Conclusion
In Environmental Statistics 2017-2018, we spent the majority of our time at the Rocky Creek research site. We visited other rivers including a couple in West Virginia, and a few others around the greater Charlottesville/Albemarle area, including Buck Mountain Creek and Wards Creek. At Buck Mountain and Wards Creek, we found evidence of mussels. We expanded our monitoring of these creeks by measuring benthic invertebrates, E Coli, phosphates, nitrates, flow rate, temperature, conductivity, turbidity, dissolved oxygen, biological oxygen demand, pH, and ammonium on a monthly basis. We used the grid method established last year to locate the mussels. The objective was to locate the mussels and ultimately determine their movement. We located and tagged approximately 30 mussels with the intent to track their movement. Perhaps the most fun thing we did was look for mussels! We spent most of the Fall days looking for mussels because they were on the surface and easy to find. During the winter days we spent most of our time organizing and collecting monthly data, but did not mark mussels. When we did our mussel count, there was so much data that it had to be divided into a two-day event. The first 50 meters of the creek was surveyed the first day, and the last 50 meters the second. We have completed the second year of a four year mussel tagging study sponsored by Brian Watson of The Virginia Department of Game and Inland Fisheries.
We located seven of the Vico Mussels at our Buck Mountain site. We have searched Piney Creek and one other section of Buck Mountain, finding no indication of mussels. We suggest next year, further searching at Buck Mountain should occur. We did not search Wards Creek this year for mussels. This year, we have found that the pH at Wards creek has been high, and the Benthic scores have been low. Perhaps there is some runoff coming from the farm located near Wards Creek causing these high and low levels.
As with any class, especially a class involving studying endangered mussels, there were many struggles and failures. Some of our struggles included: tagging and finding the mussels effectively, spotting the mussels, bringing all of the equipment (including lab quests), function of the equipment, turbidity readings (often many negative readings were recorded because the water was so clear that it was almost equal to the zero reading, and because we need to use the same vile for distilled water and the sample water), issues with water level, and having enough working waders. While some of these struggles were out of our control, in order to fix the water data issues under our control we suggest: being as organized as possible, make sure when calibrating the high number goes first and low number goes second and that the voltage reaches a stable number, communicating well with your peers, and always being prepared for the elements.
We also suggest in order to fix the mussel issues we had to wait at least 20 seconds before gluing the tag onto the mussels (to allow the surface to dry), and having a three separate teams when collecting mussel data: one team to find the mussels, one to tag them, and one to locate them. The optimal mussel finding team should have two people both in the river looking. One person should be ahead and the other behind using the scopes. The optimal tagging team should have four people. One person gluing the tags onto the mussels, one measuring them, another taking pictures of each tagged mussel, and one for writing the data down. The third team should contain three people to record the locations of the mussels. One person should be in the river following behind the mussel team. Two people should be on the shore, one taking the measurements from the downstream and upstream posts and taking compass angles, and the third person writing down the measurements.
We have also developed a program for identifying the mussel species by adding photographs of unidentified specimens to a database. This program will give a suggested identification for that mussel using percentages. All photographs are then sent to Brian Watson for positive identification before we enter the data into the state database.
Conclusion on P Value
We found, in general, that the p value for pH between Wards Creek and the other two creeks was significant. The pH of Wards Creek, however, was significantly higher than the other two creeks, with the exception of March 2018, where Bucks Mountain Creek was higher.
When calculating the p values for Nitrates and Conductivity between the three creeks, they were all insignificant.
The p values we found for turbidity varied, which we believe is due to experimental error. We had lots of trouble when calibrating the machines. In January between Buck Mountain and Rocky there was no significant difference, however in February, there was a significant difference, and Rocky Creek was higher. In March, Buck Mountain had a higher turbidity than Rocky Creek, and in April, Rocky had a higher turbidity than Buck Mountain. The turbidity of Rocky Creek was also higher than Wards Creek in February, however Wards Creek was higher in March. Between Buck Mountain and Wards Creek in February, Wards Creek was higher, however in March, Buck Mountain was higher. The p value was insignificant between Buck Mountain and Wards Creek in April 2018.
The only p values we took for temperature were in April 2018, between each of the three creeks. We found that between Wards Creek and Buck Mountain, as well as between Buck Mountain and Rocky Creek, Buck Mountain had a higher temperature. Between Rocky Creek and Wards Creek, Wards had the higher temperature.
The only significant p value for flow rate that we found was between Rocky Creek and Wards Creek in February of 2018. Similarly, the only significant p value we found between these two creeks for ammonia was in January.
In general, our phosphate values for Rocky Creek were much higher than both of the other creeks, with the exception of our April values between Rocky Creek and Wards Creek, where we found Wards to be higher. Wards was also higher than Buck Mountain in April. We believe that Rocky Mountain could have higher phosphate levels due to some sort of runoff in the water. This runoff could potentially be coming from the bridge that is close to our observation site.
For Dissolved Oxygen, the only two significant p values were found in January 2018, between Wards Creek and Rocky Creek, and Wards Creek and Buck Mountain Creek. We found Wards Creek to be lower for both of these.
For the month of February, Wards Creek tended to have higher values than Buck Mountain. It had significant p values for pH, turbidity, and BOD.
In conclusion our p values showed the following three traits: pH in Wards Creek tended to be high, phosphates in Rocky Creek tended to be higher, and turbidity tended to vary.
For our Benthic calculations, we came up with a ‘score’ for each set of collected data. The Benthic scores over the course of this year have ranged from a seven to a 12. The three lowest scores were Buck Mountain in March with a seven, Wards Creek in March with a seven and Wards Creek in January with an eight.
Benthic Conclusion
P Value Writeup
This evaluation is comparing the p values that our class calculated when comparing the data of the years 2016, 2017 and 2018 at Rocky Creek. We compared all of our data roughly a year apart. An example would be March 14th, 2016 in comparison to March 12th 2017. This data is important because it can show us how the health of the stream has changed over the past 3 years and whether there are any in environmental factors that are affecting the creek.
Temperature: Has no trend between 2017-18.
Nitrates: There were elevated nitrates in 2018 in the spring.
Phosphates: There was no significant phosphate data.
Ammonium: No trend
Ph (Comparing 2016, 17, 18): The pH had significant differences but there was no correlation with the year.
BOD: There were two values where it was higher in 2017.
Turbidity: We cannot react a conclusion because we believe the data collected was inaccurate. Turbidity probe was unreliable, many times we got negative readings or close to 0 because the water was essentially the same as the distilled water that we used to calibrate the probe.
Conductivity: There is no trend.
Flow Rate: No trend
DO: No trend
In summary the only variable that is sticking out to us is the Nitrate data. This past year 2018, the averages were bigger than the ones in the years past. This may be responsible do to the algae that we had found in Rocky Creek in the spring of 2018.
The overall conclusion is that if we were able to reintroduce mussels we would want to use buck mountain because the data we collected in that stream was the closest to their data. We also found a few mussels in Buck Mountain.
We want to also continue to take data on location. We want to also maybe look at investigating on working with the fish, maybe with a fish biologist. Also maybe some plankton or bacteria work.