THE IMPORTANCE OF BIOLOGICAL MONITORING FOR THE ECOLOGICAL RISK ASSESSMENT OF FRESH-WATER POLLUTION - A CASE-STUDY

被引：35

作者：

CAMARGO, JA

机构：

[1] CBS, O'Donnell 32

来源：

ENVIRONMENT INTERNATIONAL | 1994年 / 20卷 / 02期

关键词：

D O I：

10.1016/0160-4120(94)90140-6

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A comparative study of the organic pollution generated by trout farm effluent on its downstream ecosystem was conducted in the middle reaches of a Galician stream within the province of Lugo (northern Spain). Physicochemical and biological surveys were undertaken during the spring of 1988. The physicochemical monitoring showed a slight pollution. Total hardness, water temperature, dissolved oxygen, nitrate, organic matter, sulfate, sodium, pH, and chloride exhibited similar values along the study area, whereas concentrations of total phosphorus increased significantly downstream from the fish farm outlet. In contrast, the biological monitoring (based on benthic macroinvertebrates) showed more important pollution, diversity, biotic, and similarity parameters decreasing markedly downstream from the trout farm. In addition, the pristine trophic structure of the macrobenthic community was altered: scrapers and shredders being the macroinvertebrate functional feeding groups most adversely affected by the fish farm effluent. This difference in pollution degree between the physicochemical monitoring and the biological monitoring was probably due to the reduction in the carrying capacity of the trout farm and the decrease in the trout feeding during the period of the field survey. It is concluded that both physicochemical and biological monitorings are needed for proper ecological risk assessment of freshwater pollution in order to provide the maximum information for adequate protection of aquatic ecosystems.

引用

页码：229 / 238

页数：10

共 40 条

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