MBE Advance Access published online on March 13, 2006
Molecular Biology and Evolution, doi:10.1093/molbev/msj124
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1 Allan Wilson Center for Molecular Ecology and Evolution Institute of Molecular BioSciences Massey University Palmerston North New Zealand; Division of Evolutionary Molecular Systematics Department of Cell and Organism Biology University of Lund Solvegatan 29 S-223 62 Lund Sweden
* To whom correspondence should be addressed. Testing models of macroevolution, and especially the sufficiency of microevolutionary processes, requires good collaboration between molecular biologists and paleontologists. We report such a test for events around the Late Cretaceous by describing the earliest penguin fossils, analyzing complete mitochondrial genomes from an albatross, a petrel and a loon, and describe the gradual decline of pterosaur at the same time modern birds radiate. The penguin fossils comprise four naturally associated skeletons from the New Zealand Waipara Greensand, a Paleocene (early Tertiary) formation just above a well-known Cretaceous/Tertiary boundary site. The fossils, a new genus (Waimanu), provide a lower estimate of 61-62 Ma for the divergence between penguins and other birds and thus establish a reliable calibration point for avian evolution. Combining fossil calibration points, DNA sequences, maximum likelihood and Bayesian analysis, the penguin calibrations imply a radiation of modern (crown-group) birds in the Late Cretaceous. This includes a conservative estimate that modern sea and shorebird lineages diverged at least by the Late Cretaceous about 74 ± 3 Ma (Campanian). It is clear that modern birds from at least the latest Cretaceous lived at the same time as archaic birds including Hesperornis, Ichthyornis and the diverse Enantiornithiformes. Pterosaurs, which also coexisted with early crown-birds, show notable changes through the Late Cretaceous. There was a decrease in taxonomic diversity, and small- to medium-sized species disappeared well before the end of the Cretaceous. A simple reading of the fossil record might suggest competitive interactions with birds, but much more needs to be understood about pterosaur life histories. Additional fossils and molecular data are still required to help understand the role of biotic interactions in the evolution of Late Cretaceous birds and thus to test that the mechanisms of microevolution are sufficient to explain macroevolution. *These authors contributed equally to this work.
Accepted March 1, 2006
Research Article
Early Penguin Fossils, plus Mitochondrial Genomes, Calibrate Avian Evolution
Kerryn E. Slack 1
,
Craig M. Jones 2
,
Tatsuro Ando 3
,
G. L. (Abby) Harrison 4,
R. Ewan Fordyce 3,
Ulfur Arnason 5,
and
David Penny 4 *
2 Institute of Geological and Nuclear Sciences Lower Hutt New Zealand
3 Department of Geology, University of Otago Dunedin New Zealand
4 Allan Wilson Center for Molecular Ecology and Evolution Institute of Molecular BioSciences Massey University Palmerston North New Zealand
5 Division of Evolutionary Molecular Systematics Department of Cell and Organism Biology University of Lund Solvegatan 29 S-223 62 Lund Sweden
David Penny, E-mail: d.penny{at}massey.ac.nz
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