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Basslink Monitoring Program Field Report : Gordon River Macroinvertebrates


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Davies, PE ORCID: 0000-0003-2651-4061 and Cook, LSJ 2006 , Basslink Monitoring Program Field Report : Gordon River Macroinvertebrates.

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Macroinvertebrates were sampled in autumn (March) 2006 at nine sites in the Gordon River between the Gordon power station and the Franklin River junction. All six reference sites were sampled in the Franklin, Denison, Maxwell and Jane Rivers. Sampling was conducted as required under the Basslink Monitoring Program, with all sites sampled using:
- Quantitative surber samplers with 10 sample units taken per site placed randomly in mid-riffle habitats;
- Rapid bioassessment (RBA) kick sampling, with live-picking on-site.
The former samples were used to generate data on abundances of individual taxa, total abundances and diversity (as number of taxa). The latter samples were used to derived O/E values for each site, using the combined RIVPACS models developed by Davies et al. (1999) and single season models developed by Davies (unpub. rep.) for Tasmanian Hydro catchments.
Patterns and trends in diversity and O/E values were similar to those observed in 2001/02, 2003/03, 2003/04 to 2004/05 with:
- Number of taxa increasing from low levels with distance downstream of the power station;
- O/E values increasing with distance from the power station, with values upstream of the Denison River falling significantly below reference values;
- O/Epa values being significantly higher upstream of the Denison, suggesting an increase in the diversity of common (expected) families since spring 2005.
Data collected in this survey will form part of the database used to assess changes in instream conditions associated with changes in flow regimes resulting from Basslink.
Analysis of all macroinvertebrate monitoring data to date indicates no statistically significant or substantial change in the overall pattern of diversity or total macroinvertebrate abundance between years 1 and 5 of monitoring.

Item Type: Report (Technical Report)
Authors/Creators:Davies, PE and Cook, LSJ
Keywords: Tasmania, streams, freshwater, biota, macroinvertebrates, hydro, Basslink, Gordon River, Franklin River, power station
Publisher: Freshwater Systems
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