AOBPreview originally published online on June 22, 2005
Annals of Botany 2005 96(3):445-455; doi:10.1093/aob/mci193
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Phenological Variation Within and Among Populations of Plathymenia reticulata in Brazilian Cerrado, the Atlantic Forest and Transitional Sites
1 Departamento de Biologia Geral and 2 Departamento de Botânica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, 31270-010, Belo Horizonte, MG, Brazil
* For correspondence. E-mail lovatomb{at}icb.ufmg.br
Received: 24 November 2004 Returned for revision: 23 February 2005 Accepted: 9 May 2005 Published electronically: 22 June 2005
• Background and Aims Plathymenia reticulata (Leguminosae) is a Brazilian tree that occurs in two biomes: Cerrado, a woody savanna vegetation, and the Atlantic Forest, a tropical forest. In this study, phenological patterns and their variability within and among populations located in these biomes and in transitional zones between them were assessed.
• Methods During a 15-month period, individuals from two populations in Cerrado, two in the Atlantic Forest, and six in transitional zones (three in a cerrado-like environment and three in forest fragments) were evaluated in Minas Gerais State, Brazil. The individuals were evaluated monthly according to the proportion of the canopy in each vegetative phenophase (leaf fall, leaf flush and mature leaves) and each reproductive phenophase (floral buds, flowers, immature fruits and mature fruit/seed dispersal). In order to assess the phenological variability within and among populations, habitats and biomes, the Shannon–Wiener diversity index, the Morisita–Horn similarity index and genetic population approach of partitioning diversity were used.
• Key Results Populations of P. reticulata, in general, showed similar phenology; the main differences were related to leaf fall, a process that starts months earlier in the Cerrado than in transitional sites, and even later in forest areas. Considerable synchrony was observed for reproductive phenology among populations and between biomes. Most phenological diversity was due to differences among individuals within populations.
• Conclusion In spite of environmental differences, P. reticulata from the Atlantic Forest and Cerrado showed similar phenological behavior with only about 10 % of the total diversity being attributed to differences between biomes.
Key words: Atlantic Forest, Cerrado, Morisita–Horn similarity index, leaf phenology, Plathymenia foliolosa, Plathymenia reticulata, reproductive phenology, Shannon–Wiener diversity index
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