Benthic survey of the Waiau Arm to determine the distributional extent of Didymosphenia geminata / Donna Sutherland, Barry Biggs, Neil Blair, Nelson Boustead, Greg Kelly, Julian Sykes.

Contributor(s): Sutherland, Donna L. (NIWA. Christchurch) | Biggs, Barry John Franklyn. (NIWA. Christchurch) | Blair, Neil. (NIWA. Alexandra) | Boustead, Nelson. (NIWA. Christchurch) | Kelly, G. (Gregory R.). (NIWA. Christchurch) | Sykes, Julian. (NIWA. Christchurch) | Biosecurity New Zealand.
Material type: materialTypeLabelBookSeries: NIWA Project ; MEL06505.NIWA client report: CHC2005-118Publisher: [Wellington, N.Z.] : MAF Biosecurity New Zealand, 2005Description: 13, 9 p. : maps ; 30 cm.Subject(s): DIDYMOSPHENIA GEMINATA | RESEARCH PROJECTS | BENTHIC ALGAE | BIOLOGICAL INVASIONS | DIATOMS | SURVEYS | RIVERS | WAIAU RIVER (SOUTHLAND) | SOUTH ISLAND | LAKES | LAKE MANAPOURIHoldings: Electronic Online resources: Click here to access online | Click here to access online Abstract: The Waiau Arm flow cap model was validated in Aug 2005, when didymo frustules entering the Waiau Arm as a result of water diversions from the Mararoa River were found by NIWA to have settled out of the water column and deposited on the bed of the Arm channel predominantly in Zone 1 near the MLC. A repeat survey in Dec 05 after the diversion of Mararoa water was suspended for four months showed that 99% of the didymo sampled was dead, compared to 25% dead in the Aug 05 survey. (MAF Biosecurity New Zealand thanks Meridian Energy for funding this work.)
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1 Not for loan 145603-2001

"September 2005"

"Prepared for Meridian Energy, Biosecurity New Zealand"

The Waiau Arm flow cap model was validated in Aug 2005, when didymo frustules entering the Waiau Arm as a result of water diversions from the Mararoa River were found by NIWA to have settled out of the water column and deposited on the bed of the Arm channel predominantly in Zone 1 near the MLC. A repeat survey in Dec 05 after the diversion of Mararoa water was suspended for four months showed that 99% of the didymo sampled was dead, compared to 25% dead in the Aug 05 survey. (MAF Biosecurity New Zealand thanks Meridian Energy for funding this work.)

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