دورية أكاديمية
Diversification of Ramphastinae (Aves, Ramphastidae) prior to the Cretaceous/Tertiary boundary as shown by molecular clock of mtDNA sequences
| العنوان: | Diversification of Ramphastinae (Aves, Ramphastidae) prior to the Cretaceous/Tertiary boundary as shown by molecular clock of mtDNA sequences |
|---|---|
| المؤلفون: | Alves Nahum Laila, Pereira Sérgio Luiz, Campos Fernandes Flora Maria de, Russo Matioli Sergio, Wajntal Anita |
| المصدر: | Genetics and Molecular Biology, Vol 26, Iss 4, Pp 411-418 (2003) |
| بيانات النشر: | Sociedade Brasileira de Genética, 2003. |
| سنة النشر: | 2003 |
| المجموعة: | LCC:Genetics |
| مصطلحات موضوعية: | divergence times, K/T, mass extinction, cytochrome b, 12S rDNA, paleogeography, phylogeny, Genetics, QH426-470 |
| الوصف: | Partial cytochrome b and 12S rDNA mitochondrial DNA sequences of eight representatives of the Ramphastidae family were analyzed. We applied the linearized tree method to identify sequences evolving at similar rates and estimated the divergence times among some of the taxa analyzed. After excluding Ramphastos tucanus and Capito dayi from our data set, the remaining taxa presented a constant rate of DNA substitution, and branch lengths could be re-estimated with a clock constraint using the maximum likelihood method. Branch lengths were calibrated assuming that Galliformes and Piciformes split around 100 million years ago (mya). Our results indicate that Ramphastinae, and probably Capitoninae, diverged from other Piciformes in the Late Cretaceous (~82 mya), suggesting that Piciformes is another avian order that survived the mass extinction event occurred 65 mya at the Cretaceous/Tertiary (K/T) boundary. The divergence times estimated within the Ramphastinae genera cover the period from the Middle Eocene (around 47 mya) through the Late Miocene (9.5 mya). Our estimate of divergence time is coincidental with the split of the African and the South American continents and other intense geologic activities and modifications of the areas which correspond to the current Neotropics. These events might have influenced the diversification of Ramphastinae in South America. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1415-4757 1678-4685 |
| العلاقة: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000400003Test; https://doaj.org/toc/1415-4757Test; https://doaj.org/toc/1678-4685Test |
| الوصول الحر: | https://doaj.org/article/2e69048e619547908537f0a7ca3f7980Test |
| رقم الانضمام: | edsdoj.2e69048e619547908537f0a7ca3f7980 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 14154757 16784685 |
|---|