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Basslink Monitoring Program Field Report : Gordon River Benthic algae and moss. Spring and Autumn 2006/07


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Davies, PE ORCID: 0000-0003-2651-4061 and Cook, LSJ 2007 , Basslink Monitoring Program Field Report : Gordon River Benthic algae and moss. Spring and Autumn 2006/07.

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Benthic algae were surveyed in spring (October) 2006 and autumn (March) 2007 at nine sites in the Gordon River between the Gordon power station and the Franklin River junction, and three reference sites. The survey was conducted as required under the Basslink Monitoring Program, with all sites assessed by:
- Surveying across the river channel at existing fixed transect locations from bank to bank, where conditions permitted wading access;
- Estimating % algal cover at 3 locations at 2.5 m intervals within each of up to nine mesohabitats or ‘zones’, characterised by benthic substrate composition, across each transect;
- Preserving representative (non-quantitative ’scrape’) samples of dominant algae from within each transect zone.
Patterns and trends in algal cover were broadly similar to those observed in previous years.
- Aquatic flora having a consistently low to moderate cover across all sites;
- Spring values being higher than autumn values;
- Moss and filamentous algae having low overall mean % cover across all sites;
- Filamentous algae being low and locally variable in abundance;
- Mean moss cover being highly variable, but highest at site 74;
- Macrophytes occurring at site 72 at low densities.
Filamentous algal cover was low throughout, especially in autumn, with reduced levels at sites downstream of the Denison junction, suggesting that a Basslink effect should be watched for in years 2 and 3.
Data was also collected at reference sites, though not in autumn due to scheduling problems, for ongoing interpretation and benchmarking. Sampling at these sites was conducted by random placement of quadrats on the dominant channel substrate at 30 locations.
Data collected in this survey forms part of the database used to assess changes in instream conditions associated with changes in flow regimes resulting from Basslink.

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