Bone growth marks reveal protracted growth in New Zealand kiwi (Aves, Apterygidae)
AUTOR(ES)
Bourdon, Estelle
FONTE
The Royal Society
RESUMO
The presence of bone growth marks reflecting annual rhythms in the cortical bone of non-avian tetrapods is now established as a general phenomenon. In contrast, ornithurines (the theropod group including modern birds and their closest relatives) usually grow rapidly in less than a year, such that no annual rhythms are expressed in bone cortices, except scarce growth marks restricted to the outer cortical layer. So far, cyclical growth in modern birds has been restricted to the Eocene Diatryma, the extant parrot Amazona amazonica and the extinct New Zealand (NZ) moa (Dinornithidae). Here we show the presence of lines of arrested growth in the long bones of the living NZ kiwi (Apteryx spp., Apterygidae). Kiwis take 5–6 years to reach full adult body size, which indicates a delayed maturity and a slow reproductive cycle. Protracted growth probably evolved convergently in moa and kiwi sometime since the Middle Miocene, owing to the severe climatic cooling in the southwest Pacific and the absence of mammalian predators.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=2781955Documentos Relacionados
- Plasma rich in growth factors and bone formation: a radiological and histomorphometric study in New Zealand rabbits
- Observations on the Cell Masses in the Cerebral Hemisphere of the New Zealand Kiwi (Apteryx Australis)1
- New host and geographical records for helminths parasites of Ardeidae (Aves, Ciconiiformes) in Brazil
- New molecular evidence supports the species status of Kaempfer's Woodpecker (Aves, Picidae)
- Osteologia craniana de Nyctibiidae (Aves, Caprimulgiformes)