| responses of aquatic organisms to metal pollution in a lowland river in flanders: a comparison of diatoms and macroinvertebrates. | the role of macroinvertebrates and diatoms as indicator for metal pollution was investigated by assessing both biota along a metal gradient in the belgian river the dommel. macroinvertebrates and diatoms were sampled in summer and winter and physical-chemical characteristics of the water were measured at four different sample periods and related to sediment characteristics. although metal concentrations, except cadmium, in the water nowhere exceeded water quality standards, high metal concentrat ... | 2008 | 18778849 |
| application of artificial neural network models to analyse the relationships between gammarus pulex l. (crustacea, amphipoda) and river characteristics. | this study aimed at analysing the relationship between river characteristics and abundance of gammarus pulex. to this end, four methods which can identify the relative contribution and/or the contribution profile of the input variables in neural networks describing the habitat preferences of this species were compared: (i) the "pad" ("partial derivatives") method consists of a calculation of the partial derivatives of the output in relation to the input variables; (ii) the "weights" method is a ... | 2005 | 16311829 |
| overview and quantification of the factors affecting the upstream and downstream movements of gammarus pulex (amphipoda). | human activities have severely deteriorated the flemish river systems, and many functions such as drinking water supply, fishing, ... are threatened. because their restoration entails drastic social (e.g. change in habits with regard to water use and discharge, urban planning) and economical (e.g. investment in nature restoration, wastewater treatment system installation) consequences, the decisions should be taken with enough forethought. ecosystem models can act as interesting tools to support ... | 2003 | 14696234 |