Tree Genetics & Genomes

, Volume 8, Issue 6, pp 1191–1201

Fine-scale genetic dynamics of a dominant neotropical tree in the threatened Brazilian Atlantic Rainforest

  • Fábio de Almeida Vieira
  • Cristiane Gouvêa Fajardo
  • Anderson Marcos de Souza
  • Cristiane Aparecida Fioravante Reis
  • Dulcinéia de Carvalho
Original Paper

DOI: 10.1007/s11295-012-0506-7

Cite this article as:
de Almeida Vieira, F., Fajardo, C.G., de Souza, A.M. et al. Tree Genetics & Genomes (2012) 8: 1191. doi:10.1007/s11295-012-0506-7

Abstract

We present a case study of the relationship between spatial genetic structure (SGS) and age structure in Protium spruceanum (Burseraceae), an insect-pollinated, mass-fruiting, and secondary bird-dispersed tree, as determined through variation in allozyme loci. Using ten polymorphic loci, we investigated spatial and temporal patterns of a genetic structure within a 40 m × 60 m plot in a small (1.0 ha) fragment of Atlantic Rainforest to investigate the processes shaping the distribution of genetic diversity. Individuals (n = 345) from seedlings to adults were grouped and analyzed in four diameter classes. The results showed a high average level of genetic diversity (He = 0.438), but genetic diversity parameters did not vary significantly among cohorts. The spatial distribution pattern analysis of individuals showed significant levels of aggregation among small- and medium-diameter classes and random distribution among the highest diameter class, likely due to processes of competitive thinning. There was an association between demographic and SGS at short distances (less than 10 m) which is likely the consequence of restricted seed dispersal. The degree of SGS decreased across small- to large-diameter classes. We inferred that limited seed dispersal and subsequent density-dependent mortality from the family clusters are responsible for the observed changes in fine-scale SGS across different demographic classes.

Keywords

Cohorts Genetic diversity Protium spruceanum Random thinning Seedling bank Spatial patterning 

Supplementary material

11295_2012_506_MOESM1_ESM.doc (155 kb)
Electronic Supplementary Material(DOC 155 kb)

Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Fábio de Almeida Vieira
    • 1
  • Cristiane Gouvêa Fajardo
    • 2
  • Anderson Marcos de Souza
    • 3
  • Cristiane Aparecida Fioravante Reis
    • 4
  • Dulcinéia de Carvalho
    • 5
  1. 1.Unidade Acadêmica Especializada em Ciências AgráriasUniversidade Federal do Rio Grande do NorteMacaíbaBrazil
  2. 2.Departamento de Biologia Celular e GenéticaUniversidade Federal do Rio Grande do NorteNatalBrazil
  3. 3.Departamento de Engenharia FlorestalUniversidade de BrasíliaBrasíliaBrazil
  4. 4.Embrapa FlorestasColomboBrazil
  5. 5.Departamento de Ciências FlorestaisUniversidade Federal de LavrasLavrasBrazil

Personalised recommendations