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| Title |
A new time tree reveals Earth history’s imprint on the evolution of modern birds
|
|---|---|
| Published in |
Science Advances, December 2015
|
| DOI | 10.1126/sciadv.1501005 |
| Pubmed ID | |
| Authors |
Santiago Claramunt, Joel Cracraft |
| Abstract |
Determining the timing of diversification of modern birds has been difficult. We combined DNA sequences of clock-like genes for most avian families with 130 fossil birds to generate a new time tree for Neornithes and investigated their biogeographic and diversification dynamics. We found that the most recent common ancestor of modern birds inhabited South America around 95 million years ago, but it was not until the Cretaceous-Paleogene transition (66 million years ago) that Neornithes began to diversify rapidly around the world. Birds used two main dispersion routes: reaching the Old World through North America, and reaching Australia and Zealandia through Antarctica. Net diversification rates increased during periods of global cooling, suggesting that fragmentation of tropical biomes stimulated speciation. Thus, we found pervasive evidence that avian evolution has been influenced by plate tectonics and environmental change, two basic features of Earth's dynamics. |
X Demographics
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Japan | 56 | 11% |
| United States | 23 | 4% |
| Germany | 4 | <1% |
| Canada | 3 | <1% |
| United Kingdom | 3 | <1% |
| Colombia | 3 | <1% |
| Ecuador | 3 | <1% |
| Spain | 3 | <1% |
| Australia | 3 | <1% |
| Other | 18 | 3% |
| Unknown | 397 | 77% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 459 | 89% |
| Scientists | 48 | 9% |
| Science communicators (journalists, bloggers, editors) | 8 | 2% |
| Practitioners (doctors, other healthcare professionals) | 1 | <1% |
Mendeley readers
The data shown below were compiled from readership statistics for 450 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United States | 5 | 1% |
| Brazil | 3 | <1% |
| Germany | 2 | <1% |
| Canada | 2 | <1% |
| Czechia | 2 | <1% |
| Portugal | 1 | <1% |
| United Kingdom | 1 | <1% |
| Norway | 1 | <1% |
| Argentina | 1 | <1% |
| Other | 3 | <1% |
| Unknown | 429 | 95% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Researcher | 78 | 17% |
| Student > Ph. D. Student | 74 | 16% |
| Student > Bachelor | 60 | 13% |
| Student > Master | 58 | 13% |
| Professor | 23 | 5% |
| Other | 78 | 17% |
| Unknown | 79 | 18% |
| Readers by discipline | Count | As % |
|---|---|---|
| Agricultural and Biological Sciences | 222 | 49% |
| Biochemistry, Genetics and Molecular Biology | 39 | 9% |
| Environmental Science | 30 | 7% |
| Earth and Planetary Sciences | 30 | 7% |
| Nursing and Health Professions | 4 | <1% |
| Other | 38 | 8% |
| Unknown | 87 | 19% |
Attention Score in Context
This research output has an Altmetric Attention Score of 586. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 14 June 2024.
All research outputs
#41,826
of 26,314,972 outputs
Outputs from Science Advances
#549
of 13,007 outputs
Outputs of similar age
#451
of 398,756 outputs
Outputs of similar age from Science Advances
#4
of 82 outputs
Altmetric has tracked 26,314,972 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 99th percentile: it's in the top 5% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 13,007 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 119.0. This one has done particularly well, scoring higher than 95% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 398,756 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 99% of its contemporaries.
We're also able to compare this research output to 82 others from the same source and published within six weeks on either side of this one. This one has done particularly well, scoring higher than 95% of its contemporaries.