La Trobe
32985_ATTACHMENT01_2_A.pdf (1.13 MB)
Download file

Objective derivation of macroinvertebrate family sensitivity grade numbers for the SIGNAL biotic index: Application to the Hunter River system, New South Wales

Download (1.13 MB)
journal contribution
posted on 2023-03-23, 12:17 authored by Bruce C Chessman, Jane E Growns, Amanda R Kotlash
MDFRC item.

Chessman's SIGNAL-95 biotic index was modified on the basis of data from spring and autumn surveys of macroinvertebrates at 42 sites in the Hunter River and tributaries. An iterative algorithm was used to derive improved grade numbers reflecting the pollution sensitivities of individual families of river macroinvertebrates. The new grades were used to calculate values of the modified index (SIGNAL-HU97). These values were highly correlated with SIGNAL-95 values but were more widely spread, giving better discrimination between the sites of higher environmental quality and the more degraded sites. SIGNAL-HU97 values were also more highly correlated than were SIGNAL-95 values with environmental variables such as the conductivity of the water and a riparian, channel and environmental inventory. There was little difference in values between spring and autumn, but riffles consistently had higher mean values than other habitats.


Publication Date



Australia CSIRO.

Data source

arrow migration 2023-03-02 18:17. Ref: 25aacc. IDs:['', 'latrobe:32985']

Usage metrics

    Journal Articles


    No categories selected