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原文連結
論文資訊
- 類型：已發表論文
- 日期：2014-09-15
摘要
The processes causing the latitudinal gradient in 物種 richness remain elusive. Ecological theories for the origin of 生物多樣性 gradients, such as competitive exclusion, neutral dynamics, and environmental filtering, make predictions for how functional 多樣性 should vary at the alpha (within local assemblages), beta (among assemblages), and gamma (regional pool) scales. We test these predictions by quantifying hypervolumes constructed from functional traits representing major axes of plant strategy variation (specific leaf area, plant height, and seed mass) in tree assemblages spanning the temperate and tropical New World. Alpha-scale trait volume decreases with absolute latitude and is often lower than sampling expectation, consistent with environmental filtering theory. Beta-scale overlap decays
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