Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/242383
Type: Artigo de periódico
Title: Elevation As A Barrier: Genetic Structure For An Atlantic Rain Forest Tree (bathysa Australis) In The Serra Do Mar Mountain Range, Se Brazil
Author: Reis
Talita Soares; Ciampi-Guillardi
Maisa; Bajay
Miklos Maximiliano; de Souza
Anete Pereira; Maes dos Santos
Flavio Antonio
Abstract: Distance and discrete geographic barriers play a role in isolating populations, as seed and pollen dispersal become limited. Nearby populations without any geographic barrier between them may also suffer from ecological isolation driven by habitat heterogeneity, which may promote divergence by local adaptation and drift. Likewise, elevation gradients may influence the genetic structure and diversity of populations, particularly those marginally distributed. Bathysa australis (Rubiaceae) is a widespread tree along the elevation gradient of the Serra do Mar, SE Brazil. This self-compatible species is pollinated by bees and wasps and has autochoric seeds, suggesting restricted gene dispersal. We investigated the distribution of genetic diversity in six B.australis populations at two extreme sites along an elevation gradient: a lowland site (80-216m) and an upland site (1010-1100m.a.s.l.). Nine microsatellite loci were used to test for genetic structure and to verify differences in genetic diversity between sites. We found a marked genetic structure on a scale as small as 6km (F-ST=0.21), and two distinct clusters were identified, each corresponding to a site. Although B.australis is continuously distributed along the elevation gradient, we have not observed a gene flow between the extreme populations. This might be related to B.australis biological features and creates a potential scenario for adaptation to the different conditions imposed by the elevation gradient. We failed to find an isolation-by-distance pattern; although on the fine scale, all populations showed spatial autocorrelation until similar to 10-20m. Elevation difference was a relevant factor though, but we need further sampling effort to check its correlation with genetic distance. The lowland populations had a higher allelic richness and showed higher rare allele counts than the upland ones. The upland site may be more selective, eliminating rare alleles, as we did not find any evidence for bottleneck.
Subject: Recent Population Bottlenecks
Allele Frequency Data
Southeastern Brazil
Altitudinal Gradient
Floristic Composition
Ecological Determinants
Plant-populations
Computer-program
Poa-hiemata
State-park
Country: HOBOKEN
Editor: WILEY-BLACKWELL
Rights: aberto
Identifier DOI: 10.1002/ece3.1501
Address: http://onlinelibrary.wiley.com/doi/10.1002/ece3.1501/abstract
Date Issue: 2015
Appears in Collections:Unicamp - Artigos e Outros Documentos

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