Abstract
The practical application of the nematode/copepod ratio in a pollution monitoring study in the Firth of Forth was investigated. Ratios from polluted sites were much higher than from a clean site, but there is considerable evidence which casts doubt on the credibility of the ratio as a tool to detect organic pollution. Nematodes and copepods exhibited differing degrees of contagion. Seasonal patterns of variation of the ratio were shown to vary geographically and at some sites the seasonal range was great. Along sewage pollution gradients in time and space the ratio was shown to vary in an inconsistent manner. A possible improvement to the ratio whereby only interstitial forms are included is suggested.
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