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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Long-distance dispersal in a fire- and livestock-protected savanna

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Tarazi, Roberto [1] ; Sebbenn, Alexandre M. [2] ; Kageyama, Paulo Y. [3] ; Vencovsky, Roland [1]
Total Authors: 4
[1] Univ Sao Paulo, Dept Genet, BR-13418900 Piracicaba, SP - Brazil
[2] Inst Florestal Sao Paulo, BR-13400970 Piracicaba, SP - Brazil
[3] Univ Sao Paulo, Dept Ciencias Florestais, BR-13418900 Piracicaba, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: ECOLOGY AND EVOLUTION; v. 3, n. 4, p. 1003-1015, APR 2013.
Web of Science Citations: 8

Savannas are highly diverse and dynamic environments that can shift to forest formations due to protection policies. Long-distance dispersal may shape the genetic structure of these new closed forest formations. We analyzed eight microsatellite loci using a single-time approach to understand contemporary pollen and effective seed dispersal of the tropical tree, Copaifera langsdorffii Desf. (Fabaceae), occurring in a Brazilian fire- and livestock-protected savanna. We sampled all adult trees found within a 10.24ha permanent plot, young trees within a subplot of 1.44ha and open-pollinated seeds. We detected a very high level of genetic diversity among the three generations in the studied plot. Parentage analysis revealed high pollen immigration rate (0.64) and a mean contemporary pollen dispersal distance of 74m. In addition, half-sib production was 1.8 times higher than full-sibs in significant higher distances, indicating foraging activity preference for different trees at long distances. There was a significant and negative correlation between diameter at breast height (DBH) of the pollen donor with the number of seeds (r=0.640, P-value=0.032), suggesting that pollen donor trees with a higher DBH produce less seeds. The mean distance of realized seed dispersal (recruitment kernel) was 135m due to the large home range dispersers (birds and mammals) in the area. The small magnitude of spatial genetic structure found in young trees may be a consequence of overlapping seed shadows and increased tree density. Our results show the positive side of closed canopy expansion, where animal activities regarding pollination and seed dispersal are extremely high. (AU)

FAPESP's process: 06/04490-9 - Genetic diversity, spatial genetic structure, mating system and gene flow in a population of Copaifera langsdorffii Desf. in the savanna
Grantee:Roberto Tarazi
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 07/06648-1 - Genetics and reproductive system of populations of native species from the cerrado biome
Grantee:Paulo Yoshio Kageyama
Support Opportunities: Regular Research Grants