https://padlet.com/abby_guggisberg/cx3jnqwvz7ys For the grade bump en-us 2017-05-23 12:28:30 UTC 2017-06-05 21:16:39 UTC hello@padlet.com abby_guggisberg https://padlet.com/abby_guggisberg/cx3jnqwvz7ys/wish/173368448 Abby Guggisberg]]> 2017-05-23 12:36:53 UTC https://padlet.com/abby_guggisberg/cx3jnqwvz7ys/wish/173368448 abby_guggisberg https://padlet.com/abby_guggisberg/cx3jnqwvz7ys/wish/173368920 The students explored the interactions of aquatic organisms and how those interactions were affected by the salinity of the water they were placed in. The three groups included the control, one with a middle range on salt in the water, and one with a high level of salt for a normal non-saline water environment. It was found springwater is the most preferred environment, although there was not a major difference in the salt water concentration groups by comparison. ]]> 2017-05-23 12:38:50 UTC https://padlet.com/abby_guggisberg/cx3jnqwvz7ys/wish/173368920 abby_guggisberg https://padlet.com/abby_guggisberg/cx3jnqwvz7ys/wish/173369050 Control: Springwater
Independent: Salt concentration
Dependent: Dissolved oxygen levels
Constants: temperature, volume of water, light]]> 2017-05-23 12:39:24 UTC https://padlet.com/abby_guggisberg/cx3jnqwvz7ys/wish/173369050 abby_guggisberg https://padlet.com/abby_guggisberg/cx3jnqwvz7ys/wish/174659138 Use 3 DO bottles. One for the control, one for the springwater, one fore the 100 mg/L, and one for the 200 mg/L salt concentrations. Fill them slowly, by tipping and slowly submerging the bottles under the surface of the water, making sure there is no extra air in the bottle before capping it off. Use the Winkler Method Protocol to determine the DO values of each sample and then tritrate the previously fixed solution. The Winkler Method and tritration both employ the use of hazardous chemicals if not handled carefully and if used without goggles, aprons, and gloves.]]> 2017-05-31 16:31:34 UTC https://padlet.com/abby_guggisberg/cx3jnqwvz7ys/wish/174659138 abby_guggisberg https://padlet.com/abby_guggisberg/cx3jnqwvz7ys/wish/175141784 We explored many options for the inquiry experiment and settled on water salinity because it is having a direct impact on the current freshwater aquatic environment. The main goal was to explore the effects of salt concentration in the water on the dissolved oxygen levels through the cellular respiration of the aquatic organisms.]]> 2017-06-04 23:39:10 UTC https://padlet.com/abby_guggisberg/cx3jnqwvz7ys/wish/175141784 abby_guggisberg https://padlet.com/abby_guggisberg/cx3jnqwvz7ys/wish/175151311 How does higher water salt content affect the dissolved oxygen levels in samples with aquatic organism cultures?]]> 2017-06-05 01:58:22 UTC https://padlet.com/abby_guggisberg/cx3jnqwvz7ys/wish/175151311 abby_guggisberg https://padlet.com/abby_guggisberg/cx3jnqwvz7ys/wish/175151491 There was a very minor difference found in the salt concentrations. The springwater and 100mg/L dissolved oxygen levels were the same, with 1.20 ppm. The 200 mg/L sample was only 0.05 ppm more, at 1.25 ppm. The data was analyzed using the standard error of the mean, and is summarized in tables and graphs.]]> 2017-06-05 02:00:42 UTC https://padlet.com/abby_guggisberg/cx3jnqwvz7ys/wish/175151491 abby_guggisberg https://padlet.com/abby_guggisberg/cx3jnqwvz7ys/wish/175152697 2017-06-05 02:16:46 UTC https://padlet.com/abby_guggisberg/cx3jnqwvz7ys/wish/175152697 abby_guggisberg https://padlet.com/abby_guggisberg/cx3jnqwvz7ys/wish/175152841 CER:
The salt concentration of the water has relatively little effect on the dissolved oxygen levels of the samples. This is seen in the very similar DO levels, measured in ppm. Because of this, it is reasonably inferred that the salt concentration of the water in the tested amounts has a negligible effect on the DO levels.

This experiment is particularly interesting to do right now because freshwater lake salinity is on the rise. At this rate, it could kill many freshwater aquatic organisms. Because of this, it is somewhat comforting to observe that there is a good cushion right now, and that there is still time to change the effects on the lakes.

Some follow up questions that I had are things like what causes the increase in water salinity? What if a different organism was used? How would that affect the DO levels and how would the salinity affect that organism? ]]> 2017-06-05 02:18:42 UTC https://padlet.com/abby_guggisberg/cx3jnqwvz7ys/wish/175152841