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Figure 1. Idealized depiction of pH cycling during a 3-day period in two ponds. In both ponds,
pH rises during the day as carbon dioxide is removed through photosynthesis and falls at
night (shaded vertical bars) as carbon dioxide is added to the water through respiration. The
solid line represents pH changes in a pond where carbon dioxide taken up in photosynthesis
is offset by carbon dioxide respired at night. The dashed line represents pH changes in a
pond where more carbon dioxide is fixed in photosynthesis than is produced at night, and pH
values increase from day to day.