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| Author(s): |
Tiago da Silva Ribeiro
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto de Biociências (IBIOC/SB) |
| Defense date: | 2014-01-29 |
| Examining board members: |
Cristina Yumi Miyaki;
João Miguel de Barros Alexandrino;
Mercival Roberto Francisco
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| Advisor: | Cristina Yumi Miyaki |
| Abstract | |
Phylogeographic studies aim to analyze the distribution of the genetic diversity of a given species. In addition, studies of co-distributed organisms enable to infer historic processes acting on the region where they occur. In this context the present work intended to study the phylogeography of two Atlantic Forest endemic birds, Chiroxiphia caudata and Hemitriccus diops to help to understand how this biome evolved. 112 individuals of C. caudata and 82 of H. diops were sampled throughout their distributions. We obtained partial sequences of the mitochondrial gene ND2 (932 bp and 910 bp, respectively, for C. caudata and H. diops), of an intron of the G3PDH gene (303 bp and 323 bp, respectively), and introns from the ODC gene (517 bp) of H. diops. No signal of phylogeographic structure was found for C. caudata,, which exhibits signal of recent demographic expansion. The absence of population structure may be a consequence of the species long generation time. Models of distribution during the last glacial maximum exhibited two discordant scenarios: one with its main distribution in the north and another with a similar or larger distribution than the current one. In contrast, we found a shallow, but clear phylogeographic structure for H. diops. The demographic history, however, was not clear, with signal of both demographic expansion and stability during the glacial cycles. The different phylogeographic patterns found here are congruent with the diversity of patterns observed in other Atlantic Forest organisms, reflecting the complex history of the biome (AU) | |
| FAPESP's process: | 11/05399-3 - Phylogeography of Chiroxiphia caudata (Pipridae, AVES) and of Hemitriccus diops (Tyrannidae, AVES): population structure and demographic history of passerines from Atlantic Rainforest |
| Grantee: | Tiago da Silva Ribeiro |
| Support Opportunities: | Scholarships in Brazil - Master |