Dinosaur family tree gives fresh insight into rapid rise of birds

September 25, 2014
Velociraptor, Cretaceous bird, and chicken. Credit: Jason Brougham

The most comprehensive family tree of meat-eating dinosaurs ever created is enabling scientists to discover key details of how birds evolved from them.

The study has shown that the familiar of – such as feathers, wings and wishbones – all first evolved piecemeal in their dinosaur ancestors over tens of millions of years.

However, once a fully functioning bird body shape was complete, an evolutionary explosion began, causing a rapid increase in the rate at which birds evolved. This led eventually to the thousands of avian species that we know today.

A team of researchers, led by the University of Edinburgh, examined the evolutionary links between and their closest dinosaur relatives. They did this by analysing the anatomical make-up of more than 850 body features in 150 , and used statistical techniques to analyse their findings and assemble a detailed .

Based on their findings from fossil records, researchers say the emergence of birds some 150 million years ago was a gradual process, as some dinosaurs became ever-more bird-like over time. This makes it very difficult to draw a dividing line on the family tree between dinosaurs and birds.

Findings from the study support a controversial theory proposed in the 1940s that the emergence of new body shapes in groups of species could result in a surge in their evolution.

Dr Steve Brusatte, of the University of Edinburgh's School of GeoSciences, who led the study, said: "There was no moment in time when a dinosaur became a bird, and there is no single missing link between them. What we think of as the classic bird skeleton was pieced together gradually over tens of millions of years. Once it came together fully, it unlocked great evolutionary potential that allowed birds to evolve at a super-charged rate."

A new family tree of the meat-eating dinosaurs shows where birds perch among their closest dinosaur relatives. Credit: Stephen Brusatte

Dr Graeme Lloyd, of the University of Oxford, said: "Our study adds to a growing number of works that approach this problem from different angles, but all seem to confirm that the origin of birds was a truly special event in Earth history. It is particularly cool that it is evidence from the fossil record that shows how an oddball offshoot of the dinosaurs paved the way for the spectacular variety of bird species we see today."

The study is published in the journal Current Biology.

Explore further: Shrinking dinosaurs evolved into flying birds (w/ Video)

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hemitite
5 / 5 (4) Sep 25, 2014
"There was no moment in time when a dinosaur became a bird, and there is no single missing link between them. What we think of as the classic bird skeleton was pieced together gradually over tens of millions of years. Once it came together fully, it unlocked great evolutionary potential that allowed birds to evolve at a super-charged rate."

This guy's answer to the chicken/egg conundrum.
JVK
1 / 5 (3) Sep 27, 2014
Estrogen receptor α polymorphism in a species with alternative behavioral phenotypes
http://www.pnas.o...abstract

Thus, our results illustrate a detailed chain of events linking a chromosomal rearrangement to changes in overt social behavior.

Reported as: http://phys.org/n...eld.html

No mutations, no natural selection, no evolution of dinosaurs to birds. Nothing but conserved molecular mechanisms that link RNA-directed DNA methylation from ecological variation to nutrient-dependent pheromone-controlled amino acid substitutions that stabilize DNA in the organized genome of species from microbes to man via conserved molecular mechanisms.

Chicken/egg conundrum resolved 18 years ago: From Fertilization to Adult Sexual Behavior http://www.hawaii...ion.html

Fertilization of the egg leads to RNA-mediated events and morphology and behavior of the chicken.

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