UBC Undergraduate Research

Relationship Between Stream Discharge and Dissolved Oxygen Levels at Canyon Creek, and Implications Towards… Dou, Bowen; Hosseini, Yalda; Lee, ChaeEun; Rosenberg, Crista; Wu, Nicholas 2019

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Relationship Between Stream Discharge and Dissolved Oxygen Levels at Canyon Creek, and Implications Towards Salmon Development and PhysiologyINTRODUCTIONStream discharge= velocity*water depth*wetted widthDissolved oxygen refers to the level of free oxygen present in water and plays a role in salmon development and physiological  function. 2Purpose: To determine if there is a relationship between stream discharge and dissolved oxygen levels.HYPOTHESESMETHODSPREDICTIONRipple sites O2   > still sites O2 due to constant O2 replenishment with constant flowHYPOTHESIS 2 O2  O2 HYPOTHESIS1                          RESULTS DISCUSSION•The difference in oxygen levels and stream discharge between ripple and still sites is significant, as well as the positive correlation between oxygen and stream discharge levels (null hypothesis rejected)•In slow-flowing sites (still), oxygen levels are depleted due to decomposition and consumption by the organisms that inhabit the stream. In faster-flowing water sites (ripple), oxygen levels get replenished, as the water has more contact with air.3•A previous study found that higher oxygen levels→ higher embryonic survival rates.4(minimum  of 7 mg/L).•The study also found correlation between water velocity, embryonic survival and dissolved oxygen levels. Higher stream discharge→ higher dissolved oxygen→ higher embryonic survival.4•Decrease in salmon population → less trophic productivity and less food for consumers of salmon.5CONCLUSION & FUTURE DIRECTIONS•For future studies: take into account other environmental factors that can also influence oxygen levels, such as water temperature, gravel composition, water murkiness, etc.5, use more precise equipment, and obtain larger sample size.•These findings can allow us to determine if a stream has adequate conditions for optimal salmon performance and reproduction.ACKNOWLEDGEMENTSWe acknowledge that the land on which we gathered our data was on the traditional, ancestral, and unceded territory of the xwməθkwəy̓əm (Musqueam). We thank UBC for funding our research and providing the opportunity to take  Biology 342. This work was done with a permit from the Vancouver Park Board, to whom we show our thanks. Thanks to Dr. Celeste Leander for providing insight and guidance on our research. We also thank teaching assistants Tessa Blanchard and Mindy Chow at UBC for providing assistance.Bowen Dou1, Yalda Hosseini1, ChaeEun Lee1, Crista Rosenberg1, Nicholas Wu1                                                                                         1University of British ColumbiaFigure 1. Mean oxygen levels (mg/L) at still water and ripple water sites (n=6). Figure 2.  Mean stream discharge (m3/s) at still water and ripple water  sites (n=6). Figure 3. Correlation between oxygen levels (mg/L) and stream discharge (m3/s) (xn=6). **Measure dissolved oxygen levelsStep 1Measure stream velocity using Pooh Sticks MethodStep 2Measure stream cross-sectional area (average of wetted depth at 0.3 meter increments * wetted width)Step 3


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