1 2012-05-13 14.28.19.nef Published May 9, 2017 at 4608 × 3072 in Building Universal PCR Primers for Aquatic Ecosystem Assessments Rivers are home to a wide range of macroinvertebrate species. These are often used to assess water quality as many respond sensitively to anthropogenic stressors, like organic pollution, eutrophication or fine sediment influx.