TimeTree

TimeTree is a free public database developed by S. Blair Hedges and Sudhir Kumar, now at Temple University, for presenting times of divergence in the tree of life.[1][2] The basic concept has been to produce and present a community consensus of the timetree of life [3][4] from published studies, now numbering 3,998, and allow easy access to that information, on the web or mobile device.[2] The database permits searching for average node times between two species or higher taxa and building of a timetree of life [4] for a higher taxa. TimeTree has been used in public education to conceptualize the evolution of life, such as in high school settings.[5] The original development of TimeTree dates to the late 1990s, with initial support from NASA Astrobiology Institute. Since then it has been supported by additional grants from NASA, and by NSF and NIH.

TimeTree
Stable release
v4.0
TypeBioinformatics
LicenseFreeware
Websitewww.timetree.org

Features

TimeTree users can search for the names of two species, such as cat and dog, to obtain the mean and median time estimates for their divergence, in millions of years. The results also show all individual time estimates, from each study, next to a geologic timescale, indicating geologic periods. Separately, a table lists the time estimates, downloadable as a spreadsheet, from each study along with references and links to the abstracts of the original articles. The database also allows search of timetree articles by author name. The entire book Timetree of Life[3] is also presented on the site.

References
  1. Hedges SB, Dudley J, Kumar S (2006). "TimeTree: A public knowledge-base of divergence times among organisms". Bioinformatics. 22 (23): 2971–2. doi:10.1093/bioinformatics/btl505. PMID 17021158.
  2. Kumar S, Hedges, SB (2011). "TimeTree2: species divergence times on the iPhone". Bioinformatics. 27 (14): 2023–4. doi:10.1093/bioinformatics/btr315. PMC 3129528. PMID 21622662.CS1 maint: multiple names: authors list (link)
  3. Hedges SB, Kumar S (2009). The TimeTree of Life. New York: Oxford University Press. ISBN 978-0199535033.
  4. Hedges SB, Marin J, Suleski M, Paymer M & Kumar S (2015). "Tree of Life Reveals Clock-Like Speciation and Diversification". Mol. Biol. Evol. 32 (4): 835–845. arXiv:1412.4312. doi:10.1093/molbev/msv037. PMC 4379413. PMID 25739733.CS1 maint: multiple names: authors list (link)
  5. Metzger KJ (2011). "Helping Students Conceptualize Species Divergence Events using the Online Tool "TimeTree: The Timescale of Life"". The American Biology Teacher. 73 (2): 106–108. doi:10.1525/abt.2011.73.2.9. S2CID 85026876.
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