Bird-of-paradise evolution, new study


This 2015 video says about itself:

Bird Of Paradise: Appearances COUNT! | Animal Attraction | BBC Earth

In the tropical forests of New Guinea, one male is dedicated to making an unforgettable first impression. Taken from Animal Attraction.

From the University of Vienna in Austria:

The evolution of bird-of-paradise sex chromosomes revealed

April 1, 2019

Birds-of-paradise are a group of songbird species, and are known for their magnificent male plumage and bewildering sexual display. Now, an international collaborative work involving Dept. of Molecular Evolution and Development of University of Vienna, Zhejiang University of China, and Swedish Museum of Natural History analyzed all together 11 songbird species genomes, including those of five bird-of-paradise species, and reconstructed the evolutionary history of their sex chromosomes.

Birds have an opposite type of sex chromosomes to that of mammals. That is, females have one Z chromosome and one female-specific W chromosome, while males have two Z chromosomes. The W chromosome is much smaller and gene-poor, similar to the Y chromosome of human. By sequencing the female songbird genomes, the researchers now uncovered the details of how Z and W chromosomes had become separated for their evolutionary trajectories, and which factors dictate the fates of the genes on the W chromosome.

Junk DNA facilitated the separation of sex chromosomes

Sex chromosomes are not supposed to have genetic exchange with each other for most of the regions. That is, they evolve along separate evolutionary trajectories; so that sex-determining genes will not be recombined from one sex chromosome to the other, then appear in the opposite sex. The researchers showed that such suppression of recombination has occurred at four time points between the songbird sex chromosomes. This has reshaped four consecutive sex-linked regions to form a gradient of time-associated divergence pattern, termed ‘evolutionary strata’. Despite the dramatically diverse phenotypes of all extant 5,000 songbird species, all of them seem to share the same evolutionary history of these recombination suppression events. What has caught the attention of the researchers is, one family of repetitive elements (called ‘CR1 transposon’), presumably non-functional DNA sequences have massively accumulated at a mutation hotspot located between the two neighboring evolutionary strata. This brought the hypotheses that junk DNAs may have triggered the loss of recombination between sex chromosomes, and subjected them for separate evolution paths.

Only dosage-sensitive genes survived on the W chromosome

Once recombination is lost on the W chromosome (Z chromosomes can still recombine only in males), genes cannot resist the invasion of deleterious mutations, as normally they can be effectively purged by recombination. This is the price of sex that the sex chromosome (either the human Y or the bird W) has to pay. Nowadays only a handful of genes are retained functional on the songbird W chromosomes due to such long-term genetic erosion. The researchers found the retained genes tend to be more broadly or highly expressed than any other genes that have become lost in non-avian species, where both sets of genes still exist. This indicates that the retained genes have more important functions than others, and losing them, even when the Z-linked gene still exists in female, is too costly for the species to bear a reduced dosage.

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Female birds-of-paradise, what do they love?


This video says about itself:

Bird Of Paradise Courtship Spectacle | Planet Earth | BBC Earth

Deep in the forests of New Guinea there is a rich variety of life, each more bizarre than the last. One such spectacle is the male Bird of Paradise who appears to go to extraordinary lengths to attract a mate.

From Cornell University in the USA:

Among birds-of-paradise, good looks are not enough to win a mate

November 20, 2018

Male birds-of-paradise are justly world famous for their wildly extravagant feather ornaments, complex calls, and shape-shifting dance moves — all evolved to attract a mate. New research published in the open-access journal PLOS Biology suggests for the first time that female preferences drive the evolution of physical and behavioral trait combinations that may also be tied to where the male does his courting: on the ground or up in the trees. There are 40 known species of birds-of-paradise, most found in New Guinea and northern Australia.

Study lead author Russell Ligon, a postdoctoral researcher at the Cornell Lab of Ornithology, suggests females are evaluating not only how great the male looks but, simultaneously, how well he sings and dances. Female preferences for certain combinations of traits result in what the researchers call a “courtship phenotype” — bundled traits determined by both genetics and environment.

Study authors examined 961 video clips and 176 audio clips in the Cornell Lab’s Macaulay Library archive as well as 393 museum specimens from the American Museum of Natural History in New York City. They conclude that certain behaviors and traits are correlated:

  • As the number of colors on a male increase so do the number of different sounds he makes.
  • The most elaborate dancers also have a large repertoire of sounds.
  • Males that display in a group (called a lek) have more colors to stand out better visually amid the competition.

Because female birds-of-paradise judge male quality based on a combination of characteristics, the study suggests that males may be able to evolve new features while still maintaining their overall attractiveness to females — there’s room to “experiment” in this unique ecological niche where there are few predators to quash exuberant courtship displays.

The researchers found that where a bird-of-paradise puts on his courtship display also makes a difference.

“Species that display on the ground have more dance moves than those displaying in the treetops or the forest understory,” explains Edwin Scholes, study co-author and leader of the Cornell Lab’s Bird-of-Paradise Project. On the dark forest floor, males may need to up their game to get female attention.”

Above the canopy, where there is less interference from trees and shrubs, males sang more complex notes, where they are more likely to be heard. But their dances were less elaborate — perhaps a nod to the risks of cutting footloose on a wobbly branch.

New Guinea, a paradise for birds


This video from the Cornell Lab of Ornithology in the USA says about itself:

7 October 2018

The Birds-of-Paradise Project presents “Tanah Papua: A Paradise for Birds”.

Indonesia’s provinces of Papua and West Papua on the island of New Guinea make up the Land of Papua, or “Tanah Papua” in the Indonesian language. This region supports one of the only remaining large tropical forests in the world and is home to nearly half of Indonesia’s biodiversity. Over 600 species of birds are found in Papua, including 27 bird-of-paradise species, many of which live nowhere else on earth. Global interest in Papua’s birdlife is leading to increased opportunity for wildlife tourism and bringing newfound economic benefits to local communities. Sustainable development is not only important for the future of Papua’s forests and people, but also for the world.

The Cornell Lab’s Birds-of-Paradise Project is working with the Governments of Papua and West Papua and other international partners to further science, engagement and conservation of the region’s biodiversity with a focus on the birds-of-paradise.

New bird-of-paradise species discovered?


The raised cape of the newly discovered western male (left) is crescent shaped and unlike the oval shape of the widespread Superb Bird-of-Paradise (right) found throughout most of New Guinea. Left image © Tim Laman ML 62126951. Right image © Ed Scholes ML 458003

The raised cape of the newly discovered western male bird-of-paradise (left) is crescent shaped and unlike the oval shape of the widespread Superb Bird-of-Paradise (right) found throughout most of New Guinea. Left image © Tim Laman ML 62126951. Right image © Ed Scholes ML 458003.

From the Cornell Lab of Ornithology in the USA:

Dance Moves Support Evidence for New Bird-of-Paradise Species

30 Jun 2017

The Superb Bird-of-Paradise—the shape-shifting black bird of central New Guinea that woos its mate with an iridescent blue “smiley-face” dance—has an equally superb cousin in the isolated mountains of Indonesia’s Bird’s Head Peninsula in the island’s far west. Scientist Ed Scholes and photographer Tim Laman, with the Cornell Lab of Ornithology’s Birds-of-Paradise Project, have now visually documented the distinct differences between the western population in the Arfak Mountains and the more common form found elsewhere on the island. Both believe the western form should be considered a new species.

“The courtship dance is different. The vocalizations are different. Even the shape of the displaying male is different,” says Scholes. “For centuries, people thought the Superb Bird-of-Paradise in the mountains of the Bird’s Head region was a little different from the other populations throughout the rest of New Guinea, but no one had ever documented its display in the 200 plus years this bird has been known to occur there.”

“Even after many trips to the region, we’d never seen the Arfak birds do their courtship display,” says Birds-of-Paradise Project co-leader Tim Laman. “When we finally located a display site and saw a male open his cape for the first time, what we saw was a complete surprise!”

When expanded for courtship display, the western male’s raised cape creates a completely different appearance—crescent-shaped with pointed tips rather than the oval shape of the widespread form of the species. The way the western male dances for the female is also is distinctive, being smooth instead of bouncy.

Scholes and Laman have been studying and filming birds-of-paradise behavior in the Arfak Mountains for the past 13 years. They first uncovered this population’s unique courtship behaviors in June 2016 and returned again this year to gather additional documentation for a forthcoming scientific paper.

A recently published independent genetic study confirms the visual and behavioral evidence collected by Scholes and Laman. A team of researchers from Sweden and Australia used DNA samples from museum specimens to examine the evolutionary relationships among Superb Bird-of-Paradise forms throughout New Guinea. Their research, published online in the Zoological Journal of the Linnean Society, found that the western form is more genetically distinct from the widespread form than previously thought. They, too, say the western population should be recognized as a full species called Lophorina neidda inopinata.

“The timing of this DNA-based study is perfect,” said Ed Scholes, “because it is great to have our field observations supported by solid genetic evidence. We really appreciate this in-depth study of the evolutionary relationships among the different forms of Superb Bird-of-Paradise.”

The Cornell Lab’s Birds-of-Paradise Project (birdsofparadiseproject.org)) is a research and education initiative to document, interpret, and protect the birds-of-paradise, their native environments, and the other biodiversity of the New Guinea region—one of the largest remaining tropical wildernesses on the planet.

Bird of paradise courtship video


This video says about itself:

Bird Of Paradise Courtship Spectacle – Planet Earth – BBC Earth

27 March 2017

Deep in the forests of New Guinea there is a rich variety of life, each more bizarre than the last. One such spectacle is the male Bird of Paradise which appears to go to extraordinary lengths to attract a mate.

Lorikeets, originally from New Guinea?


This video from Australia says about itself:

Lorikeet Feeding Frenzy

22 November 2012

The feeding of the Rainbow Lorikeets at Bungalow Bay Koala Village which is on the North-east side of Magnetic island, just off the coast of Townsville, Queensland.

From Molecular Phylogenetics and Evolution, Volume 90, September 2015, Pages 34–48:

Molecular phylogenetics suggests a New Guinean origin and frequent episodes of founder-event speciation in the nectarivorous lories and lorikeets (Aves: Psittaciformes)

Highlights

We report the first DNA sequence-based phylogeny of parrots known as lories and lorikeets.

The group is inferred to have originated within the last 10 million years in New Guinea.

Dispersal and founder-event speciation have been important in their diversification.

Dispersal appears to have been primarily ‘downstream’ from New Guinea and Australia.

Some genus level changes to the group’s systematics are recommended.

Abstract

The lories and lorikeets (Aves: Loriinae: Loriini) are a readily recognizable, discrete group of nectarivorous parrots confined to the Indo-Pacific region between Wallace’s Line and the Pitcairn Island group in the central-east Pacific Ocean. We present the first phylogenetic analysis of all currently recognized genera in the group using two mitochondrial and five nuclear loci.

Our analyses suggest a New Guinean origin for the group at about 10 million years ago (95% HPD 4.8–14.8) but this origin must be interpreted within the context of that island’s complicated, recent geological history. That is, the origin and early diversification of the group may have taken place as New Guinea’s Central Cordillera arose and the final constituent terranes that form present-day New Guinea were accreted. The latter activity may have promoted dispersal as a key element in the group’s history.

We have detected several instances of dispersal out of New Guinea that we argue constitute instances of founder-event speciation. Some phenotypically cohesive genera are affirmed as monophyletic but other genera are clearly in need of taxonomic dismantlement and reclassification. We recognize Parvipsitta Mathews, 1916 for two species usually placed in Glossopsitta and we advocate transfer of Chalcopsitta cardinalis into Pseudeos Peters, 1935. Other non-monophyletic genera such as Charmosyna, Psitteuteles and, probably, Trichoglossus, require improved taxon sampling and further phylogenetic analysis before their systematics can be resolved. Cursory examination of trait mapping across the group suggests that many traits are ancestral and of little use in determining genus-level systematics.

Lorikeet and lori family tree, according to new research

New birds-of paradise video


This video from the USA says about itself:

Dec 21, 2012

This inspiring footage of the Birds-of-Paradise project celebrates the Cornell Lab of Ornithology‘s long-standing tradition of documenting and sharing information about the natural world. Thanks to you, that tradition continues. We hope you’ll keep watching, listening, and exploring with us to improve the understanding and protection of birds and biodiversity around the globe. Filmed and photographed by Tim Laman. To make a gift to the Cornell Lab visit birds.cornell.edu/support