Gretas Bio Blog

   Week 1, September 7  Week 2, September 21 Week 3, October 12  Week 4, November 2 Week 5, November 19

  Fifth Encounter 11/19/25 Pictures Willow trees                                                      Brush next to river                             Macatawa River  Leaves caught in dead tree over river          Macatawa river and riverbank               Me by the river  Experiment results   I am testing the amount of phosphorus in the Macatawa river and seeing if the levels could change  due to the change in temperature as the year progresses. This week the water temperature was  4 degrees Celsius(40 degrees Fahrenheit). I tested the water three times for Phosphorus and  each test showed a high level of Phosphorus, roughly 3-4 ppm. Compared to my previous test,  these sa...

 Fourth Encounter 11/2/2025   Pictures          Leaf buildup                                                                                 Macatawa River                                                                       Brush next to river                                Willow Tree  Experiment results   I am testing the amount of phosphorus in the Macatawa river and seeing if the levels could change  due to the change in temperature as the year progresses. This week...

Third Encounter: 10/12/2025 Pictures                                                             Branches and Willow Tree                               Macatawa River                                     Second Willow tree                                                                          Brush next to river                                              ...

   Second Encounter: 9/21/2025   Pictures:                   brush next to river                                                                 dead tree and brush by river                                           the river water                                .                                                       Willow tree and brush above river                       ...