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Exhaustive Family Tree for Birds Shows Recent, Rapid Diversification

By Guest PostNovember 9, 2012Natureanalysis, arne mooers, avian diversity, basic hypotheses, behavioral innovation, biodiversity expert, bird species, birds, bumblebees, canada, diversification rate, dna data, earth, eurasia, evolution, evolutionary history, extinction, family tree, fossil, g h thomas, geographic context, geographic space, geographical information, global phylogenies, global picture, habitats, islands, j b joy, k hartmann, life, mainlands, north american, simon fraser university, south america, Space, tasmania, time, tropical species, tunafish, walter jetz, western hemisphere, yale, zeitgeist

A Yale-led scientific team has produced the most comprehensive family tree for birds to date, connecting all living bird species — nearly 10,000 in total — and revealing surprising new details about their evolutionary history and its geographic context.

Analysis of the family tree shows when and where birds diversified — and that birds’ diversification rate has increased over the last 50 million years, challenging the conventional wisdom of biodiversity experts.

“It’s the first time that we have — for such a large group of species and with such a high degree of confidence — the full global picture of diversification in time and space,” said biologist Walter Jetz of Yale, lead author of the team’s research paper, published Oct. 31 online in the journal Nature. (more…)

Yale Study Reveals New Family Tree for Ray-Finned Fish

By Guest PostAugust 7, 2012Natureage of fishes, alex dornburg, bass, bonefishes, bonytongue fish, devonian period, dinosaurs, eels, evolutionary birthday, family tree, fishes, fossil record, freshwater, genetic analysis, kristen l kuhn, lineages of fish, mammals, ray finned fish, ron i eytan, salmon, second age, teleost fish, teleost lineages, teleosts, thomas near, tropical, tuna, yale university

The most common lineages of fish found today in oceans, lakes, and rivers evolved about the same time as mammals and birds, a new Yale University-led study shows.

The comparative genetic analysis of more than 200 fish species, reported the week of Aug. 6 in the Proceedings of the National Academy of Sciences, gave an earlier than expected evolutionary birthday to well-known teleost — or ray-finned — fish such as salmon, bass, or tuna.

The analysis also shows that the very earliest lineages of living teleost fish were eels and bonefishes, not tropical freshwater bonytongue fish as some scientists had proposed. (more…)

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Exhaustive Family Tree for Birds Shows Recent, Rapid Diversification

Yale Study Reveals New Family Tree for Ray-Finned Fish