainforest.[15] The resplendent quetzal can be found from southern Mexico (southernmost Oaxaca and Chiapas) to western Panama (Chiriquí).[18] The ranges of the two subspecies differ: P. m. mocinno is found in southern Mexico, northern El Salvador, and northwestern Nicaragua, Guatemala and Honduras, while P. m. costaricensis is found in Costa Rica and western Panama.[13] The geographical isolation between the two subspecies is caused by the Nicaraguan depression, a 50 km (31 mi) wide, 600 km (370 mi) long bottomland that contains the two largest lakes in Central America, Lake Managua and Lake Nicaragua, and the deficiency of the breeding habitats in regions adjoining to.[18] The quetzal migrates from its breeding areas in the lower montane rainforest to the pre-montane rainforest on the Pacific slopes for three to four months (July–October), after which they move across the continental divide to the Atlantic slopes.[19]<p>Quetzal's abundance in its mating areas is correlated with the total number of fruiting species, although the correlation between quetzal abundance and the number of fruiting Lauraceae species is only marginal.[20]

Migración

Vertical migration

Comportamiento

Resplendent quetzals generally display shy and quiet behaviour to elude predators. In contrast, they are rather vocal during the mating season and their behavior is designated to exhibit and attract mates. Their known predators include the ornate hawk-eagle, golden eagle, and other hawks and owls as adults, along with emerald toucanets, brown jays, long-tailed weasels, squirrels, and kinkajous as nestlings or eggs. The resplendent quetzal plays an important ecological role in the cloud forests, helping disseminate the seeds of at least 32 tree species.<p>Resplendent quetzals are considered specialized fruit-eaters, feeding on 41 to 43 species, although they also feed on insects (primarily wasps, ants, and larvae), frogs, lizards, and snails. Particularly important are the Symplococarpon purpusii and wild avocados, as well as other fruits of the laurel family, which the birds swallow whole before regurgitating the pits, which helps to disperse these trees. Quetzals feed more frequently in the midday hours. The adults eat a more fruit-based diet than the chicks, who eat insects primarily and some fruits. Over fifty percent of the fruit they eat are laurels. Quetzals use the methods of "hovering" and "stalling" in order to selectively pick the fruit from near the tips of the branches.<p>Resplendent quetzals create their nests over 200 feet (60 m) up in the air and court in the air with specific calls. Six specific vocal calls have been recorded: the two-note whistle, gee-gee, wahc-ah-wahc, wec-wec, whistle, coouee, uwac, chatter, and buzzing. The first call is related to male territorial behavior, while the coouee whistle is a mating call. Resplendent quetzals usually live alone when not breeding. They are monogamous territorial breeders, with the size of their territory in Guatemala being 6–10 ha (15–25 acres). They are also seasonal breeders, with the breeding season lasting from March to April in Mexico, May to June in El Salvador, and March to May in Guatemala. When breeding, females lay one to three pale blue eggs with a mean of 38.9 millimetres (1.53 in) x 32.4 millimetres (1.28 in) in a nest placed in a hole which they carve in a rotten tree. Resplendent quetzals tend to lay two clutches per year and are known to have a high rate of nest failure, 67-78%. One of the most important factors when choosing a nest location for the quetzal is that the tree must be in a stage of decomposition and decay. They often reuse their previous sites. The height of nest stubs is 41 feet (10 m) and the nest holes 31 feet (9 m).<p>Both parents take turns at incubating, with their long tail coverts folded forwards over out of the hole, giving them the appearance of a bunch of fern growing out of the hole. The incubation period lasts about 17 to 19 days, during which the male generally incubates the eggs during the day while the female incubates them at night. When the eggs hatch, both parents take care of the young, feeding them entire fruits, such as berries and avocados, as early as the second day. However, chicks are primarily fed insects, lizards, snails and small frogs. It was observed that males generally give more food, namely insects, than females. Nestlings are often neglected and even abandoned by females near the end of the rearing period, leaving it up to the male to continue caring for the offspring until they are ready to survive on their own. During the incubation period, parents land and rotate their heads side to side before entering the nest, a process known as "bowing in". This process ends when the chicks hatch. Young quetzals begin flying after a month, but the distinctive long tail feathers can take three years to develop in males.

Conservación

The population trend varies between subpopulations but is generally decreasing although certain populations may be increasing or are at least stable. It is classified as being near threatened on the IUCN Red List, with an estimated population of 20,000–49,999 individuals. Due to the remote habitat of the quetzal, more monitoring is required to confirm the rate of decline, and depending on the results it could lead to it moving to a higher threat category. In 2001, the quetzal survived only in 11 small, isolated patches of forest. Its biggest threats are habitat loss because of deforestation, forest fragmentation, and agricultural clearing. The quetzal is also sometimes hunted for food and trapped for illegal trading. Cloud forests, the resplendent quetzal's habitat, are one of the most threatened ecosystems in the world, but the species occurs in several protected areas and is a sought-after species for birdwatchers and ecotourists.<p>It was thought that the resplendent quetzal could not be bred or held for a long time in captivity, and was noted for usually dying soon after being captured or caged as a result of assimilation of iron through water ingestion, with this now understood they are now given tannic acid and iron is avoided in their diet. For this reason, it is a traditional symbol of liberty. The national anthem of Guatemala even includes the verse "Antes muerto que esclavo será" (Be rather dead than a slave). However, the scientific discovery about the bird's susceptibility to iron has allowed some zoos, including Miguel Álvarez del Toro Zoo in Tuxtla Gutiérrez, Chiapas, to keep this species. Breeding in captivity was announced in 2004.

Tendencia poblacional

declining