Combinatorial functional diversity : an information theoretical approach
Combinatorial functional diversity : an information theoretical approach
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组合功能多样性：一种信息论方法
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
D. Schmera
中科院分区：
文献类型：
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作者：
J. Podani;C. Ricotta;J. Pausas;D. Schmera
根据 P. Juhasz-Nagy 的花多样性概念，开发了一种基于两种状态名义性状的功能多样性测量新方法。为了评估组合的功能多样性，首先编制物种矩阵的特征。各种信息论函数用于检查该矩阵中的结构特性，包括特征组合的频率分布。该方法通过实际例子进行说明，第一个来自西班牙易发生火灾的植物群落，第二个来自匈牙利的自来水无脊椎动物群落。结果表明，在使用标准化联合熵的各种函数中，称为组合函数均匀性提供了最有意义的结果。在植物群落中，高火灾复发率降低了组合功能均匀度，而淡水组合的这项措施与溪流宽度不相关，与人类影响程度呈负相关。流宽度与表现的功能组合的数量负相关。在这两个案例研究中，组合功能均匀度与物种丰富度呈反比关系，即物种越少，产生等概率功能组合的机会就越大。
A new approach to the measurement of functional diversity based on two-state nominal traits is developed from the florula diversity concept of P. Juhasz-Nagy. For evaluating functional diversity of an assemblage, first a traits by species matrix is compiled. Various information theory functions are used to examine structural properties in this matrix, including the frequency distribution of trait combinations. The method is illustrated by actual examples, the first from plant communities prone to fire in Spain, and the second from running water invertebrate assemblages in Hungary. The results suggest that of the various functions used the standardized joint entropy, termed combinatorial functional evenness supplies most meaningful results. In plant communities, high fire recurrence decreased combinatorial functional evenness, while this measure for freshwater assemblages was uncorrelated with stream width and negatively correlated with the degree of human impact. Stream width is negatively correlated with the number of manifested functional combinations. In both case studies, combinatorial functional evenness has an inverse relationship to species richness – i.e., fewer species have a larger chance to produce equiprobable functional combinations.