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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.)

High rates of pollen and seed flow in Hymenaea stigonocarpa on a highly fragmented savanna landscape in Brazil

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Garcia, Andrea S. [1] ; Bressan, Eduardo A. [1] ; Ballester, Maria Victoria R. [1] ; Figueira, Antonio [1] ; Sebbenn, Alexandre M. [2]
Total Authors: 5
[1] Univ Sao Paulo, Ctr Energia Nucl Agr, Sao Paulo - Brazil
[2] Inst Florestal Sao Paulo, Secao Melhoramento & Conservacao Genet Florestal, Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: NEW FORESTS; v. 50, n. 6, p. 991-1006, NOV 2019.
Web of Science Citations: 1

Genetic diversity of tree populations is mainly determined by pollen and seed flow. In turn, dispersal agents are affected by landscape composition and configuration. Understanding the effects of anthropization on pollen and seed dispersal in natural environments is crucial to developing long-term strategies for in situ and ex situ conservation of Neotropical savanna tree species. Here, we evaluated the genotypic and genetic diversity, spatial genetic structure (SGS), and pollen and seed dispersal of the endangered tree species Hymenaea stigonocarpa in a 2200-ha plot established in a strongly fragmented savanna landscape in Brazil. A total of 157 individuals were identified, 66 juveniles and 91 adults. Height, root-collar diameter for juveniles and diameter at breast height for adults were determined for each individual, and leaves were sampled to be used in genotyping by microsatellites. Genotypic diversity (R) was similarly high in adults (0.87) and juveniles (0.80), indicating more sexual reproduction than clonal. Heterozygosities were also similar between both generations, and no inbreeding was detected. Adults and juveniles present SGS, but the extent measured by the Sp-statistic was not significant. Both pollen and seed flow were elevated (24.2%) and reached long distances (3778 m and 3914 m, respectively) within the sampled area, but the pattern was not fat-tailed, indicating that most dispersal was over shorter distances. We conclude that fragmentation does not reproductively isolate the sampled population because individuals located outside the area may serve as sources of gene flow between remnant forest patches; however, the probability of dispersal over long distances is reduced. (AU)

FAPESP's process: 15/05103-8 - Dynamics of land use and land cover in the agricultural frontier of Brazilian Amazon: driving forces of changes and future scenarios
Grantee:Andrea Santos Garcia
Support type: Scholarships in Brazil - Doctorate