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Enhancing The Ecological Significance Of Sediment Contamination Guidelines Through Integration With Community Analysis

机译：通过与社区分析相结合来提高沉积物污染指南的生态意义

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The underlying basis of sediment quality guidelines needs to be accepted both by the international scientific community and socially before they can be of use. Increasingly, this means that just saying that a certain number of species will be affected is not sufficient. Instead guidelines need to be related to changes in community composition and predicted changes in biodiversity and ecosystem function. This study derived guidelines for copper, zinc, and lead, from field-based SSDs, that predicted a 50% decrease in abundance of 5% of the taxa, well below present management guidelines. However, a multivariate model of effect demonstrated considerable changes in community composition occur at levels below these derived guidelines. Changes in the degree of rarity also occurred signaling potential changes to meta-community structure and resilience of the region. Furthermore, the most sensitive taxa indicated by the multivariate analysis were frequently of large size and those likely to affect oxygen, carbon, and nutrient exchanges between the water column and the seafloor, leading to ecological effects beyond the obvious change in composition. We suggest that guidelines should preferentially be field derived, backed where possible by experimental work. Community and functional responses should be calculated, from the same field studies, and explicitly mentioned whenever the guidelines are used to allow environmental costs to be more realistically determined.
机译：沉积物质量准则的基本基础需要得到国际科学界和社会的接受，然后才能使用。越来越多地，这意味着仅仅说一定数量的物种将受到影响是不够的。相反，指南需要与社区组成的变化以及生物多样性和生态系统功能的预测变化相关。这项研究从基于现场的固态硬盘中得出了铜，锌和铅的准则，该准则预测5％的类群的丰度降低了50％，远低于目前的管理准则。但是，一个多变量效应模型表明，在低于这些衍生准则的水平上，社区组成发生了相当大的变化。稀有程度的变化也发生了，这表明该地区的元社区结构和复原力可能发生变化。此外，多变量分析表明，最敏感的分类单元通常大小较大，并且可能影响水柱与海底之间的氧气，碳和养分交换，从而导致生态影响，而其组成没有明显变化。我们建议，指南应优先来自现场，并在可能的情况下通过实验工作予以支持。社区和功能响应应从相同的现场研究中计算得出，并在每当使用指南来更实际地确定环境成本时明确提及。

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