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首页> 外文期刊>Science of the total environment >Risk assessment of salinity and turbidity in Victoria (Australia) to stream insects' community structure does not always protect functional traits
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Risk assessment of salinity and turbidity in Victoria (Australia) to stream insects' community structure does not always protect functional traits

机译：维多利亚州（澳大利亚）盐分和浊度风险评估对昆虫群落结构的影响并不总是能保护功能性状

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摘要

Ecological risk assessments mostly consider measures of community composition (structure) across large spatial scales. These assessments, using species sensitivity distributions (SSDs) or the relative species retention (RSR), may not be protective of ecosystem functions and services at smaller spatial scales. Here we examine how changes in biological traits, as proxy for ecosystem functions/services, at a fine spatial scale relate to larger scale assessment of structure. We use functional traits of stream insect species in south-east Australia in two habitats (riffle and edge/pool). We find that the protection of community structure in terms of 95% of species over multiple sites against adverse effects of salinity (as electrical conductivity) and turbidity will mostly, but not always, protect traits at smaller scales. Considering different combinations of trait modalities, contaminants and habitat, a mean of 17.5% (range 0%-36.8) of cases would result in under-protection of trait modalities despite protecting species composition (in terms of Jaccard's Index). This under-protection of trait modalities is only because of the different spatial scales that community structure and the traits were considered. We recommend that where the protection of biological traits, ecosystem functions or ecosystem services from stressors is a management goal, protective targets should not be solely set using measures of community structure such as SSDs or RSR. To protect both structural and functional attributes separate risk assessments should be done.
机译：生态风险评估主要考虑跨较大空间尺度的社区组成（结构）的度量。这些使用物种敏感性分布（SSD）或相对物种保留（RSR）进行的评估可能无法在较小的空间尺度上保护生态系统功能和服务。在这里，我们研究了在精细的空间尺度上作为生态系统功能/服务的代理的生物特征的变化如何与更大范围的结构评估相关。我们使用澳大利亚东南部两个栖息地（浅滩和边缘/池塘）中溪流昆虫物种的功能性状。我们发现，针对多个地点的物种中95％的物种防止盐度（如电导率）和浊度的不利影响，保护群落结构将主要但并非总是能在较小规模上保护性状。考虑到性状方式，污染物和栖息地的不同组合，尽管保护了物种组成（根据雅卡德指数），但平均17.5％（范围为0％-36.8）的病例仍会导致性状方式的保护不足。这种对特质方式的保护不足只是因为考虑了社区结构和特质的不同空间尺度。我们建议在以保护生物特征，生态系统功能或生态系统服务免受压力为管理目标的情况下，不应仅使用诸如SSD或RSR之类的社区结构措施来设定保护目标。为了保护结构和功能属性，应分别进行风险评估。

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