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Photosynthesis during the day and respiration at night by phytoplankton can result in major changes in oxygen concentrations in the metalimnion. Next weekend we’ll hope to do both a mid-day sample and a night-time sample to get a better comparison of what actually happens at West Hill Pond in high summer.
Very cool graph – can’t wait to run this by my students. So much ecology and earth science is taught at the macro scale, it’s nice sometimes to make them focus on the details!