You are seeing a free-to-access but limited selection of the activity Altmetric has collected about this research output.
Click here to find out more.
X Demographics
Mendeley readers
Attention Score in Context
| Title |
Long-Term Cycles in the History of Life: Periodic Biodiversity in the Paleobiology Database
|
|---|---|
| Published in |
PLOS ONE, December 2008
|
| DOI | 10.1371/journal.pone.0004044 |
| Pubmed ID | |
| Authors |
Adrian L. Melott |
| Abstract |
Time series analysis of fossil biodiversity of marine invertebrates in the Paleobiology Database (PBDB) shows a significant periodicity at approximately 63 My, in agreement with previous analyses based on the Sepkoski database. I discuss how this result did not appear in a previous analysis of the PBDB. The existence of the 63 My periodicity, despite very different treatment of systematic error in both PBDB and Sepkoski databases strongly argues for consideration of its reality in the fossil record. Cross-spectral analysis of the two datasets finds that a 62 My periodicity coincides in phase by 1.6 My, equivalent to better than the errors in either measurement. Consequently, the two data sets not only contain the same strong periodicity, but its peaks and valleys closely correspond in time. Two other spectral peaks appear in the PBDB analysis, but appear to be artifacts associated with detrending and with the increased interval length. Sampling-standardization procedures implemented by the PBDB collaboration suggest that the signal is not an artifact of sampling bias. Further work should focus on finding the cause of the 62 My periodicity. |
X Demographics
The data shown below were collected from the profile of 1 X user who shared this research output. Click here to find out more about how the information was compiled.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Unknown | 1 | 100% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 1 | 100% |
Mendeley readers
The data shown below were compiled from readership statistics for 63 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United States | 5 | 8% |
| Argentina | 4 | 6% |
| Sweden | 1 | 2% |
| Czechia | 1 | 2% |
| Mexico | 1 | 2% |
| Germany | 1 | 2% |
| Belgium | 1 | 2% |
| United Kingdom | 1 | 2% |
| Unknown | 48 | 76% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Researcher | 20 | 32% |
| Student > Ph. D. Student | 10 | 16% |
| Student > Doctoral Student | 5 | 8% |
| Student > Bachelor | 5 | 8% |
| Professor | 5 | 8% |
| Other | 14 | 22% |
| Unknown | 4 | 6% |
| Readers by discipline | Count | As % |
|---|---|---|
| Earth and Planetary Sciences | 28 | 44% |
| Agricultural and Biological Sciences | 20 | 32% |
| Environmental Science | 4 | 6% |
| Physics and Astronomy | 3 | 5% |
| Chemical Engineering | 1 | 2% |
| Other | 2 | 3% |
| Unknown | 5 | 8% |
Attention Score in Context
This research output has an Altmetric Attention Score of 16. 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 12 August 2020.
All research outputs
#1,915,014
of 22,685,926 outputs
Outputs from PLOS ONE
#24,618
of 193,650 outputs
Outputs of similar age
#8,572
of 168,360 outputs
Outputs of similar age from PLOS ONE
#67
of 443 outputs
Altmetric has tracked 22,685,926 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 91st percentile: it's in the top 10% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 193,650 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 15.0. This one has done well, scoring higher than 87% 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 168,360 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 94% of its contemporaries.
We're also able to compare this research output to 443 others from the same source and published within six weeks on either side of this one. This one has done well, scoring higher than 84% of its contemporaries.