Ecological niches shape species commonness and rarity, yet, the relative importance of different niche mechanisms within and across ecosystems remains unresolved. We tested the influence of niche breadth (range of environmental conditions where species occur) and niche position (marginality of a species’ environmental distribution relative to the mean environmental conditions of a region) on tree‐species abundance and occupancy across three biogeographic regions.

中文翻译：

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阐明生态位宽度和生态位的重要性是生物地理区域树种丰富度和占有率的驱动力

生态位塑造了物种的共性和稀有性，但是，生态系统内部和生态系统中不同生态位机制的相对重要性仍未得到解决。我们测试了生态位宽度（物种发生的环境条件的范围）和生态位位置（物种的环境分布相对于某个区域的平均环境条件的边际）对三个生物地理区域树种丰度和占有率的影响。