A probabilistic model characterizing fish assemblages of French rivers: a framework for environmental assessment
A probabilistic model characterizing fish assemblages of French rivers: a framework for environmental assessment
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描述法国河流鱼类组合的概率模型：环境评估框架
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
D. Chessel
中科院分区：
文献类型：
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作者：
T. Oberdorff;D. Pont;B. Hugueny;D. Chessel
摘要1.流动沃茨的管理和水质趋势的评估需要使用生物方法。在可能的指标中，鱼类组合特别令人感兴趣，因为它们能够在不同的空间尺度上综合环境变异性。2.法国水务局和环境部启动了一个研究方案，以制定一个适用于全国的鱼类指数。这种指数应包括影响河流鱼类分布的地理、生态区域和当地因素的相对重要性。3.一个有效的方法是使用从鱼类组合的信息，以建立这样一个指数是通过使用的'参考条件的方法'，其中涉及测试的鱼组合暴露于潜在的压力，对一个参考条件是未暴露于这种压力。4.逻辑回归程序，使用650个参考点的鱼类数据集相当均匀地分布在法国河流和一些容易测量的区域和地方特征的定义，阐述了最简单的可能的响应模型，充分解释了观察到的模式发生在任何给定的河流的一个给定的网站的每种鱼的组合。这使我们能够预测在一个网站的“理论”组合。5.使用第二个独立的数据集88个参考网站的模型进行了验证。使用第三个数据集的88个干扰网站，观察到的组合，然后与参考条件所定义的“理论”组合进行比较。这些地点内预期和观察到的组合之间的偏差量被用作退化的量度。6.这种方法可以被用来作为一个框架，用于调整和校准的多指标，从而作为一个实用的技术参考进行成本效益的生物评估的lotic系统。
SUMMARY 1. Management of running waters and assessment of water quality trends require the use of biological methods. Among potential indicators, fish assemblages are of particular interest because of their ability to integrate environmental variability at different spatial scales. 2. The French Water Agencies and the Ministry of the Environment initiated a research programme to develop a fish-based index that would be applicable nation-wide. Such an index should encompass the relative importance of geographic, ecoregional and local factors influencing the distribution of riverine fishes. 3. An effective way of using the information available from fish assemblages to establish such an index is through the use of the ‘reference condition approach’ which involves testing a fish assemblage exposed to a potential stress against a reference condition that is unexposed to such a stress. 4. Logistic regression procedures were applied, using a fish data set of 650 reference sites fairly evenly distributed across French rivers and defined by some easily measured regional and local characteristics, to elaborate the simplest possible response model that adequately explains the observed patterns of occurrence for each species of a fish assemblage at a given site of any given river. This allows us to predict a ‘theoretical’ assemblage at a site. 5. The models were validated using a second independent data set of 88 reference sites. Using a third data set of 88 disturbed sites, the observed assemblages were then compared against the reference condition as defined by the ‘theoretical’ assemblages. The amount of deviation between the expected and observed assemblages within these sites is used as a measure of degradation. 6. This approach could be used as a framework for adapting and calibrating a multimetric index, thereby serving as a practical technical reference for conducting costeffective biological assessments of lotic systems.