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|Title:||Extreme reversed sexual size dimorphism in the extinct New Zealand moa Dinornis|
|Citation:||Nature, 2003; 425(6954):172-175|
|Publisher:||Nature Publishing Group|
|Michael Bunce, Trevor H. Worthy, Tom Ford, Will Hoppitt, Eske Willerslev, Alexei Drummond and Alan Cooper|
|Abstract:||The ratite moa (Aves; Dinornithiformes) were massive graviportal browsers weighing up to 250 kg (ref. 1) that dominated the New Zealand biota until their extinction approximately 500 yr ago. Despite an extensive Quaternary fossil record, moa taxonomy remains problematic and currently 11 species are recognized. Three Dinornis species were found throughout New Zealand and differed markedly in size (1-2 m height at back) and mass (from approximately 34 to 242 kg). Surprisingly, ancient mitochondrial DNA sequences show that the three species were genetically indistinguishable within each island, but formed separate North and South Island clades. Here we show, using the first sex-linked nuclear sequences from an extinct species, that on each island the three morphological forms actually represent just one species, whose size varied markedly according to sex and habitat. The largest females in this example of extreme reversed sexual size dimorphism were about 280% the weight and 150% the height of the largest males, which is unprecedented among birds and terrestrial mammals. The combination of molecular and palaeontological data highlights the difficulties of analysing extinct groups, even those with detailed fossil records.|
|Keywords:||Bone and Bones; Animals; Palaeognathae; Body Weight; DNA, Mitochondrial; Body Constitution; Ecosystem; Phylogeny; Sex Characteristics; Geography; Time Factors; Fossils; Molecular Sequence Data; New Zealand; Female; Male; Biological Evolution; Sex Determination Analysis|
|Description:||© 2003 Nature Publishing Group|
|Appears in Collections:||Earth and Environmental Sciences publications|
Australian Centre for Ancient DNA publications
Environment Institute Leaders publications
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