The roles of environment, space, and phylogeny in determining functional dispersion of rodents (Rodentia) in the Hengduan Mountains, China.
The roles of environment, space, and phylogeny in determining functional dispersion of rodents (Rodentia) in the Hengduan Mountains, China.
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DOI：
10.1002/ece3.3613
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发表时间：
2017-12
影响因子：
2.6
通讯作者：
Yang Q
中科院分区：
文献类型：
--
作者：
Du Y;Wen Z;Zhang J;Lv X;Cheng J;Ge D;Xia L;Yang Q
最近描述的基于性状的方法正变得越来越流行，用于对物种共存的机械理解。然而，功能分析中最大的挑战是分解不同生态和进化过程的贡献（例如，生态位过程、中性过程和进化过程）来确定性状结构。捕捉啮齿动物本研究以横断山区啮齿目动物（Rodentia）为研究模型，旨在（1）量化头体长（HL）、尾体比（TR）、食物中动物成分（ACD）和所有性状的垂直功能结构模式;（2）理清不同组装过程的相对重要性（3）评估Bergmann规则和艾伦规则在沿着海拔梯度上的可行性。我们的研究结果表明，垂直功能结构模式在这三个性状之间存在差异，表明在群落组装过程中具有不同的功能作用。这些非随机的垂直分布格局表明，这些特征受沿着环境梯度不同生态过程的控制。在方差分配中，环境和空间模型解释了性状分散的高比例空间变异，这些模型为主导物种共存中的生态位和中性过程提供了强有力的证据。虽然这3个性状都表现出明显的系统发育信号，但群落内的系统发育关系并不能预测功能分布的空间变异，证实了系统发育信号在预测性状结构方面的巨大作用。通过评估HL和TR在目和科水平上的垂直模式，我们认为，沿着环境梯度的功能适应沿着是一系列复杂过程的替代（例如，环境过滤、种间相互作用和中性扩散）作用于多个功能轴，导致沿沿着海拔梯度与经验规则不一致。
The recently described trait‐based approach is becoming widely popular for a mechanistic understanding of species coexistence. However, the greatest challenge in functional analyses is decomposing the contributions of different ecological and evolutionary processes (e.g., niche‐based process, neutral process, and evolutionary process) in determining trait structure. Taking rodents (Rodentia) in the Hengduan Mountains as our study model, we aim to (1) quantify the vertical patterns of functional structure for head–body length (HL), tail/body ratio (TR), animal component in diet (ACD), and all traits; (2) disentangle the relative importance of different assembly processes (environment, space, and phylogeny) in structuring trait dispersion; and (3) assess the feasibility of Bergmann's rule and Allen's rule along elevational gradient. Our results have suggested that the vertical functional structure pattern varied across these three traits, indicating distinct functional roles in the community assembly process. These nonrandom vertical patterns of HL, TR, and terminal ACD have demonstrated these traits were dominated by different ecological process along environmental gradient. In variance partitioning, high proportion of the spatial variations in trait dispersion was explained by environmental and spatial models, which have provided supporting strong evidence for niche‐based and neutral processes in leading species coexistence. Although the three traits all exhibited apparent phylogenetic signals, phylogenetic relationship within community failed to predict the spatial variations of functional dispersion, confirming the enormous inference of phylogenetic signals in predicting trait structure. By assessing the vertical patterns of HL and TR at order and family levels, we argued that functional adaptation along an environmental gradient is a surrogate of series of complex processes (e.g., environmental filtering, interspecific interaction, and neutral dispersal) acting on multiple functional axes, which results in inconsistence with the empirical rules along elevational gradient.
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