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The Darwin-Daly Regional AUSRIVAS Models - Northern Territory

The Australian River Assessment Scheme (AUSRIVAS) was developed by the Cooperative 
Research Centre for Freshwater Ecology (Davies 2000; Simpson & Norris 2000) as a tool to 
assess the health of inland riverine environments using the resident macroinvertebrate 
community. The development of the first set of AUSRIVAS models for the Northern Territory 
(NT) began in 1994 and a final report on those territory-wide AUSRIVAS models was 
completed in 2002 (Dostine 2002). 
The first regional model in the NT was developed for the Darwin-Daly region and was based on 
genus-level macroinvertebrate identification (Dostine 2004). This higher (but more resourceintensive) 
level of taxonomic resolution, compared with standard family-level of identification 
usually adopted for AUSRIVAS models, was aimed at detecting changes to stream health. With 
the intention of reducing resources needed for identification of AUSRIVAS samples, a second 
model for the Darwin-Daly region was developed, based on family-level macroinvertebrate 
identification (Barlow & Lamche 2005). 
This manual details the procedures necessary to carry out a stream health assessment using the 
Darwin-Daly regional models based on genus or family-level identification. It also includes 
sections of the NT AUSRIVAS Sampling and Processing Manual originally developed by 
Lloyd & Cook (1998). 
The Darwin-Daly region genus-level model has been shown to be more sensitive to the 
detection of impact (Lamche & Fukuda, in preparation) and given adequate resources, is 
preferred to the family-level model.