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首页> 外文期刊>Marine ecology progress series >How biodiversity affects ecosystem functioning: roles of infaunal species richness, identity and density in the marine benthos
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How biodiversity affects ecosystem functioning: roles of infaunal species richness, identity and density in the marine benthos

机译：生物多样性如何影响生态系统功能：海洋底栖动物中非生物物种丰富度，同一性和密度的作用

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The extent to which changes in biodiversity are causally linked to key ecosystem processes is a primary focus of contemporary ecological research. Highly controlled manipulative experiments have revealed significant and positive effects of increased diversity on ecosystem functioning, but uncertainties in experimental design have made it difficult to determine whether such effects are related to the number of species or to effects associated with species identity and density. Using infaunal marine invertebrates, we established 2 parallel laboratory experiments to examine the hypothesis that changes in the composition of benthic macrofauna alter the biogeochemistry of coastal intertidal mudflats. Our study identified clear effects of increased infaunal species diversity on nutrient generation. However, significant species identity and density effects underpin the observed response, reflecting species-specific traits associated with bioturbation. Post-hoc examination of our conclusions using power analysis revealed that, given our experimental design, the probability of finding a correct significant effect, the minimum detectable difference necessary to detect a significant effect, and the minimum number of replicates necessary in order to achieve an acceptable power, all differed between species. Our study has important implications for the design of biodiversity-ecosystem function experiments because the disparity between the contributions that individual species make to ecosystem function demands the use of different levels of replication for each species within an experiment.
机译：生物多样性变化在多大程度上与关键的生态系统过程有因果关系，是当代生态研究的主要重点。高度受控的操纵性实验已经揭示了多样性增加对生态系统功能的显着积极影响，但是实验设计的不确定性使得很难确定这种影响是与物种数量有关还是与物种同一性和密度有关。我们使用不育动物海洋无脊椎动物建立了两个平行的实验室实验，以检验以下假设：底栖大型动物组成的变化会改变沿海潮间带滩涂的生物地球化学。我们的研究确定了增加臭名昭著的物种多样性对养分产生的明显影响。但是，显着的物种同一性和密度效应是观察到的响应的基础，反映了与生物扰动有关的物种特定性状。使用功效分析对我们的结论进行事后检查，发现在给定我们的实验设计的情况下，找到正确的显着效果的可能性，检测到显着效果所需的最小可检测差异以及为实现检测结果所需的最小重复次数。可接受的功率，所有物种之间都不同。我们的研究对生物多样性-生态系统功能实验的设计具有重要意义，因为单个物种对生态系统功能的贡献之间的差异要求实验中每个物种使用不同水平的复制。

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