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28 noviembre 2014 5 28 /11 /noviembre /2014 21:31
Like all bowerbirds, the satin bowerbird shows highly complex courtship behaviour. Mate choice in satin bowerbirds has been studied in detail by a group of researchers at the University of Maryland, College Park.[6]
Like all bowerbirds, the satin bowerbird shows highly complex courtship behaviour. Mate choice in satin bowerbirds has been studied in detail by a group of researchers at the University of Maryland, College Park.[6]

The Great Bowerbird is common in northern Australia. Here we see several a male bird at a bower which it has constructed to attract females.

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Para las aves de emparrado es dificil obtener la atención de una hembra. Estas aves pasan la mayor parte de su tiempo construyendo y dándole mantenimiento a una compleja e intrincada estructura (un enrejado) que usan para atraer a las hembras.Dos muros de ramas se extienden de este a oeste y un patio lleno de piedras, palos, conchas y huesos de norte a sur.

Los investigadores descubrieron que los machos de Ptilonorhynchus nuchalis organizan la estructura de tal forma que desde la perspectiva de la hembra todos los objetos –las ramas que forman el sendero (casi nupcial)– parezcan ser del mismo tamaño por la perspectiva. El estudio fue dirigido por la Dra Laura Kelley, de la Universidad de Deakin:

“Una posible explicación es que la ilusión visual hace que este despliegue de cortejo se vea más pequeño, tal que cualquiera de los objetos en el patio parecen ser más grandes de lo que en realidad son, y de esta forma el macho es interpretado como una mejor pareja. Los machos que producen patrones más semejantes –requeridos para una ilusión de alta calidad– obtuvieron más parejas que los que hicieron patrones menos semejantes. O el patrón requerido para crear la perspectiva forzada es un indicador de la cualidad del macho [que atrae a las hembras]… o la ilusión sostiene la atención de las hembras por más tiempo, lo que hace que el apareamiento sea más probable”.

Sin duda la sexualidad de las aves de emparrado es fascinante –aunque un tanto grotesca.

Male Great Bowerbird capture by sensor camera courting a female who came to his bower.

Great Bowerbird (Ptilonorhynchus nuchalis) (Ptilonorhynchidae: Bowerbirds, Catbirds)

The Great Bowerbird is common dry woodland, parks, even gardens in northern Australia. Here we see several a male bird at a bower which it has constructed to attract females. Note the 'jewels' which it has collected and proceeds to show off as part of the display. These include plastic caps and white marble chips, probably from a nearby graveyard. Also see footage of the Satin bowerbird at vimeo.com/70684038 which make a similar bower but decorates it with blue things.

Satin Bowerbirds in the Australian National Botanic Gardens, filmed 18th November 2010. Uploaded for my blog: http://lunchtime-adventures.blogspot.com

Two males displaying to a female masked bowerbird, Sericulus aureus, illustrated by John Gould (1804–1881)
Two males displaying to a female masked bowerbird, Sericulus aureus, illustrated by John Gould (1804–1881)

Bowerbirds as a group have the longest life expectancy of any passerine family with significant banding studies. The two most studied species, the green catbird and satin bowerbird, have life expectancies of around eight to ten years[9] and one satin bowerbird has been known to live for twenty-six years.[10] For comparison, the common raven, the heaviest passerine species with significant banding records, has not been known to live longer than 21 years.[11]

The most notable characteristic of bowerbirds is their extraordinarily complex courtship and mating behaviour, where males build a bower to attract mates. There are two main types of bowers. One clade of bowerbirds build so-called maypole bowers, which are constructed by placing sticks around a sapling; in some species, these bowers have a hut-like roof. The other major bowerbuilding clade builds an avenue type-bower made of two walls of vertically placed sticks. In and around the bower, the male places a variety of brightly colored objects he has collected. These objects — usually different among each species — may include hundreds of shells, leaves, flowers, feathers, stones, berries, and even discarded plastic items, coins, nails, rifle shells, or pieces of glass. The males spend hours arranging this collection. Bowers within a species share a general form but do show significant variation, and the collection of objects reflects the biases of males of each species and its ability to procure items from the habitat, often stealing them from neighboring bowers. Several studies of different species have shown that colors of decorations males use on their bowers match the preferences of females.

 

Though bowerbirds have traditionally been regarded as closely related to the birds of paradise, recent molecular studies suggest that while both families are part of the great corvid radiation that took place in or near Australia-New Guinea, the bowerbirds are more distant from the birds of paradise than was once thought. Charles Sibley's DNA-DNA hybridization studies placed them close to the lyrebirds;[20] however, anatomical evidence appears to contradict this placement[citation needed], and the true relationship remains unclear.

Genus Ailuroedus

Genus Scenopooetes

Genus Archboldia

Genus Amblyornis

Genus Prionodura

Genus Sericulus

Genus Ptilonorhynchus

Genus Chlamydera

Note that the gray catbird (Dumetella carolinensis) and black catbird (Melanoptila glabrirostris) from the Americas and the Abyssinian catbird (Parophasma galinieri) from Africa are unrelated birds that belong to different families.

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  • : Ecología y sostenibilidad socioambiental, énfasis en conservación de ríos y ecosistemas, denuncia de impacto de megaproyectos. Todo esto es indesligable de la política y por ello esta también se observa. Ecology, social and environmental sustainability, emphasis on conservation of rivers and ecosystems, denounces impact of megaprojects. All this is inseparable from politics, for it, the politics is also evaluated.
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  • Biólogo desde hace más de treinta años, desde la época en que aún los biólogos no eran empleados de los abogados ambientalistas. Actualmente preocupado …alarmado en realidad, por el LESIVO TRATADO DE(DES)INTEGRACIÓN ENERGÉTICA CON BRASIL
  • Biólogo desde hace más de treinta años, desde la época en que aún los biólogos no eran empleados de los abogados ambientalistas. Actualmente preocupado …alarmado en realidad, por el LESIVO TRATADO DE(DES)INTEGRACIÓN ENERGÉTICA CON BRASIL

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