The SIGNAL manual - CeRDI
Above 5.5 Suggests toxic pollution or poor habitat Suggests good habitat and water quality Bug types found that are not on list: Below 5.5 Suggests pollution Suggests high salinity or nutrient levels (may be natural) Total No. of bug types found = 0 - 7 More than 7 Number of bug types 33 35 Checklist for macro-invertebrate sampling ................
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