Measuring the ecological integrity of an industrial district in the Amazon estuary, Brazil

The aim of the present study is to provide information on the ecological integrity of an industrial district located in the estuary of Pará River (Amazon estuary), by applying a selection of fish based multimetric indices of ecosystem integrity: Abundance Biomass Comparation (ABC); Biological Health Index; Estuarine Fish Community, Transitional Fish Classification and Estuarine Biotic Integrity Indexes. To evaluate the impacts of the industrial area and cargo terminal, three areas were considered: Zone 1, (maximum impact), Zone 2 (median risk) and Zone 3 (reference area). All the biological indices used were considered to be excellent indicators of the ecological integrity of the different sectors of the study area and were especially effective for the demonstration of the critical alterations of the fish community of Zone 1 and Zone 2. The simultaneous use of diferents indices family, with diferente assumptions, did strengthen the results enhancing the confidence in the diagnostic.

► The lowest BHI value was recorded in the Zone 1, closest to the industrial district. ► The ABC curve indicated moderate disturbance in the Zone 1. ► Integrity indices ranging from bad to excellent. ► The zone closest to the industrial district (Zone 1) is the most impacted.