Dispersal modes and fruiting periods in hyperseasonal and seasonal savannas, central Brazil
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Data
2009-03
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Editor
Sociedade Botânica do Brasil
Resumo
Seasonal savannas are characterized by an intense drought that influences their functioning. Hyperseasonal savannas experience additionally a waterlogging during the rainy season. In South America, the largest savanna environment is the Brazilian cerrado. To assess whether a particular dispersal mode or fruiting period is associated to the waterlogging, we examined dispersal and phenological groups in hyperseasonal and seasonal cerrado plant species. We compared the proportion of species and individuals in these groups with G-tests for independence in contingency tables. We did not find differences in the proportion of species; however, based on the proportion of individuals, the main dispersal strategy was anemochory in the hyperseasonal cerrado and zoochory in the seasonal cerrado. Phenological strategies of fruiting in safe periods of the year were differently selected in both cerrados. In the hyperseasonal cerrado, most individuals fruited in non-waterlogged periods, whereas in the seasonal cerrado, most individuals fruited in wetter periods. Thus, waterlogging may drive important modifications in the efficiency of the dispersal and phenological strategies of hyperseasonal savannas plants.
Descrição
Palavras-chave
Cerrado, Dispersal modes, Guilds, Phenology, Waterlogging, Alagamento, Guildas, Modos de dispersão
Citação
SILVA, Igor Aurélio; CIANCIARUSO, Marcus Vinicius; BATALHA, Marco Antônio. Dispersal modes and fruiting periods in hyperseasonal and seasonal savannas, central Brazil. Revista Brasileira de Botânica, São Paulo, v. 32, n. 1, p. 155-163, Jan./Mar. 2009.