BDBSA Project Metadata Detail

Survey/Project Number: 376          Total No. of Sites: 0
Survey/Project Name: Invertebrate monitoring AUSRIVAS
Abstract: This project aimed to assess the impacts of lower lake water levels on invertebrates, in Lake Alexandrina and the tributary channels. Good baseline data was collected in 2003, including several invertebrates that had never been collected before. However the duration of the study was only six months, which was not long enough to determine whether water levels have anything to do with invertebrate numbers. The AUSRIVAS survey methods were used at four sites that were GPS located and sampled monthly for six months. Data collected included species, number of taxa and water chemistry.
 
Start Date: 01/02/2003      End Date: 01/07/2003
Survey Type: Land Resource Inventory
   
Study Area Description: *** No study area description recorded
Objectives
         Vegetation: *** No vegetation survey objectives recorded
         Fauna: From February to July, 2003 macroinvertebrate samples were collected from four sites in the lower Murray River and Lake Alexandrina region to determine the effects of low water levels on macroinvertebrate community structure. The four sites investigated were Wyndgate Channel on Hindmarsh Island, Clayton Lagoon, Milang and Walker Flat. Samples were collected by the Department for Environment and Heritage and delivered to the Australian Water Quality Centre for identification and analysis. The macroinvertebrate data was assessed using the autumn edge AusRivAS computer predictive model and multivariate statistical techniques. Samples were collected according to the AusRivAS (Australian Rivers Assessment System) sampling protocol which involves sampling a 10m stretch of river using a dipnet with a 250 micron mesh. Samples were initially preserved with 75% ethanol in the field, with formalin being added to the samples once they had been delivered to the Australian Water Quality Centre. Conductivity, pH, dissolved oxygen, water temperature and turbidity were recorded at all sites at the time of sampling. Macroinvertebrate samples were collected at four sites on a monthly basis from February to July 2003. From the 24 samples collected in this study a total of 114 macroinvertebrate taxa were identified. Dipterans (true flies) were the most diverse group of organisms collected with 26 different taxa recorded. Ten taxa each of caddis flies, true bugs and crustaceans and eight aquatic beetle species were collected. The highest number of taxa collected in any one sample was at Milang in February with a total of 36 collected. The lowest number of taxa (19) was collected from Clayton Lagoon in June. Six species of fish and 22 zooplankton taxa were collected during the study.
Methodology
         Vegetation: *** No vegetation methodology recorded
         Fauna: *** No vertebrate methodology recorded

Data Distribution Rules: Public
Project Basis: Fauna : Fauna species/population Study (ie trapping records over time period for species study). NOTE:NON Std Svy methodology may have been used.
Information Authority: Department for Environment and Heritage (BDBSA:South East) - Mt Gambier Office - Regional Ecologist