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Basslink Review Report 2006-12 Gordon River Basslink Monitoring Program : May 2013 [Davies authored Chapter 8 Benthic macroinvertebrates, algae and moss and contributed two other chapters]

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Hydro Tasmania, and Davies, PE (2013) Basslink Review Report 2006-12 Gordon River Basslink Monitoring Program : May 2013 [Davies authored Chapter 8 Benthic macroinvertebrates, algae and moss and contributed two other chapters]. Project Report. Hydro Tasmania, Hobart.

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Abstract

Executive Summary: This report evaluates the Gordon River Basslink Monitoring Program after six years of Basslink
operations (2006-2012). The report presents trends from the consolidated data, evaluates the
adequacy of the monitoring program, and evaluates the appropriateness and effectiveness of
triggers and the mitigation measures.

Chapter 8 - Benthic macroinvertebrates, algae and moss:
Most benthic macroinvertebrate indicators did not show a major change between pre- and post-
Basslink periods. There were significant post-Basslink changes in some macroinvertebrate
indicators, most of which may be considered positive Basslink-related impacts. The changes
identified are consistent with the conceptual model, with trigger exceedances being generally a
positive response to the post-Basslink minimum environmental flow mitigation measure.
Lagged responses to post-Basslink minimum flow conditions were detected in several
macroinvertebrate indicators, mainly due to increases in abundance of several EPT taxa, which
may take several generations (i.e. 2-3 years) to occur. These upward trends have led to
exceedances for some triggers with time. These exceedances all represent improvements in
overall condition of macroinvertebrate communities.
Filamentous algal and benthic moss cover varied both between zones in the Gordon River and
with time. None of these changes are of substantive ecological concern, and no substantive
trigger exceedances were observed after Basslink operations commenced.

Item Type: Report (Project Report)
Publisher: Hydro Tasmania
Additional Information:

© Hydro Tasmania 2013, © Freshwater Systems 2013

Date Deposited: 04 Jul 2014 05:50
Last Modified: 18 Nov 2014 05:02
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