| Autor: |
Ramos, Ana Carolina Simões, De Lemos-Filho, José Pires, Lovato, Maria Bernadete |
| Předmět: |
|
| Zdroj: |
Journal of Heredity; Mar/Apr2009, Vol. 100 Issue 2, p206-216, 11p, 3 Diagrams, 2 Charts, 1 Graph |
| Abstrakt: |
The phylogeography of Hymenaea coarbaril var. stiIhocarpa from Atlantic Forest and riverine forests of the Cerrado biome in central and southeastern Brazil was investigated. The data were compared with those of its congeneric Hymenaea stionocarpa, a typical tree from savanna. In the Cerrado, H. courbaril var. stillbocarpa is found in sites contiguous with those of H stigonocarpa, and they share common life-history attributes. The psbC/tmS3 region of the chloroplast DNA was sequenced in 149 individuals of H. courbaril stilbocarpa. High genetic variation was found in this species, with the identification of 18 haplotypes, similarly to what was found in H stigonocarpa with 23 haplotypes in the same geographic region. Populations of H courbaril var. stiIbocarpa could be structured in 3 phylogeographic groups. Spatial analysis of molecular variation indicated that 46.4% of the genetic variation was due to differences among these groups. Three haplotypes were shared by H. courbaril vat. stilbocatpa and H stillgonocarpa, and only 10.5% of the total genetic variation could be attributed to between-species difference. We surmise that during the glacial times, H. courbaril var. stilbocarpa populations must have gone extinct in most parts of the southern of its present-day occurrence area. After climate amelioration, these areas were probably recolonized from northern and eastern. The relatively similar phylogeographic structure of vicariant Hlymenaea species suggests that they were subjected to the same impacts during the Quaternary climatic fluctuations. The sharing of haplotypes and the genetic similarity between the 2 Hymenaea species suggest the existence of ancestral polymorphism and/or hybridization. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
