Evidence details
28 Apr 2020
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Study
- Citation
- Tester, A (2020). Made up title. Made up journal.
- Study description
- comparison of primary production up stream and downstream of two dams on two regulated rivers
Response
- Cause term/trajectory
-
Hydrology - surface flow (velocity)
(Increase)
- Cause description
- Water velocity was higher downstream of the dam than in the tail waters of the weirpools where the upstream samples were taken.
- Effect term/trajectory
-
Ecosystem function - gross/net primary production
(Decrease)
- Effect description
- Gross primary production, as measured using the BASE method employing in situ oxygen probes
- Response measure type
- F statistic/ratio
- Response measure value
- 4.5
- Statistical significance
- p value of null hypothesis test 0.02 with 1, 2 degrees of freedom
- Documentation
- p value cited in text. Graphs of mean response at each site also shown.
- Response measure description
- 1 way ANOVA.
Design
- Source data
- Field
- Study type
- Observation
- Study design
- Control/reference vs. treatment/impact (no before)
- Number of independent control or reference sampling units
- 4
- Number of indendent impact or treatment sampling units
- 2 impact (downstream) and 2 control (upstream) units
- Sample size used in analysis
- 4
- Design description
- There were multiple samples over time, but for the test of the hypothesis of no effect from upstream to downstream, these were averaged within the ANOVA.
Context
- Climate
- Temperate
- Country
- Australia
- Habitat
- Stream/river
- Spatial extent
- Drainage basin
- Temporal extent
- Months
- Context description
- Samples taken monthly over 1 year at the four sites. 2 rivers in NSW, the murrumbidgee and the lachlan, both within the Murray-Darling Basin