Phenological diversity, seasonality and leaf longevity may affect leaf habits, reflecting plant responses to environmental conditions. Maprounea guianensis Aubl. is a widespread species in Brazil that is associated with different forest types. We investigated how phenological diversity, seasonality and leaf longevity affect leaf habits of its populations growing in humid and dry forests in the Chapada Diamantina mountains. We made monthly observations of leaf budding and fall in 62 individual trees between 2004 and 2012 (84 months), estimating leaf longevity based on phenophase evaluations. We made use of circular statistics, cross correlations and the Shannon–Wiener Index to evaluate our data. There was little variation in rainfall distribution between the study years, although water availability differed at each site. Phenophase seasonality was found to be negatively correlated with rainfall but positively correlated with photoperiod. Low phenological diversity was observed within each site, but not between sites, and leaf longevity was reduced in the dry forest. Although macroclimatic conditions were similar throughout the range of occurrence of M. guianensis in the region, we found that phenological behaviour and leaf longevity differed according to micro-site differences, demonstrating the plasticity of the species, which may favour its occupation of different environments.

中文翻译：

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Maprounea guianensis（大戟科）在潮湿和干燥的新热带森林中的物候多样性

物候多样性、季节性和叶子寿命可能会影响叶子习性，反映植物对环境条件的反应。Maprounea guianensis Aubl。是巴西广泛分布的物种，与不同的森林类型有关。我们调查了物候多样性、季节性和叶子寿命如何影响生长在 Chapada Diamantina 山脉潮湿和干燥森林中的种群的叶子习性。我们在 2004 年至 2012 年（84 个月）期间对 62 棵个体树木的叶子发芽和落叶进行了每月观察，根据物候评估估计叶子寿命。我们利用循环统计、互相关和香农-维纳指数来评估我们的数据。尽管每个地点的可用水量不同，但研究年份之间的降雨分布几乎没有变化。发现物候季节性与降雨量呈负相关，而与光周期呈正相关。在每个站点内观察到低物候多样性，但在站点之间没有观察到，并且在干燥的森林中叶片寿命减少。尽管该地区的大气候条件在 M. guianensis 发生的范围内相似，但我们发现物候行为和叶片寿命根据微位点差异而不同，表明该物种的可塑性，这可能有利于其占领不同的环境。