Oliveira S V, Cortes R M V
Departamento Florestal, Universidade de Trás-os-Montes e Alto Douro, Apartment 1013, Vila Real, Portugal.
Environ Monit Assess. 2006 Jan;112(1-3):93-113. doi: 10.1007/s10661-006-0766-5.
This work represents an attempt to define a simple method to classify the relative degree of disturbance of sites in lotic systems on the basis of comparison of their faunistic composition with reference sites. Two ecotypes were selected in northern Portugal where benthic invertebrates were sampled in reaches with different levels of contamination. As a first stage, previous Geographic Information System information was used to define reference sites in each ecotype. Afterwards, multivariate techniques and non linear estimation models were combined to assess biological quality. This method allowed us to quantify sites according to increasing levels of contamination, after the probabilities of occurrence of taxa along a gradient of contamination taking into account the reference condition. The results suggest that this method is sensitive to organic pollution, easy to interpret, namely the species tolerance, and could be a good framework to establish regional rankings depending on the ecological impact of river sites.
这项工作旨在尝试定义一种简单的方法，通过将流水系统中各地点的动物群落组成与参考地点进行比较，来分类这些地点受干扰的相对程度。在葡萄牙北部选择了两种生态型，在不同污染水平的河段采集底栖无脊椎动物样本。作为第一阶段，利用先前地理信息系统的信息在每种生态型中定义参考地点。之后，将多变量技术和非线性估计模型相结合来评估生物质量。考虑到参考条件，根据污染梯度上分类单元出现的概率，该方法使我们能够根据污染程度的增加对各地点进行量化。结果表明，该方法对有机污染敏感，易于解释，即物种耐受性方面，并且可能是一个很好的框架，可用于根据河流地点的生态影响建立区域排名。
