A computer-based reappraisal of the Biological Monitoring Working Party scores using data from the 1990 river quality survey of England and Wales

The impact of climate-induced distributional changes on the validity of biological water quality metrics

“…The ASPT for the Odonata was calculated for each combination of latitude and time using the revised BMWP scores in Walley and Hawkes (1996). The simplifying assumption was made that all species present in a latitude-time combination were present throughout that combination.…”

“…This is then A"PT prediction and classification system (RIVPACS; Moss et al, 1987). Since the original scheme was designed, scores for each taxon have been revised in light of computer analyses by Walley and Hawkes (1996;1997), leading to a reduction in the uniformity of scores between same-order families.…”

Use of the aquatic protozoa to formulate a community biotic index for an urban water system

“…This may explain why the evaluation results with these indices often do not coincide with the actual situation. For this reason several papers presented objective methods for assigning pollution sensitivity values (Lawrence and Harris, 1979;Walley and Hawkes, 1996;Chessman et al, 1997). We present a new method of using the correlation of communities with chemical water quality and treat biotic data directly with chemical parameters in which these problems may be minimized.…”

Detecting Invertebrate Species Change in Running Waters: An Approach Based on the Sufficient Sample Size Principle

“…These qualities are used in many indices, included those which are preliminary selected as standards also for Norway: The Biological Monitoring Working Party (BMWP) score, and the derived average score per taxon (ASPT) [34][35][36]. These indices are mostly based on the presence/absence and/or range values of selected taxa with specific ecological demands.…”