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Title: Biofilm and flow regimes: developing a biological monitoring program for the Nymboida River, northern NSW
Contributor(s): Warner, Emilie  (author); Ryder, Darren  (author); Boulton, Andrew  (author); Downes, Barbara (author)
Publication Date: 2007
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Abstract: A well-designed monitoring program is critical for determining the extent of human impacts and the effectiveness of restoration activities in aquatic ecosystems. This project considers the Nymboida River, northern NSW, as a case study for developing a biological monitoring program. Water extraction from the Nymboida weir pool alters the flow regime to downstream habitats. Algal biofilms, which respond to local hydraulic conditions, are used in this project as biological indicators of response to the altered flow regime downstream of the weir. Longitudinal change on the Nymboida (the difference in biofilm assemblage attributes between upstream and downstream of the weir) was compared with longitudinal change on 'reference' rivers (rivers that do not have a weir and represent the desired condition for the Nymboida given current water and land-use constraints). This design allows us to determine if longitudinal change in biofilm on the Nymboida is greater than what we would generally find on equivalent rivers without a weir. The high variability in biofilm attributes (algal composition, biofilm mass, organic matter content and chlorophyll a at monitoring sites is assessed up-front in the design of the monitoring program so that optimum levels of sample replication can be determined. This will ensure that resources can be allocated efficiently while still providing enough information for managers to make informed decisions.
Publication Type: Conference Publication
Conference Details: 5ASM 2007: 5th Annual Australian Stream Management Conference, Thurgoona, Australia, 21st - 25th May, 2007
Source of Publication: Proceedings of the 5th Australian Stream Management Conference - Australian rivers: making a difference, p. 419-424
Publisher: Charles Sturt University
Place of Publication: Online
Fields of Research (FoR) 2008: 060204 Freshwater Ecology
Socio-Economic Objective (SEO) 2008: 960506 Ecosystem Assessment and Management of Fresh, Ground and Surface Water Environments
Peer Reviewed: Yes
HERDC Category Description: E1 Refereed Scholarly Conference Publication
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Appears in Collections:Conference Publication

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