Untangling the importance of niche breadth and niche position as drivers of tree species abundance and occupancy across biogeographic regions

Dilys M. Vela Díaz, Cecilia Blundo, Leslie Cayola, Alfredo F. Fuentes, Lucio R. Malizia & Jonathan A. Myers
Aim: 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. Location: Argentinian Andes; Bolivian Amazon; Missouri Ozarks. Time period: 2002–2010. Major taxa...
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