Can we predict dispersal guilds based on the leaf-height-seed scheme in a disjunct cerrado woodland?

Brazilian Journal of Biology

Avf. Jardim¹  Ma. Batalha¹ 

[1] ,Universidade Federal de São Carlos Departamento de Botânica São Carlos SP ,Brazil

关键词: savanna;    dispersal groups;    functional traits;    logistic regression;    ecological strategy;    savana;    guildas de dispersão;    atributos funcionais;    regressão logística;    estratégia ecológica;   

DOI  :  10.1590/S1519-69842008000300013

来源: SciELO

【 摘 要 】

Although there have been advances in methods for extracting information about dispersal processes, it is still very difficult to measure them. Predicting dispersal groups using single readily-measured traits would facilitate the emergence of instructive comparisons among ecological strategies of plants and offer a path towards improved synthesis across field experiments. The leaf-height-seed scheme consists of three functional traits: specific leaf area, plant canopy height, and seed mass. We tested, applying logistic regression analysis, whether these traits are potential predictors of dispersal guilds in a disjoint cerrado woodland site in southeastern Brazil. According to our results, none of the plant traits studied could predict dispersal guild; this means that abiotically and biotically dispersed species showed similar values of specific leaf area, height, and seed mass. The species of both guilds exhibited sclerophylly, probably a result of the typical soil nutrient deficiency of cerrado, which also may have placed constraints upon plant canopy height regardless of the dispersal mode. In the cerrado, some abiotically dispersed trees might present higher than expected seed mass as support to the investment in high root-to-shoot ratio at the seedling stage. Seeds of bird-dispersed species are limited in size and mass because of the small size of most frugivorous birds. Since soil nutrient quality might contribute to the similarity between the dispersal guilds regarding the three traits of the scheme, other plant traits (e.g., root depth distribution and nutrient uptake strategy) that detail the former should be considered in future predictive studies.

【 授权许可】

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