Tree of life reveals clock-like speciation and diversification
| Autor: | Julie Marin, Madeline Paymer, Sudhir Kumar, S. Blair Hedges, Michael Suleski |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
0106 biological sciences
diversification Genetic Speciation Biodiversity Fast Tracks Tree of life Biology Diversification (marketing strategy) 010603 evolutionary biology 01 natural sciences Evolution Molecular 03 medical and health sciences Phylogenetics Genetic algorithm Genetics timetree Clade Quantitative Biology - Populations and Evolution Molecular Biology Phylogeny Ecology Evolution Behavior and Systematics 030304 developmental biology 0303 health sciences Models Genetic Populations and Evolution (q-bio.PE) Eukaryota Species diversity 15. Life on land speciation tree of life Evolutionary biology FOS: Biological sciences |
| Zdroj: | Molecular Biology and Evolution |
| Popis: | Genomic data are rapidly resolving the tree of living species calibrated to time, the timetree of life, which will provide a framework for research in diverse fields of science. Previous analyses of taxonomically restricted timetrees have found a decline in the rate of diversification in many groups of organisms, often attributed to ecological interactions among species. Here we have synthesized a global timetree of life from 2,274 studies representing 50,632 species and examined the pattern and rate of diversification as well as the timing of speciation. We found that species diversity has been mostly expanding overall and in many smaller groups of species, and that the rate of diversification in eukaryotes has been mostly constant. We also identified, and avoided, potential biases that may have influenced previous analyses of diversification including low levels of taxon sampling, small clade size, and the inclusion of stem branches in clade analyses. We found consistency in time-to-speciation among plants and animals, approximately two million years, as measured by intervals of crown and stem species times. Together, this clock-like change at different levels suggests that speciation and diversification are processes dominated by random events and that adaptive change is largely a separate process. 17 pages, 6 figures, submitted to journal |
| Databáze: | OpenAIRE |
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