The DOI matches its Crossref record; 33 of the 33 references it cites were found in a registry or an index.
Triassic origin and early radiation of multicellular volvocine algae
Open accessAbstract
Evolutionary transitions in individuality (ETIs) underlie the watershed events in the history of life on Earth, including the origins of cells, eukaryotes, plants, animals, and fungi. Each of these events constitutes an increase in the level of complexity, as groups of individuals become individuals in their own right. Among the best-studied ETIs is the origin of multicellularity in the green alga Volvox, a model system for the evolution of multicellularity and cellular differentiation. Since its divergence from unicellular ancestors,Volvox has evolved into a highly integrated multicellular organism with cellular specialization, a complex developmental program, and a high degree of coordination among cells. Remarkably, all of these changes were previously thought to have occurred in the last 50–75 million years. Here we estimate divergence times using a multigene data set with multiple fossil calibrations and use these estimates to infer the times of developmental changes relevant to the evolution of multicellularity. Our results show that Volvox diverged from unicellular ancestors at least 200 million years ago. Two key innovations resulting from an early cycle of cooperation, conflict and conflict mediation led to a rapid integration and radiation of multicellular forms in this group. This is the only ETI for which a detailed timeline has been established, but multilevel selection theory predicts that similar changes must have occurred during other ETIs.
Overview
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Citations
Cites
MrBayes 3: Bayesian phylogenetic inference under mixed models
Ronquist, F., & Huelsenbeck, J. P. (2003) · Bioinformatics · doi:10.1093/bioinformatics/btg180 · Cited by 29,077
THE MAJOR TRANSITIONS OF EVOLUTION
Leigh, E. G. (1995) · Evolution · doi:10.1111/j.1558-5646.1995.tb04464.x · Cited by 3,410
Sanderson, M. J. (2002) · Molecular Biology and Evolution · doi:10.1093/oxfordjournals.molbev.a003974 · Cited by 1,977
Sanderson, M. J. (2003) · Bioinformatics · doi:10.1093/bioinformatics/19.2.301 · Cited by 1,906
The origin and early evolution of plants on land
Kenrick, P., & Crane, P. R. (1997) · Nature · doi:10.1038/37918 · Cited by 1,466
The Evolution of Individuality
Buss, L. W. (1988) · Princeton University Press eBooks · doi:10.1515/9781400858712 · Cited by 1,368
Estimating the rate of evolution of the rate of molecular evolution
Thorne, J. L., Kishino, H., & Painter, I. S. (1998) · Molecular Biology and Evolution · doi:10.1093/oxfordjournals.molbev.a025892 · Cited by 1,317
A nonparametric approach to estimating divergence times in the absence of rate constancy.
Sanderson, M. J. (1997) · Molecular Biology and Evolution · doi:10.1093/oxfordjournals.molbev.a025731 · Cited by 1,156 · cited 1×
“We estimated divergence times using Langley–Fitch (LF), penalized likelihood with an additive penalty (PL) (14), and nonparametric rate smoothing (NPRS) (15) algorithms in r8s (16) and Bayesian inference in MultiDivTime (17).”
MethodA Molecular Timeline for the Origin of Photosynthetic Eukaryotes
Yoon, H. S., Hackett, J. D., Ciniglia, C., Pinto, G., & Bhattacharya, D. (2004) · Molecular Biology and Evolution · doi:10.1093/molbev/msh075 · Cited by 945
Self-citationThe origin and early diversification of angiosperms
Crane, P. R., Friis, E. M., & Pedersen, K. R. (1995) · Nature · doi:10.1038/374027a0 · Cited by 785
Cited by
Algae-bacteria interactions: Evolution, ecology and emerging applications
Ramanan, R., Kim, B.-H., Cho, D.-H., Oh, H.-M., & Kim, H.-S. (2016) · Biotechnology Advances · doi:10.1016/j.biotechadv.2015.12.003 · Cited by 1,301
Experimental evolution of multicellularity
Ratcliff, W. C., Denison, R. F., Borrello, M., & Travisano, M. (2012) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1115323109 · Cited by 570
The green seaweed Ulva: a model system to study morphogenesis
Wichard, T., Charrier, B., Mineur, F., Bothwell, J. H., Clerck, O. D., & Coates, J. C. (2015) · Frontiers in Plant Science · doi:10.3389/fpls.2015.00072 · Cited by 255
The Weng'an biota and the Ediacaran radiation of multicellular eukaryotes
Xiao, S., Muscente, A. D., Chen, L., Zhou, C., Schiffbauer, J. D., Wood, A. D., Polys, N. F., & Yuan, X. (2014) · National Science Review · doi:10.1093/nsr/nwu061 · Cited by 172
Comparative and Functional Algal Genomics
Blaby-Haas, C. E., & Merchant, S. S. (2019) · Annual Review of Plant Biology · doi:10.1146/annurev-arplant-050718-095841 · Cited by 131
Metadata
- Authors
- Herron, M. D., Hackett, J. D., Aylward, F. O., & Michod, R. E.
- Venue
- Proceedings of the National Academy of Sciences
- Published
- 2009-03-03
- Volume
- 106
- Issue
- 9
- Pages
- 3254-3258
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- OpenAlex
- W2166677095
- Cited by
- 284
- References
- 33
- FWCI
- 3.96
- Type
- journal article
- Language
- en
- Open access
- green
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
How to cite
Cite CoChat for the checks on this page, and the paper for its own findings.
- This page
- CoChat. (2026). Citation check: Triassic origin and early radiation of multicellular volvocine algae. https://app.cochat.ai/papers/10.1073/pnas.0811205106
- The paper
- Herron, M. D., Hackett, J. D., Aylward, F. O., & Michod, R. E. (2009). Triassic origin and early radiation of multicellular volvocine algae. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.0811205106
Data sources
Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
