Species richness-decomposition relationships depend on species dominance
Species richness-decomposition relationships depend on species dominance
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DOI：
10.1111/j.1461-0248.2004.00591.x
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发表时间：
2004-05-01
期刊：
影响因子：
8.8
通讯作者：
Malmqvist, B
中科院分区：
文献类型：
--
作者：
Dangles, O;Malmqvist, B
人类干扰既减少了生态系统中的物种数量，也改变了它们的相对丰度。在这里，我们提出的实地证据表明，物种丰富度的变化可以对生态系统功能的影响，是从物种丰富度的变化一样大。我们调查了空间和时间的变化，叶分解率和社区指标的食叶无脊椎动物（碎纸机）在流。碎纸机的社区组成显着影响的多样性功能的关系，分解是一个给定的物种丰富度高的优势比在网站的优势是低的网站。分解率也显着依赖于优势物种的身份。此外，分解的优势效应随季节变化，维持分解所需的物种数量随着均匀度的增加而增加。这些发现揭示了生物多样性-生态系统功能关系的重要但不太明显的方面。
Human disturbances both decrease the number of species in ecosystems and change their relative abundances. Here we present field evidence demonstrating that shifts in species abundances can have effects on ecosystem functioning that are as great as those from shifts in species richness. We investigated spatial and temporal variability of leaf decomposition rates and community metrics of leaf-eating invertebrates (shredders) in streams. The shredder community composition dramatically influenced the diversity-function relationship; decomposition was much higher for a given species richness at sites with high species dominance than at sites where dominance was low. Decomposition rates also markedly depended on the identity of the dominant species. Further, dominance effects on decomposition varied seasonally and the number of species required for maintaining decomposition increased with increasing evenness. These findings reveal important but less obvious aspects of the biodiversity-ecosystem functioning relationship.